Merge remote-tracking branch 'savannah/master' into HEAD

21 files changed, 1475 insertions, 80 deletions

diff --git a/test/data/syntax-comments.txt b/test/data/syntax-comments.txt
new file mode 100644
index 00000000000..6f595e4d8dc
--- /dev/null
+++ b/test/data/syntax-comments.txt
@@ -0,0 +1,68 @@
+/* This file is a test file for tests of the comment handling in src/syntax.c.
+   This includes the testing of comments which figure in parse-partial-sexp
+   and scan-lists.  */
+
+/* Straight C comments */
+1/* comment */1
+2/**/2
+3// comment
+3
+4//
+4
+5/*/5
+6*/6
+7/* \*/7
+8*/8
+9/* \\*/9
+10*/10
+11//  \
+12
+11
+13//  \\
+14
+13
+15/* /*/15
+
+/* C Comments within lists */
+59}59
+50{ /*70 comment */71 }50
+51{ /**/ }51
+52{ //72 comment
+73}52
+53{ //
+}53
+54{ //74 \
+}54
+55{/* */}55
+56{ /*76 \*/ }56
+57*/77
+58}58
+60{ /*78 \\*/79}60
+
+
+/* Straight Pascal comments (not nested) */
+20}20
+21{ Comment }21
+22{}22
+23{
+}23
+24{
+25{25
+}24
+26{ \}26
+
+
+/* Straight Lisp comments (not nested) */
+30
+30
+31; Comment
+31
+32;;;;;;;;;
+32
+33;        \
+33
+
+Local Variables:
+mode: fundamental
+eval: (set-syntax-table (make-syntax-table))
+End:
diff --git a/test/lisp/calc/calc-tests.el b/test/lisp/calc/calc-tests.el
index dce82b6f536..0df96a0e2db 100644
--- a/test/lisp/calc/calc-tests.el
+++ b/test/lisp/calc/calc-tests.el
@@ -458,6 +458,122 @@ An existing calc stack is reused, otherwise a new one is created."
                   (calcFunc-choose '(frac -15 2) 3))
                  (calc-tests--choose -7.5 3))))
 
+(ert-deftest calc-business-days ()
+  (cl-flet ((m (s) (math-parse-date s))
+            (b+ (a b) (calcFunc-badd a b))
+            (b- (a b) (calcFunc-bsub a b)))
+    ;; Sanity check.
+    (should (equal (m "2020-09-07") '(date 737675)))
+
+    ;; Test with standard business days (Mon-Fri):
+    (should (equal (b+ (m "2020-09-07") 1) (m "2020-09-08"))) ; Mon->Tue
+    (should (equal (b+ (m "2020-09-08") 1) (m "2020-09-09"))) ; Tue->Wed
+    (should (equal (b+ (m "2020-09-09") 1) (m "2020-09-10"))) ; Wed->Thu
+    (should (equal (b+ (m "2020-09-10") 1) (m "2020-09-11"))) ; Thu->Fri
+    (should (equal (b+ (m "2020-09-11") 1) (m "2020-09-14"))) ; Fri->Mon
+
+    (should (equal (b+ (m "2020-09-07") 4) (m "2020-09-11"))) ; Mon->Fri
+    (should (equal (b+ (m "2020-09-07") 6) (m "2020-09-15"))) ; Mon->Tue
+
+    (should (equal (b+ (m "2020-09-12") 1) (m "2020-09-14"))) ; Sat->Mon
+    (should (equal (b+ (m "2020-09-13") 1) (m "2020-09-14"))) ; Sun->Mon
+
+    (should (equal (b- (m "2020-09-11") 1) (m "2020-09-10"))) ; Fri->Thu
+    (should (equal (b- (m "2020-09-10") 1) (m "2020-09-09"))) ; Thu->Wed
+    (should (equal (b- (m "2020-09-09") 1) (m "2020-09-08"))) ; Wed->Tue
+    (should (equal (b- (m "2020-09-08") 1) (m "2020-09-07"))) ; Tue->Mon
+    (should (equal (b- (m "2020-09-07") 1) (m "2020-09-04"))) ; Mon->Fri
+
+    (should (equal (b- (m "2020-09-11") 4) (m "2020-09-07"))) ; Fri->Mon
+    (should (equal (b- (m "2020-09-15") 6) (m "2020-09-07"))) ; Tue->Mon
+
+    (should (equal (b- (m "2020-09-12") 1) (m "2020-09-11"))) ; Sat->Fri
+    (should (equal (b- (m "2020-09-13") 1) (m "2020-09-11"))) ; Sun->Fri
+
+    ;; Stepping fractional days
+    (should (equal (b+ (m "2020-09-08 21:00") '(frac 1 2))
+                   (m "2020-09-09 09:00")))
+    (should (equal (b+ (m "2020-09-11 21:00") '(frac 1 2))
+                   (m "2020-09-14 09:00")))
+    (should (equal (b- (m "2020-09-08 21:00") '(frac 1 2))
+                   (m "2020-09-08 09:00")))
+    (should (equal (b- (m "2020-09-14 06:00") '(frac 1 2))
+                   (m "2020-09-11 18:00")))
+
+    ;; Test with a couple of extra days off:
+    (let ((var-Holidays (list 'vec
+                              '(var sat var-sat) '(var sun var-sun)
+                              (m "2020-09-09") (m "2020-09-11"))))
+
+      (should (equal (b+ (m "2020-09-07") 1) (m "2020-09-08"))) ; Mon->Tue
+      (should (equal (b+ (m "2020-09-08") 1) (m "2020-09-10"))) ; Tue->Thu
+      (should (equal (b+ (m "2020-09-10") 1) (m "2020-09-14"))) ; Thu->Mon
+      (should (equal (b+ (m "2020-09-14") 1) (m "2020-09-15"))) ; Mon->Tue
+      (should (equal (b+ (m "2020-09-15") 1) (m "2020-09-16"))) ; Tue->Wed
+
+      (should (equal (b- (m "2020-09-16") 1) (m "2020-09-15"))) ; Wed->Tue
+      (should (equal (b- (m "2020-09-15") 1) (m "2020-09-14"))) ; Tue->Mon
+      (should (equal (b- (m "2020-09-14") 1) (m "2020-09-10"))) ; Mon->Thu
+      (should (equal (b- (m "2020-09-10") 1) (m "2020-09-08"))) ; Thu->Tue
+      (should (equal (b- (m "2020-09-08") 1) (m "2020-09-07"))) ; Tue->Mon
+      )
+
+    ;; Test with odd non-business weekdays (Tue, Wed, Sat):
+    (let ((var-Holidays '(vec (var tue var-tue)
+                              (var wed var-wed)
+                              (var sat var-sat))))
+      (should (equal (b+ (m "2020-09-07") 1) (m "2020-09-10"))) ; Mon->Thu
+      (should (equal (b+ (m "2020-09-10") 1) (m "2020-09-11"))) ; Thu->Fri
+      (should (equal (b+ (m "2020-09-11") 1) (m "2020-09-13"))) ; Fri->Sun
+      (should (equal (b+ (m "2020-09-13") 1) (m "2020-09-14"))) ; Sun->Mon
+
+      (should (equal (b- (m "2020-09-14") 1) (m "2020-09-13"))) ; Mon->Sun
+      (should (equal (b- (m "2020-09-13") 1) (m "2020-09-11"))) ; Sun->Fri
+      (should (equal (b- (m "2020-09-11") 1) (m "2020-09-10"))) ; Fri->Thu
+      (should (equal (b- (m "2020-09-10") 1) (m "2020-09-07"))) ; Thu->Mon
+      )
+  ))
+
+(ert-deftest calc-unix-date ()
+  (let* ((d-1970-01-01 (math-parse-date "1970-01-01"))
+         (d-2020-09-07 (math-parse-date "2020-09-07"))
+         (d-1991-01-09-0600 (math-parse-date "1991-01-09 06:00")))
+    ;; calcFunc-unixtime (command "t U") converts a date value to Unix time,
+    ;; and a number to a date.
+    (should (equal d-1970-01-01 '(date 719163)))
+    (should (equal (calcFunc-unixtime d-1970-01-01 0) 0))
+    (should (equal (calc-tests--calc-to-number (cadr (calcFunc-unixtime 0 0)))
+                   (cadr d-1970-01-01)))
+    (should (equal (calcFunc-unixtime d-2020-09-07 0)
+                   (* (- (cadr d-2020-09-07)
+                         (cadr d-1970-01-01))
+                      86400)))
+    (should (equal (calcFunc-unixtime d-1991-01-09-0600 0)
+                   663400800))
+    (should (equal (calc-tests--calc-to-number
+                    (cadr (calcFunc-unixtime 663400800 0)))
+                   726841.25))
+
+    (let ((calc-date-format '(U)))
+      ;; Test parsing Unix time.
+      (should (equal (calc-tests--calc-to-number
+                      (cadr (math-parse-date "0")))
+                     719163))
+      (should (equal (calc-tests--calc-to-number
+                      (cadr (math-parse-date "469324800")))
+                     (+ 719163 (/ 469324800 86400))))
+      (should (equal (calc-tests--calc-to-number
+                      (cadr (math-parse-date "663400800")))
+                     726841.25))
+
+      ;; Test formatting Unix time.
+      (should (equal (math-format-date d-1970-01-01) "0"))
+      (should (equal (math-format-date d-2020-09-07)
+                     (number-to-string (* (- (cadr d-2020-09-07)
+                                             (cadr d-1970-01-01))
+                                          86400))))
+      (should (equal (math-format-date d-1991-01-09-0600) "663400800")))))
+
 (provide 'calc-tests)
 ;;; calc-tests.el ends here
 
diff --git a/test/lisp/electric-tests.el b/test/lisp/electric-tests.el
index 8b9c1c5fcb5..5f63f6831b3 100644
--- a/test/lisp/electric-tests.el
+++ b/test/lisp/electric-tests.el
@@ -887,7 +887,8 @@ baz\"\""
     (should (equal (buffer-string) "int main () {\n  \n}"))))
 
 (ert-deftest electric-layout-control-reindentation ()
-  "Same as `e-l-int-main-kernel-style', but checking Bug#35254."
+  "Same as `emacs-lisp-int-main-kernel-style', but checking
+Bug#35254."
   (ert-with-test-buffer ()
     (plainer-c-mode)
     (electric-layout-local-mode 1)
diff --git a/test/lisp/emacs-lisp/backtrace-tests.el b/test/lisp/emacs-lisp/backtrace-tests.el
index 12164b46ec3..fbc71e0ec86 100644
--- a/test/lisp/emacs-lisp/backtrace-tests.el
+++ b/test/lisp/emacs-lisp/backtrace-tests.el
@@ -41,7 +41,7 @@
          (backtrace-mode)
          (setq backtrace-frames (backtrace-get-frames))
          (let ((this-index))
-           ;; Discard all past `backtrace-tests-make-backtrace'.
+           ;; Discard all past `backtrace-tests--make-backtrace'.
            (dotimes (index (length backtrace-frames))
              (when (eq (backtrace-frame-fun (nth index backtrace-frames))
                        'backtrace-tests--make-backtrace)
diff --git a/test/lisp/emacs-lisp/edebug-tests.el b/test/lisp/emacs-lisp/edebug-tests.el
index 04a7b2f5a0f..6db07b1b707 100644
--- a/test/lisp/emacs-lisp/edebug-tests.el
+++ b/test/lisp/emacs-lisp/edebug-tests.el
@@ -210,7 +210,7 @@ All other elements will be nil."
 (defvar edebug-tests-thunks nil
   "List containing thunks to run after each command in a keyboard macro.")
 (defvar edebug-tests-kbd-macro-index nil
-  "Index into `edebug-tests-run-unpacked-kbd-macro's current keyboard macro.")
+  "Index into `edebug-tests-run-kbd-macro's current keyboard macro.")
 
 (defun edebug-tests-run-macro (kbdmac &rest thunks)
   "Run a keyboard macro and execute a thunk after each command in it.
diff --git a/test/lisp/files-tests.el b/test/lisp/files-tests.el
index 2e9c6adc947..3829f505010 100644
--- a/test/lisp/files-tests.el
+++ b/test/lisp/files-tests.el
@@ -960,7 +960,7 @@ unquoted file names."
           (let ((linkname (expand-file-name "link" nospecial-dir)))
             (should-error (make-symbolic-link tmpfile linkname))))))))
 
-;; See `files-tests--file-name-non-special--subprocess'.
+;; See `files-tests-file-name-non-special--subprocess'.
 ;; (ert-deftest files-tests-file-name-non-special-process-file ())
 
 (ert-deftest files-tests-file-name-non-special-rename-file ()
@@ -1104,7 +1104,7 @@ unquoted file names."
   (files-tests--with-temp-non-special-and-file-name-handler (tmpfile nospecial)
     (should (equal (vc-registered nospecial) (vc-registered tmpfile)))))
 
-;; See test `files-tests--file-name-non-special--buffers'.
+;; See test `files-tests-file-name-non-special--buffers'.
 ;; (ert-deftest files-tests-file-name-non-special-verify-visited-file-modtime ())
 
 (ert-deftest files-tests-file-name-non-special-write-region ()
diff --git a/test/lisp/gnus/gnus-util-tests.el b/test/lisp/gnus/gnus-util-tests.el
index ec58032e84e..47f0a9cf761 100644
--- a/test/lisp/gnus/gnus-util-tests.el
+++ b/test/lisp/gnus/gnus-util-tests.el
@@ -151,8 +151,10 @@
   (should (equal "Zg==" (gnus-base64-repad "Zg")))
   (should (equal "Zg==" (gnus-base64-repad "Zg====")))
 
-  (should (equal (gnus-base64-repad " ") ""))
-  (should (equal (gnus-base64-repad "Zg== ") "Zg=="))
+  (should-error (gnus-base64-repad " ")
+                :type 'error)
+  (should-error (gnus-base64-repad "Zg== ")
+                :type 'error)
   (should-error (gnus-base64-repad "Z?\x00g==")
                 :type 'error)
   ;; line-length
@@ -162,9 +164,10 @@
   (should-error (gnus-base64-repad "Zm9v\r\nYmFy" t)
                 :type 'error)
   (should (equal "Zm9vYmFy" (gnus-base64-repad "Zm9vYmFy" t)))
-  (should (equal "Zm9vYmFy" (gnus-base64-repad "Zm9v\r\nYmFy" nil)))
-  (should (equal "Zm9vYmFy" (gnus-base64-repad "Zm9v\r\nYmFy\n" nil)))
-  (should (equal (gnus-base64-repad "Zm9v\r\n YmFy\r\n" nil) "Zm9vYmFy"))
+  (should (equal "Zm9vYmFy" (gnus-base64-repad "Zm9v\r\nYmFy")))
+  (should (equal "Zm9vYmFy" (gnus-base64-repad "Zm9v\r\nYmFy\n")))
+  (should (equal "Zm9vYmFy" (gnus-base64-repad "Zm9v\r\n YmFy\r\n")))
+  (should (equal "Zm9vYmFy" (gnus-base64-repad "Zm9v \r\n\tYmFy")))
   (should-error (gnus-base64-repad "Zm9v\r\nYmFy" nil 3)
                 :type 'error))
 
diff --git a/test/lisp/gnus/mml-sec-tests.el b/test/lisp/gnus/mml-sec-tests.el
index 4c745ea6d73..427018520c8 100644
--- a/test/lisp/gnus/mml-sec-tests.el
+++ b/test/lisp/gnus/mml-sec-tests.el
@@ -67,7 +67,6 @@ instead of gpg-agent."
 	(condition-case error
 	    (let ((epg-gpg-home-directory
                    (expand-file-name "test/data/mml-sec" source-directory))
-                  (mml-secure-allow-signing-with-unknown-recipient t)
 		  (mml-smime-use 'epg)
 		  ;; Create debug output in empty epg-debug-buffer.
 		  (epg-debug t)
@@ -762,37 +761,6 @@ Use sign-with-sender and encrypt-to-self."
 	    method "no-exp@example.org" "sub@example.org" 2 nil))
 	 )))))
 
-(ert-deftest mml-secure-sign-verify-2 ()
-  "Sign message without sender; then verify and test for expected result."
-  (skip-unless (test-conf))
-  (mml-secure-test-key-fixture
-   (lambda ()
-     (dolist (method (sign-standards) nil)
-       (let ((mml-secure-openpgp-sign-with-sender nil)
-	     (mml-secure-smime-sign-with-sender nil))
-	 ;; A single signing key for sender sub@example.org is customized
-	 ;; in the fixture, but not used here.
-	 ;; By default, gpg uses the first secret key in the keyring, which
-	 ;; is 02372A42CA6D40FB (OpenPGP) or
-	 ;; 0E58229B80EE33959FF718FEEF25402B479DC6E2 (S/MIME) here.
-	 (mml-secure-test-en-decrypt
-	  method "uid1@example.org" "sub@example.org" 0 nil)
-
-	 ;; From sub@example.org, sign with specified key:
-	 (let ((mml-secure-openpgp-signers '("02372A42CA6D40FB"))
-	       (mml-secure-smime-signers
-		'("D06AA118653CC38E9D0CAF56ED7A2135E1582177")))
-	   (mml-secure-test-en-decrypt
-	    method "no-exp@example.org" "sub@example.org" 1 nil))
-
-	 ;; From sub@example.org, sign with different specified key:
-	 (let ((mml-secure-openpgp-signers '("C3999CF1268DBEA2"))
-	       (mml-secure-smime-signers
-		'("0E58229B80EE33959FF718FEEF25402B479DC6E2")))
-	   (mml-secure-test-en-decrypt
-	    method "no-exp@example.org" "sub@example.org" 1 nil))
-	 )))))
-
 (ert-deftest mml-secure-sign-verify-3 ()
   "Try to sign message with expired OpenPGP subkey, which raises an error.
 With Ma Gnus v0.14 and earlier a signature would be created with a wrong key."
diff --git a/test/lisp/mail/uudecode-tests.el b/test/lisp/mail/uudecode-tests.el
index 61c20075633..4c9650f556c 100644
--- a/test/lisp/mail/uudecode-tests.el
+++ b/test/lisp/mail/uudecode-tests.el
@@ -43,12 +43,12 @@
   (uudecode-tests-read-file
    (expand-file-name "uuencoded.txt" uudecode-tests-data-dir))
   "Uuencoded data for bookmark-tests.el
-Same as `bookmark-tests-decoded-str' but uuencoded.")
+Same as `uudecode-tests-decoded-str' but uuencoded.")
 (defvar uudecode-tests-decoded-str
   (uudecode-tests-read-file
    (expand-file-name "uudecoded.txt" uudecode-tests-data-dir))
   "Plain text data for bookmark-tests.el
-Same as `bookmark-tests-encoded-str' but plain text.")
+Same as `uudecode-tests-encoded-str' but plain text.")
 
 (ert-deftest uudecode-tests-decode-region-internal ()
   ;; Write to buffer
diff --git a/test/lisp/net/dbus-resources/org.gnu.Emacs.TestDBus.xml b/test/lisp/net/dbus-resources/org.gnu.Emacs.TestDBus.xml
new file mode 100644
index 00000000000..620f10510f2
--- /dev/null
+++ b/test/lisp/net/dbus-resources/org.gnu.Emacs.TestDBus.xml
@@ -0,0 +1,49 @@
+<?xml version="1.0"?>
+<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN" "http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
+<node>
+  <interface name="org.freedesktop.DBus.Introspectable">
+    <method name="Introspect">
+      <arg name="xml" type="s" direction="out"/>
+    </method>
+  </interface>
+  <interface name="org.freedesktop.DBus.Properties">
+    <method name="Get">
+      <arg name="interface" type="s" direction="in"/>
+      <arg name="name" type="s" direction="in"/>
+      <arg name="value" type="v" direction="out"/>
+    </method>
+    <method name="Set">
+      <arg name="interface" type="s" direction="in"/>
+      <arg name="name" type="s" direction="in"/>
+      <arg name="value" type="v" direction="in"/>
+    </method>
+    <method name="GetAll">
+      <arg name="interface" type="s" direction="in"/>
+      <arg name="properties" type="a{sv}" direction="out"/>
+    </method>
+    <signal name="PropertiesChanged">
+      <arg name="interface" type="s"/>
+      <arg name="changed_properties" type="a{sv}"/>
+      <arg name="invalidated_properties" type="as"/>
+    </signal>
+  </interface>
+  <interface name="org.gnu.Emacs.TestDBus.Interface">
+    <method name="Connect">
+      <arg name="uuid" type="s" direction="in"/>
+      <arg name="mode" type="y" direction="in"/>
+      <arg name="options" type="a{sv}" direction="in"/>
+      <arg name="interface" type="s" direction="out"/>
+    </method>
+    <method name="DeprecatedMethod0">
+      <annotation name="org.freedesktop.DBus.Deprecated" value="true"/>
+    </method>
+    <method name="DeprecatedMethod1">
+      <annotation name="org.freedesktop.DBus.Deprecated" value="true"/>
+    </method>
+    <property name="Connected" type="b" access="read"/>
+    <property name="Player" type="o" access="read"/>
+    <annotation name="org.freedesktop.DBus.Deprecated" value="true"/>
+  </interface>
+  <node name="node0"/>
+  <node name="node1"/>
+</node>
diff --git a/test/lisp/net/dbus-tests.el b/test/lisp/net/dbus-tests.el
index 74c0dddcf52..7ebef5d2609 100644
--- a/test/lisp/net/dbus-tests.el
+++ b/test/lisp/net/dbus-tests.el
@@ -46,6 +46,13 @@
 (defconst dbus--test-interface "org.gnu.Emacs.TestDBus.Interface"
   "Test interface.")
 
+(defconst dbus--tests-dir
+  (file-truename
+   (expand-file-name "dbus-resources"
+                     (file-name-directory (or load-file-name
+                                              buffer-file-name))))
+  "Directory containing introspection test data file.")
+
 (defun dbus--test-availability (bus)
   "Test availability of D-Bus BUS."
   (should (dbus-list-names bus))
@@ -309,7 +316,7 @@
    (dbus-check-arguments :session dbus--test-service :double "string")
    :type 'wrong-type-argument)
 
-  ;; `:unix-fd'.  UNIX file descriptors are transfered out-of-band.
+  ;; `:unix-fd'.  UNIX file descriptors are transferred out-of-band.
   ;; We do not support this, and so we cannot do much testing here for
   ;; `:unix-fd' being an argument (which is an index to the file
   ;; descriptor in the array of file descriptors that accompany the
@@ -359,11 +366,11 @@
   (should
    (dbus-check-arguments
     :session dbus--test-service '(:variant (:array "string"))))
-  ;; No or more than one element.
-  ;; FIXME.
-  ;; (should-error
-  ;;  (dbus-check-arguments :session dbus--test-service '(:variant))
-  ;;  :type 'wrong-type-argument)
+  ;; Empty variant.
+  (should-error
+   (dbus-check-arguments :session dbus--test-service '(:variant))
+   :type 'wrong-type-argument)
+  ;; More than one element.
   (should-error
    (dbus-check-arguments
     :session dbus--test-service
@@ -375,20 +382,22 @@
   (should
    (dbus-check-arguments
     :session dbus--test-service
-    '(:array (:dict-entry :string "string" :boolean t))))
+    '(:array (:dict-entry :string "string" :boolean nil))))
   ;; This is an alternative syntax.  FIXME: Shall this be supported?
   (should
    (dbus-check-arguments
     :session dbus--test-service
     '(:array :dict-entry (:string "string" :boolean t))))
-  ;; FIXME: Must be errors.
-  ;; (should
-  ;;  (dbus-check-arguments
-  ;;   :session dbus--test-service '(:array (:dict-entry))))
-  ;; (should
-  ;;  (dbus-check-arguments
-  ;;   :session dbus--test-service '(:array (:dict-entry :string "string"))))
-  ;; Not two elements.
+  ;; Empty dict-entry.
+  (should-error
+   (dbus-check-arguments
+    :session dbus--test-service '(:array (:dict-entry)))
+   :type 'wrong-type-argument)
+  ;; One element.
+  (should-error
+   (dbus-check-arguments
+    :session dbus--test-service '(:array (:dict-entry :string "string")))
+   :type 'wrong-type-argument)
   (should-error
    (dbus-check-arguments
     :session dbus--test-service
@@ -405,25 +414,27 @@
    (dbus-check-arguments
     :session dbus--test-service '(:dict-entry :string "string" :boolean t))
    :type 'wrong-type-argument)
-  ;; FIXME:! This doesn't look right.
-  ;; Different dict entry types can be part of an array ???
-  (should
-   (dbus-check-arguments
-    :session dbus--test-service
-    '(:array
-      (:dict-entry :string "string1" :boolean t)
-      (:dict-entry :string "string2" :object-path "/object/path"))))
+  ;; Different dict entry types are not ched.  FIXME: Add check.
+  ;; (should-error
+  ;;  (dbus-check-arguments
+  ;;   :session dbus--test-service
+  ;;   '(:array
+  ;;     (:dict-entry :string "string1" :boolean t)
+  ;;     (:dict-entry :string "string2" :object-path "/object/path")))
+  ;;  :type 'wrong-type-argument)
 
   ;; `:struct'.  There is no restriction what could be an element of a struct.
-  ;; Empty struct.  FIXME: Is this right?
-  ;; (should (dbus-check-arguments :session dbus--test-service '(:struct)))
   (should
    (dbus-check-arguments
     :session dbus--test-service
     '(:struct
       :string "string"
       :object-path "/object/path"
-      (:variant (:array :unix-fd 1 :unix-fd 2 :unix-fd 3 :unix-fd 4))))))
+      (:variant (:array :unix-fd 1 :unix-fd 2 :unix-fd 3 :unix-fd 4)))))
+  ;; Empty struct.
+  (should-error
+   (dbus-check-arguments :session dbus--test-service '(:struct))
+   :type 'wrong-type-argument))
 
 (defun dbus--test-register-service (bus)
   "Check service registration at BUS."
@@ -625,6 +636,63 @@ This includes initialization and closing the bus."
     ;; Cleanup.
     (dbus-unregister-service :session dbus--test-service)))
 
+(defun dbus--test-method-reentry-handler (&rest _args)
+  "Method handler for `dbus-test04-method-reentry'."
+  (dbus-get-all-managed-objects :session dbus--test-service dbus--test-path)
+  42)
+
+(ert-deftest dbus-test04-method-reentry ()
+  "Check receiving method call while awaiting response.
+Ensure that incoming method calls are handled when call to `dbus-call-method'
+is in progress."
+  :tags '(:expensive-test)
+  ;; Simulate application registration.  (Bug#43251)
+  (skip-unless dbus--test-enabled-session-bus)
+  (dbus-ignore-errors (dbus-unregister-service :session dbus--test-service))
+
+  (unwind-protect
+      (let ((method "Reentry"))
+        (should
+         (equal
+          (dbus-register-method
+           :session dbus--test-service dbus--test-path
+           dbus--test-interface method #'dbus--test-method-reentry-handler)
+          `((:method :session ,dbus--test-interface ,method)
+            (,dbus--test-service ,dbus--test-path
+             dbus--test-method-reentry-handler))))
+
+        (should
+         (=
+          (dbus-call-method
+           :session dbus--test-service dbus--test-path
+           dbus--test-interface method)
+          42)))
+
+    ;; Cleanup.
+    (dbus-unregister-service :session dbus--test-service)))
+
+(ert-deftest dbus-test04-call-method-timeout ()
+  "Verify `dbus-call-method' request timeout."
+  :tags '(:expensive-test)
+  (skip-unless dbus--test-enabled-session-bus)
+  (dbus-ignore-errors (dbus-unregister-service :session dbus--test-service))
+  (dbus-register-service :session dbus--test-service)
+
+  (unwind-protect
+      (let ((start (current-time)))
+        ;; Test timeout override for method call.
+        (should-error
+         (dbus-call-method
+          :session dbus--test-service dbus--test-path
+          dbus-interface-introspectable "Introspect" :timeout 2500)
+         :type 'dbus-error)
+
+        (should
+         (< 2.4 (float-time (time-since start)) 2.7)))
+
+    ;; Cleanup.
+    (dbus-unregister-service :session dbus--test-service)))
+
 (defvar dbus--test-signal-received nil
   "Received signal value in `dbus--test-signal-handler'.")
 
@@ -1069,6 +1137,702 @@ This includes initialization and closing the bus."
     ;; Cleanup.
     (dbus-unregister-service :session dbus--test-service)))
 
+(defsubst dbus--test-run-property-test (selector name value expected)
+  "Generate a property test: register, set, get, getall sequence.
+This is a helper function for the macro `dbus--test-property'.
+The argument SELECTOR indicates whether the test should expand to
+`dbus-register-property' (if SELECTOR is `register') or
+`dbus-set-property' (if SELECTOR is `set').
+The argument NAME is the property name.
+The argument VALUE is the value to register or set.
+The argument EXPECTED is a transformed VALUE representing the
+form `dbus-get-property' should return."
+  (cond
+   ((eq selector 'register)
+    (should
+     (equal
+      (dbus-register-property
+       :session dbus--test-service dbus--test-path dbus--test-interface name
+       :readwrite value)
+      `((:property :session ,dbus--test-interface ,name)
+        (,dbus--test-service ,dbus--test-path)))))
+
+   ((eq selector 'set)
+    (should
+     (equal
+      (dbus-set-property
+       :session dbus--test-service dbus--test-path dbus--test-interface name
+       value)
+      expected)))
+
+   (t (signal 'wrong-type-argument "Selector should be 'register or 'set.")))
+
+  (should
+   (equal
+    (dbus-get-property
+     :session dbus--test-service dbus--test-path dbus--test-interface name)
+    expected))
+
+  (let ((result
+         (dbus-get-all-properties
+          :session dbus--test-service dbus--test-path dbus--test-interface)))
+    (should (equal (cdr (assoc name result)) expected)))
+
+  (let ((result
+         (dbus-get-all-managed-objects :session dbus--test-service "/"))
+        result1)
+    (should (setq result1 (cadr (assoc dbus--test-path result))))
+    (should (setq result1 (cadr (assoc dbus--test-interface result1))))
+    (should (equal (cdr (assoc name result1)) expected))))
+
+(defsubst dbus--test-property (name &rest value-list)
+  "Test a D-Bus property named by string argument NAME.
+The argument VALUE-LIST is a sequence of pairs, where each pair
+represents a value form and an expected returned value form.  The
+first pair in VALUES is used for `dbus-register-property'.
+Subsequent pairs of the list are tested with `dbus-set-property'."
+  (let ((values (car value-list)))
+    (dbus--test-run-property-test
+     'register name (car values) (cdr values)))
+  (dolist (values (cdr value-list))
+    (dbus--test-run-property-test
+     'set name (car values) (cdr values))))
+
+(ert-deftest dbus-test06-property-types ()
+  "Check property access and mutation for an own service."
+  (skip-unless dbus--test-enabled-session-bus)
+  (dbus-ignore-errors (dbus-unregister-service :session dbus--test-service))
+  (dbus-register-service :session dbus--test-service)
+
+  (unwind-protect
+      (progn
+        (dbus--test-property
+         "ByteArray"
+         '((:array :byte 1 :byte 2 :byte 3) . (1 2 3))
+         '((:array :byte 4 :byte 5 :byte 6) . (4 5 6)))
+
+        (dbus--test-property
+         "StringArray"
+         '((:array "one" "two" :string "three") . ("one" "two" "three"))
+         '((:array :string "four" :string "five" "six") . ("four" "five" "six")))
+
+        (dbus--test-property
+         "ObjectArray"
+         '((:array
+            :object-path "/node00"
+            :object-path "/node01"
+            :object-path "/node0/node02")
+           . ("/node00" "/node01" "/node0/node02"))
+         '((:array
+            :object-path "/node10"
+            :object-path "/node11"
+            :object-path "/node0/node12")
+           . ("/node10" "/node11" "/node0/node12")))
+
+        (dbus--test-property
+         "Dictionary"
+         '((:array
+            :dict-entry (:string "four" (:variant :string "value of four"))
+            :dict-entry ("five" (:variant :object-path "/node0"))
+            :dict-entry ("six"  (:variant (:array :byte 4 :byte 5 :byte 6))))
+           . (("four"
+               ("value of four"))
+              ("five"
+               ("/node0"))
+              ("six"
+               ((4 5 6)))))
+         '((:array
+            :dict-entry
+            (:string "key0" (:variant (:array :byte 7 :byte 8 :byte 9)))
+            :dict-entry ("key1" (:variant :string "value"))
+            :dict-entry ("key2" (:variant :object-path "/node0/node1")))
+           . (("key0"
+               ((7 8 9)))
+              ("key1"
+               ("value"))
+              ("key2"
+               ("/node0/node1")))))
+
+        (dbus--test-property            ; Syntax emphasizing :dict compound type.
+         "Dictionary"
+         '((:array
+            (:dict-entry :string "seven" (:variant :string "value of seven"))
+            (:dict-entry "eight" (:variant :object-path "/node8"))
+            (:dict-entry "nine"  (:variant (:array :byte 9 :byte 27 :byte 81))))
+           . (("seven"
+               ("value of seven"))
+              ("eight"
+               ("/node8"))
+              ("nine"
+               ((9 27 81)))))
+         '((:array
+            (:dict-entry
+             :string "key4" (:variant (:array :byte 7 :byte 49 :byte 125)))
+            (:dict-entry "key5" (:variant :string "obsolete"))
+            (:dict-entry "key6" (:variant :object-path "/node6/node7")))
+           . (("key4"
+               ((7 49 125)))
+              ("key5"
+               ("obsolete"))
+              ("key6"
+               ("/node6/node7")))))
+
+        (dbus--test-property
+         "ByteDictionary"
+         '((:array
+            (:dict-entry :byte  8 (:variant :string "byte-eight"))
+            (:dict-entry :byte 16 (:variant :object-path "/byte/sixteen"))
+            (:dict-entry :byte 48 (:variant (:array :byte 8 :byte 9 :byte 10))))
+           . (( 8 ("byte-eight"))
+              (16 ("/byte/sixteen"))
+              (48 ((8 9 10))))))
+
+        (dbus--test-property
+         "Variant"
+         '((:variant "Variant string") . ("Variant string"))
+         '((:variant :byte 42) . (42))
+         '((:variant :uint32 1000000) . (1000000))
+         '((:variant :object-path "/variant/path") . ("/variant/path"))
+         '((:variant :signature "a{sa{sv}}") . ("a{sa{sv}}"))
+         '((:variant
+            (:struct
+             42 "string" (:object-path "/structure/path") (:variant "last")))
+           . ((42 "string" ("/structure/path") ("last")))))
+
+        ;; Test that :read prevents writes.
+        (should
+         (equal
+          (dbus-register-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "StringArray" :read '(:array "one" "two" :string "three"))
+          `((:property :session ,dbus--test-interface "StringArray")
+	    (,dbus--test-service ,dbus--test-path))))
+
+        (should-error          ; Cannot set property with :read access.
+         (dbus-set-property
+          :session dbus--test-service dbus--test-path dbus--test-interface
+          "StringArray" '(:array "seven" "eight" :string "nine"))
+         :type 'dbus-error)
+
+        (should                    ; Property value preserved on error.
+         (equal
+          (dbus-get-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "StringArray")
+          '("one" "two" "three")))
+
+        ;; Test mismatched types in array.
+        (should-error
+         (dbus-register-property
+          :session dbus--test-service dbus--test-path dbus--test-interface
+          "MixedArray" :readwrite
+          '(:array
+            :object-path "/node00"
+            :string "/node01"
+            :object-path "/node0/node02"))
+         :type 'wrong-type-argument)
+
+        ;; Test in-range integer values.
+        (should
+         (equal
+          (dbus-register-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "ByteValue" :readwrite :byte 255)
+          `((:property :session ,dbus--test-interface "ByteValue")
+	    (,dbus--test-service ,dbus--test-path))))
+
+        (should
+         (=
+          (dbus-get-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "ByteValue")
+          255))
+
+        (should
+         (equal
+          (dbus-register-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "ShortValue" :readwrite :int16 32767)
+          `((:property :session ,dbus--test-interface "ShortValue")
+	    (,dbus--test-service ,dbus--test-path))))
+
+        (should
+         (=
+          (dbus-get-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "ShortValue")
+          32767))
+
+        (should
+         (equal
+          (dbus-register-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "UShortValue" :readwrite :uint16 65535)
+          `((:property :session ,dbus--test-interface "UShortValue")
+	    (,dbus--test-service ,dbus--test-path))))
+
+        (should
+         (=
+          (dbus-get-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "UShortValue")
+          65535))
+
+        (should
+         (equal
+          (dbus-register-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "IntValue" :readwrite :int32 2147483647)
+          `((:property :session ,dbus--test-interface "IntValue")
+	    (,dbus--test-service ,dbus--test-path))))
+
+        (should
+         (=
+          (dbus-get-property
+           :session dbus--test-service dbus--test-path
+           dbus--test-interface "IntValue")
+          2147483647))
+
+        (should
+         (equal
+          (dbus-register-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "UIntValue" :readwrite :uint32 4294967295)
+          `((:property :session ,dbus--test-interface "UIntValue")
+	    (,dbus--test-service ,dbus--test-path))))
+
+        (should
+         (=
+          (dbus-get-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "UIntValue")
+          4294967295))
+
+        (should
+         (equal
+          (dbus-register-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "LongValue" :readwrite :int64 9223372036854775807)
+          `((:property :session ,dbus--test-interface "LongValue")
+	    (,dbus--test-service ,dbus--test-path))))
+
+        (should
+         (=
+          (dbus-get-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "LongValue")
+          9223372036854775807))
+
+        (should
+         (equal
+          (dbus-register-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "ULongValue" :readwrite :uint64 18446744073709551615)
+          `((:property :session ,dbus--test-interface "ULongValue")
+	    (,dbus--test-service ,dbus--test-path))))
+
+        (should
+         (=
+          (dbus-get-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "ULongValue")
+          18446744073709551615))
+
+        ;; Test integer overflow.
+        (should
+         (=
+          (dbus-set-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "ByteValue" :byte 520)
+          8))
+
+        (should
+         (=
+          (dbus-get-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "ByteValue")
+          8))
+
+        (should-error
+         (dbus-register-property
+          :session dbus--test-service dbus--test-path dbus--test-interface
+          "ShortValue" :readwrite :int16 32800)
+         :type 'args-out-of-range)
+
+        (should-error
+         (dbus-register-property
+          :session dbus--test-service dbus--test-path dbus--test-interface
+          "UShortValue" :readwrite :uint16 65600)
+         :type 'args-out-of-range)
+
+        (should-error
+         (dbus-register-property
+          :session dbus--test-service dbus--test-path dbus--test-interface
+          "IntValue" :readwrite :int32 2147483700)
+         :type 'args-out-of-range)
+
+        (should-error
+         (dbus-register-property
+          :session dbus--test-service dbus--test-path dbus--test-interface
+          "UIntValue" :readwrite :uint32 4294967300)
+         :type 'args-out-of-range)
+
+        (should-error
+         (dbus-register-property
+          :session dbus--test-service dbus--test-path dbus--test-interface
+          "LongValue" :readwrite :int64 9223372036854775900)
+         :type 'args-out-of-range)
+
+        (should-error
+         (dbus-register-property
+          :session dbus--test-service dbus--test-path dbus--test-interface
+          "ULongValue" :readwrite :uint64 18446744073709551700)
+         :type 'args-out-of-range)
+
+        ;; dbus-set-property may change property type.
+        (should
+         (=
+          (dbus-set-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "ByteValue" 1024)
+          1024))
+
+        (should
+         (=
+          (dbus-get-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "ByteValue")
+          1024))
+
+        (should                         ; Another change property type test.
+         (equal
+          (dbus-set-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "ByteValue" :boolean t)
+          t))
+
+        (should
+         (eq
+          (dbus-get-property
+           :session dbus--test-service dbus--test-path dbus--test-interface
+           "ByteValue")
+          t))
+
+        ;; Test invalid type specification.
+        (should-error
+         (dbus-register-property
+          :session dbus--test-service dbus--test-path dbus--test-interface
+          "InvalidType" :readwrite :keyword 128)
+         :type 'wrong-type-argument))
+
+    ;; Cleanup.
+    (dbus-unregister-service :session dbus--test-service)))
+
+(defun dbus--test-introspect ()
+  "Return test introspection string."
+  (when (string-equal dbus--test-path (dbus-event-path-name last-input-event))
+    (with-temp-buffer
+      (insert-file-contents-literally
+       (expand-file-name "org.gnu.Emacs.TestDBus.xml" dbus--tests-dir))
+      (buffer-string))))
+
+(defsubst dbus--test-validate-interface
+  (iface-name expected-properties expected-methods expected-signals
+              expected-annotations)
+  "Validate an interface definition for `dbus-test07-introspection'.
+The argument IFACE-NAME is a string naming the interface to validate.
+The arguments EXPECTED-PROPERTIES, EXPECTED-METHODS, EXPECTED-SIGNALS, and
+EXPECTED-ANNOTATIONS represent the names of the interface's properties,
+methods, signals, and annotations, respectively."
+
+  (let ((interface
+         (dbus-introspect-get-interface
+          :session dbus--test-service dbus--test-path iface-name)))
+    (pcase-let ((`(interface ((name . ,name)) . ,rest) interface))
+      (should
+       (string-equal name iface-name))
+      (should
+       (string-equal name (dbus-introspect-get-attribute interface "name")))
+
+      (let (properties methods signals annotations)
+        (mapc (lambda (x)
+                (let ((name (dbus-introspect-get-attribute x "name")))
+                  (cond
+                   ((eq 'property (car x))   (push name properties))
+                   ((eq 'method (car x))     (push name methods))
+                   ((eq 'signal (car x))     (push name signals))
+                   ((eq 'annotation (car x)) (push name annotations)))))
+              rest)
+
+        (should
+         (equal
+          (nreverse properties)
+          expected-properties))
+        (should
+         (equal
+          (nreverse methods)
+          expected-methods))
+        (should
+         (equal
+          (nreverse signals)
+          expected-signals))
+        (should
+         (equal
+          (nreverse annotations)
+          expected-annotations))))))
+
+(defsubst dbus--test-validate-annotations (annotations expected-annotations)
+  "Validate a list of D-Bus ANNOTATIONS.
+Ensure each string in EXPECTED-ANNOTATIONS names an element of ANNOTATIONS.
+And ensure each ANNOTATIONS has a value attribute marked \"true\"."
+  (mapc
+   (lambda (annotation)
+     (let ((name (dbus-introspect-get-attribute annotation "name"))
+           (value (dbus-introspect-get-attribute annotation "value")))
+       (should
+        (member name expected-annotations))
+       (should
+        (equal value "true"))))
+   annotations))
+
+(defsubst dbus--test-validate-property
+  (interface property-name _expected-annotations &rest expected-args)
+  "Validate a property definition for `dbus-test07-introspection'.
+
+The argument INTERFACE is a string naming the interface owning PROPERTY-NAME.
+The argument PROPERTY-NAME is a string naming the property to validate.
+The arguments EXPECTED-ANNOTATIONS is a list of strings matching
+the annotation names defined for the method or signal.
+The argument EXPECTED-ARGS is a list of expected arguments for the property."
+  (let* ((property
+          (dbus-introspect-get-property
+           :session dbus--test-service dbus--test-path interface property-name))
+         (name (dbus-introspect-get-attribute property "name"))
+         (type (dbus-introspect-get-attribute property "type"))
+         (access (dbus-introspect-get-attribute property "access"))
+         (expected (assoc-string name expected-args)))
+    (should expected)
+
+    (should
+     (string-equal name property-name))
+
+    (should
+     (string-equal
+      (nth 0 expected)
+      name))
+
+    (should
+     (string-equal
+      (nth 1 expected)
+      type))
+
+    (should
+     (string-equal
+      (nth 2 expected)
+      access))))
+
+(defsubst dbus--test-validate-m-or-s (tree expected-annotations expected-args)
+  "Validate a method or signal definition for `dbus-test07-introspection'.
+The argument TREE is an sexp returned from either `dbus-introspect-get-method'
+or `dbus-introspect-get-signal'
+The arguments EXPECTED-ANNOTATIONS is a list of strings matching
+the annotation names defined for the method or signal.
+The argument EXPECTED-ARGS is a list of expected arguments for
+the method or signal."
+  (let (args annotations)
+    (mapc (lambda (elem)
+            (cond
+             ((eq 'arg (car elem)) (push elem args))
+             ((eq 'annotation (car elem)) (push elem annotations))))
+          tree)
+    (should
+     (equal
+      (nreverse args)
+      expected-args))
+    (dbus--test-validate-annotations annotations expected-annotations)))
+
+(defsubst dbus--test-validate-signal
+  (interface signal-name expected-annotations &rest expected-args)
+  "Validate a signal definition for `dbus-test07-introspection'.
+
+The argument INTERFACE is a string naming the interface owning SIGNAL-NAME.
+The argument SIGNAL-NAME is a string naming the signal to validate.
+The arguments EXPECTED-ANNOTATIONS is a list of strings matching
+the annotation names defined for the signal.
+The argument EXPECTED-ARGS is a list of expected arguments for the signal."
+  (let ((signal
+         (dbus-introspect-get-signal
+          :session dbus--test-service dbus--test-path interface signal-name)))
+    (pcase-let ((`(signal ((name . ,name)) . ,rest) signal))
+      (should
+       (string-equal name signal-name))
+      (should
+       (string-equal name (dbus-introspect-get-attribute signal "name")))
+      (dbus--test-validate-m-or-s rest expected-annotations expected-args))))
+
+(defsubst dbus--test-validate-method
+  (interface method-name expected-annotations &rest expected-args)
+  "Validate a method definition for `dbus-test07-introspection'.
+
+The argument INTERFACE is a string naming the interface owning METHOD-NAME.
+The argument METHOD-NAME is a string naming the method to validate.
+The arguments EXPECTED-ANNOTATIONS is a list of strings matching
+the annotation names defined for the method.
+The argument EXPECTED-ARGS is a list of expected arguments for the method."
+  (let ((method
+         (dbus-introspect-get-method
+          :session dbus--test-service dbus--test-path interface method-name)))
+    (pcase-let ((`(method ((name . ,name)) . ,rest) method))
+      (should
+       (string-equal name method-name))
+      (should
+       (string-equal name (dbus-introspect-get-attribute method "name")))
+      (dbus--test-validate-m-or-s rest expected-annotations expected-args))))
+
+(ert-deftest dbus-test07-introspection ()
+  "Register an Introspection interface then query it."
+  (skip-unless dbus--test-enabled-session-bus)
+  (dbus-ignore-errors (dbus-unregister-service :session dbus--test-service))
+  (dbus-register-service :session dbus--test-service)
+
+  ;; Prepare introspection response.
+  (dbus-register-method
+   :session dbus--test-service dbus--test-path dbus-interface-introspectable
+   "Introspect" 'dbus--test-introspect)
+  (dbus-register-method
+   :session dbus--test-service (concat dbus--test-path "/node0")
+   dbus-interface-introspectable
+   "Introspect" 'dbus--test-introspect)
+  (dbus-register-method
+   :session dbus--test-service (concat dbus--test-path "/node1")
+   dbus-interface-introspectable
+   "Introspect" 'dbus--test-introspect)
+  (unwind-protect
+      (let ((start (current-time)))
+        ;; dbus-introspect-get-node-names
+        (should
+         (equal
+          (dbus-introspect-get-node-names
+           :session dbus--test-service dbus--test-path)
+          '("node0" "node1")))
+
+        ;; dbus-introspect-get-all-nodes
+        (should
+         (equal
+          (dbus-introspect-get-all-nodes
+           :session dbus--test-service dbus--test-path)
+          (list dbus--test-path
+                (concat dbus--test-path "/node0")
+                (concat dbus--test-path "/node1"))))
+
+        ;; dbus-introspect-get-interface-names
+        (let ((interfaces
+               (dbus-introspect-get-interface-names
+                :session dbus--test-service dbus--test-path)))
+
+          (should
+           (equal
+            interfaces
+            `(,dbus-interface-introspectable
+              ,dbus-interface-properties
+              ,dbus--test-interface)))
+
+          (dbus--test-validate-interface
+           dbus-interface-introspectable nil '("Introspect") nil nil)
+
+          ;; dbus-introspect-get-interface via `dbus--test-validate-interface'.
+          (dbus--test-validate-interface
+           dbus-interface-properties nil
+           '("Get" "Set" "GetAll") '("PropertiesChanged") nil)
+
+          (dbus--test-validate-interface
+           dbus--test-interface '("Connected" "Player")
+           '("Connect" "DeprecatedMethod0" "DeprecatedMethod1") nil
+           `(,dbus-annotation-deprecated)))
+
+        ;; dbus-introspect-get-method-names
+        (let ((methods
+               (dbus-introspect-get-method-names
+                :session dbus--test-service dbus--test-path
+                dbus--test-interface)))
+          (should
+           (equal
+            methods
+            '("Connect" "DeprecatedMethod0" "DeprecatedMethod1")))
+
+          ;; dbus-introspect-get-method via `dbus--test-validate-method'.
+          (dbus--test-validate-method
+           dbus--test-interface "Connect" nil
+           '(arg ((name . "uuid")      (type . "s")     (direction . "in")))
+           '(arg ((name . "mode")      (type . "y")     (direction . "in")))
+           '(arg ((name . "options")   (type . "a{sv}") (direction . "in")))
+           '(arg ((name . "interface") (type . "s")     (direction . "out"))))
+
+          (dbus--test-validate-method
+           dbus--test-interface "DeprecatedMethod0"
+           `(,dbus-annotation-deprecated))
+
+          (dbus--test-validate-method
+           dbus--test-interface "DeprecatedMethod1"
+           `(,dbus-annotation-deprecated)))
+
+        ;; dbus-introspect-get-signal-names
+        (let ((signals
+               (dbus-introspect-get-signal-names
+                :session dbus--test-service dbus--test-path
+                dbus-interface-properties)))
+          (should
+           (equal
+            signals
+            '("PropertiesChanged")))
+
+          ;; dbus-introspect-get-signal via `dbus--test-validate-signal'.
+          (dbus--test-validate-signal
+           dbus-interface-properties "PropertiesChanged" nil
+           '(arg ((name . "interface")              (type . "s")))
+           '(arg ((name . "changed_properties")     (type . "a{sv}")))
+           '(arg ((name . "invalidated_properties") (type . "as")))))
+
+        ;; dbus-intropct-get-property-names
+        (let ((properties
+               (dbus-introspect-get-property-names
+                :session dbus--test-service dbus--test-path
+                dbus--test-interface)))
+          (should
+           (equal
+            properties
+            '("Connected" "Player")))
+
+          ;; dbus-introspect-get-property via `dbus--test-validate-property'.
+          (dbus--test-validate-property
+           dbus--test-interface "Connected" nil
+           '("Connected" "b" "read")
+           '("Player" "o" "read")))
+
+        ;; Elapsed time over a second suggests timeouts.
+        (should
+         (< 0.0 (float-time (time-since start)) 1.0)))
+
+    ;; Cleanup.
+    (dbus-unregister-service :session dbus--test-service)))
+
+(ert-deftest dbus-test07-introspection-timeout ()
+  "Verify introspection request timeouts."
+  :tags '(:expensive-test)
+  (skip-unless dbus--test-enabled-session-bus)
+  (dbus-ignore-errors (dbus-unregister-service :session dbus--test-service))
+  (dbus-register-service :session dbus--test-service)
+
+  (unwind-protect
+      (let ((start (current-time)))
+        (dbus-introspect-xml :session dbus--test-service dbus--test-path)
+        ;; Introspection internal timeout is one second.
+        (should
+         (< 1.0 (float-time (time-since start)))))
+
+    ;; Cleanup.
+    (dbus-unregister-service :session dbus--test-service)))
+
 (defun dbus-test-all (&optional interactive)
   "Run all tests for \\[dbus]."
   (interactive "p")
diff --git a/test/lisp/obsolete/cl-tests.el b/test/lisp/obsolete/cl-tests.el
index 37061df0a7a..3f3fda3638e 100644
--- a/test/lisp/obsolete/cl-tests.el
+++ b/test/lisp/obsolete/cl-tests.el
@@ -21,7 +21,8 @@
 
 ;;; Code:
 
-(require 'cl)
+(with-no-warnings
+  (require 'cl))
 (require 'ert)
 
 
diff --git a/test/lisp/progmodes/python-tests.el b/test/lisp/progmodes/python-tests.el
index 6b3e63653be..bc77443ff4f 100644
--- a/test/lisp/progmodes/python-tests.el
+++ b/test/lisp/progmodes/python-tests.el
@@ -339,7 +339,7 @@ def func(arg):
     # I don't do much
     return arg
     # This comment is badly indented because the user forced so.
-    # At this line python.el wont dedent, user is always right.
+    # At this line python.el won't dedent, user is always right.
 
 comment_wins_over_ender = True
 
@@ -358,7 +358,7 @@ comment_wins_over_ender = True
    ;; The return keyword do make indentation lose a level...
    (should (= (python-indent-calculate-indentation) 0))
    ;; ...but the current indentation was forced by the user.
-   (python-tests-look-at "# At this line python.el wont dedent")
+   (python-tests-look-at "# At this line python.el won't dedent")
    (should (eq (car (python-indent-context)) :after-comment))
    (should (= (python-indent-calculate-indentation) 4))
    ;; Should behave the same for blank lines: potentially a comment.
diff --git a/test/lisp/simple-tests.el b/test/lisp/simple-tests.el
index 457de91c149..d4b316811e6 100644
--- a/test/lisp/simple-tests.el
+++ b/test/lisp/simple-tests.el
@@ -44,7 +44,7 @@
 ;;; `count-words'
 (ert-deftest simple-test-count-words-bug-41761 ()
   (with-temp-buffer
-    (dotimes (i 10) (insert (propertize "test " 'field (cons nil nil))))
+    (dotimes (_i 10) (insert (propertize "test " 'field (cons nil nil))))
     (should (= (count-words (point-min) (point-max)) 10))))
 
 
diff --git a/test/lisp/vc/vc-bzr-tests.el b/test/lisp/vc/vc-bzr-tests.el
index b68a6945129..408d6e8e23d 100644
--- a/test/lisp/vc/vc-bzr-tests.el
+++ b/test/lisp/vc/vc-bzr-tests.el
@@ -131,7 +131,6 @@
                  (make-directory bzrdir)
                  (expand-file-name "foo.el" bzrdir)))
          (default-directory (file-name-as-directory bzrdir))
-         (generated-autoload-file (expand-file-name "loaddefs.el" bzrdir))
          (process-environment (cons (format "HOME=%s" homedir)
                                     process-environment)))
     (unwind-protect
@@ -148,7 +147,9 @@
           ;; causes bzr status to fail.  This simulates a broken bzr
           ;; installation.
           (delete-file ".bzr/checkout/dirstate")
-          (should (progn (update-directory-autoloads default-directory)
+          (should (progn (make-directory-autoloads
+                          default-directory
+                          (expand-file-name "loaddefs.el" bzrdir))
                          t)))
       (delete-directory homedir t))))
 
diff --git a/test/lisp/wdired-tests.el b/test/lisp/wdired-tests.el
index b89e8c876e2..f876967bf98 100644
--- a/test/lisp/wdired-tests.el
+++ b/test/lisp/wdired-tests.el
@@ -178,6 +178,22 @@ wdired-get-filename before and after editing."
       (server-force-delete)
       (delete-directory test-dir t))))
 
+(ert-deftest wdired-test-bug39280 ()
+  "Test for https://debbugs.gnu.org/39280."
+  (let* ((test-dir (make-temp-file "test-dir" 'dir))
+         (fname "foo")
+         (full-fname (expand-file-name fname test-dir)))
+    (make-empty-file full-fname)
+    (let ((buf (find-file-noselect test-dir)))
+      (unwind-protect
+	  (with-current-buffer buf
+	    (dired-toggle-read-only)
+            (dolist (old '(t nil))
+              (should (equal fname (wdired-get-filename 'nodir old)))
+              (should (equal full-fname (wdired-get-filename nil old))))
+	    (wdired-finish-edit))
+	(if buf (kill-buffer buf))
+	(delete-directory test-dir t)))))
 
 (provide 'wdired-tests)
 ;;; wdired-tests.el ends here
diff --git a/test/manual/cedet/tests/testnsp.cpp b/test/manual/cedet/tests/testnsp.cpp
index fce707bf20b..b72a44c8ca8 100644
--- a/test/manual/cedet/tests/testnsp.cpp
+++ b/test/manual/cedet/tests/testnsp.cpp
@@ -93,7 +93,7 @@ void foo(void) {
     ; // #4# ( "Mumble" "get" )
 }
 
-// What happens if a type your looking for is scoped withing a type,
+// What happens if a type your looking for is scoped within a type,
 // but you are one level into the completion so the originating scope
 // excludes the type of the variable you are completing through?
 // Thanks Martin Stein for this nice example.
diff --git a/test/src/coding-tests.el b/test/src/coding-tests.el
index c438ae22ce3..82883a045c8 100644
--- a/test/src/coding-tests.el
+++ b/test/src/coding-tests.el
@@ -143,7 +143,7 @@
 ;; Optional 5th arg TRANSLATOR is a function to translate the original
 ;; file contents to match with the expected result of decoding.  For
 ;; instance, when a file of dos eol-type is read by unix eol-type,
-;; `decode-test-lf-to-crlf' must be specified.
+;; `coding-tests-lf-to-crlf' must be specified.
 
 (defun coding-tests (content-type write-coding read-coding detected-coding
 				   &optional translator)
diff --git a/test/src/indent-tests.el b/test/src/indent-tests.el
new file mode 100644
index 00000000000..7d1a6ce6dc3
--- /dev/null
+++ b/test/src/indent-tests.el
@@ -0,0 +1,59 @@
+;;; indent-tests.el --- tests for src/indent.c  -*- lexical-binding:t -*-
+
+;; Copyright (C) 2020 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; This program is free software: you can redistribute it and/or
+;; modify it under the terms of the GNU General Public License as
+;; published by the Free Software Foundation, either version 3 of the
+;; License, or (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;; General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see `https://www.gnu.org/licenses/'.
+
+;;; Commentary:
+
+;;; Code:
+
+(ert-deftest indent-tests-move-to-column-invis-1tab ()
+  "Test `move-to-column' when a TAB is followed by invisible text."
+  (should
+   (string=
+    (with-temp-buffer
+      (insert "\tLine starting with INVISIBLE text after TAB\n")
+      (add-text-properties 2 21 '(invisible t))
+      (goto-char (point-min))
+      (move-to-column 7 t)
+      (buffer-substring-no-properties 1 8))
+    "       ")))
+
+(ert-deftest indent-tests-move-to-column-invis-2tabs ()
+  "Test `move-to-column' when 2 TABs are followed by invisible text."
+  (should
+   (string=
+    (with-temp-buffer
+      (insert "\t\tLine starting with INVISIBLE text after TAB\n")
+      (add-text-properties 3 22 '(invisible t))
+      (goto-char (point-min))
+      (move-to-column 12 t)
+      (buffer-substring-no-properties 1 11))
+    "\t    \tLine")))
+
+(ert-deftest indent-tests-move-to-column-invis-between-tabs ()
+  "Test `move-to-column' when 2 TABs are mixed with invisible text."
+  (should
+   (string=
+    (with-temp-buffer
+      (insert "\txxx\tLine starting with INVISIBLE text after TAB\n")
+      (add-text-properties 6 25 '(invisible t))
+      (add-text-properties 2 5 '(invisible t))
+      (goto-char (point-min))
+      (move-to-column 12 t)
+      (buffer-substring-no-properties 1 14))
+    "\txxx    \tLine")))
diff --git a/test/src/regex-resources/BOOST.tests b/test/src/regex-resources/BOOST.tests
index 98fd3b6abf3..756fa00486b 100644
--- a/test/src/regex-resources/BOOST.tests
+++ b/test/src/regex-resources/BOOST.tests
@@ -93,7 +93,7 @@ aa\) !
 . \0 0 1
 
 ;
-; now move on to the repetion ops,
+; now move on to the repetition ops,
 ; starting with operator *
 - match_default normal REG_EXTENDED
 a* b 0 0
@@ -275,7 +275,7 @@ a(b*)c\1d abbcbbbd -1 -1
 ^(.)\1 abc -1 -1
 a([bc])\1d abcdabbd	4 8 5 6
 ; strictly speaking this is at best ambiguous, at worst wrong, this is what most
-; re implimentations will match though.
+; re implementations will match though.
 a(([bc])\2)*d abbccd 0 6 3 5 3 4
 
 a(([bc])\2)*d abbcbd -1 -1
diff --git a/test/src/syntax-tests.el b/test/src/syntax-tests.el
index 65c56b3b29d..56e03380579 100644
--- a/test/src/syntax-tests.el
+++ b/test/src/syntax-tests.el
@@ -82,4 +82,353 @@ also has open paren syntax (see Bug#24870)."
       (should (equal (parse-partial-sexp pointC pointX nil nil ppsC)
                      ppsX)))))
 
+
+;;; Commentary:
+;; The next bit tests the handling of comments in syntax.c, in
+;; particular the functions `forward-comment' and `scan-lists' and
+;; `parse-partial-sexp' (in so far as they relate to comments).
+
+;; It is intended to enhance this bit to test nested comments
+;; (2020-10-01).
+
+;; This bit uses the data file test/data/syntax-comments.txt.
+
+(defun syntax-comments-point (n forw)
+  "Return the buffer offset corresponding to the \"label\" N.
+N is a decimal number which appears in the data file, usually
+twice, as \"labels\".  It can also be a negative number or zero.
+FORW is t when we're using the label at BOL, nil for the one at EOL.
+
+If the label N doesn't exist in the current buffer, an exception
+is thrown.
+
+When FORW is t and N positive, we return the position after the
+first occurrence of label N at BOL in the data file.  With FORW
+nil, we return the position before the last occurrence of the
+label at EOL in the data file.
+
+When N is negative, we return instead the position of the end of
+line that the -N label is on.  When it is zero, we return POINT."
+  (if (zerop n)
+      (point)
+    (let ((str (format "%d" (abs n))))
+      (save-excursion
+	(if forw
+	    (progn
+	      (goto-char (point-min))
+	      (re-search-forward
+	       (concat "^\\(" str "\\)\\([^0-9\n]\\|$\\)"))
+	      (if (< n 0)
+		  (progn (end-of-line) (point))
+		(match-end 1)))
+	  (goto-char (point-max))
+	  (re-search-backward
+	   (concat "\\(^\\|[^0-9]\\)\\(" str "\\)$"))
+	  (if (< n 0)
+	      (progn (end-of-line) (point))
+	    (match-beginning 2)))))))
+
+(defun syntax-comments-midpoint (n)
+  "Return the buffer offset corresponding to the \"label\" N.
+N is a positive decimal number which should appear in the buffer
+exactly once.  The label need not be at the beginning or end of a
+line.
+
+The return value is the position just before the label.
+
+If the label N doesn't exist in the current buffer, an exception
+is thrown."
+  (let ((str (format "%d" n)))
+    (save-excursion
+      (goto-char (point-min))
+      (re-search-forward
+       (concat "\\(^\\|[^0-9]\\)\\(" str "\\)\\([^0-9\n]\\|$\\)"))
+      (match-beginning 2))))
+
+(eval-and-compile
+  (defvar syntax-comments-section))
+
+(defmacro syntax-comments (-type- -dir- res start &optional stop)
+  "Create an ERT test to test (forward-comment 1/-1).
+The test uses a fixed name data file, which it visits.  It calls
+entry and exit functions to set up and tear down syntax entries
+for comment characters.  The test is given a name based on the
+global variable `syntax-comments-section', the direction of
+movement and the value of START.
+
+-TYPE- (unquoted) is a symbol from whose name the entry and exit
+function names are derived by appending \"-in\" and \"-out\".
+
+-DIR- (unquoted) is `forward' or `backward', the direction
+`forward-comment' is attempted.
+
+RES, t or nil, is the expected result from `forward-comment'.
+
+START and STOP are decimal numbers corresponding to labels in the
+data file marking the start and expected stop positions.  See
+`syntax-comments-point' for a precise specification.  If STOP is
+missing or nil, the value of START is assumed for it."
+  (declare (debug t))
+  (let ((forw
+	 (cond
+	  ((eq -dir- 'forward) t)
+	  ((eq -dir- 'backward) nil)
+	  (t (error "Invalid -dir- argument \"%s\" to `syntax-comments'" -dir-))))
+	(start-str (format "%d" (abs start)))
+	(type -type-))
+    `(ert-deftest ,(intern (concat "syntax-comments-"
+				   syntax-comments-section
+				   (if forw "-f" "-b") start-str))
+	 ()
+       (with-current-buffer
+	   (find-file
+	    ,(expand-file-name "data/syntax-comments.txt"
+			       (getenv "EMACS_TEST_DIRECTORY")))
+	 (,(intern (concat (symbol-name type) "-in")))
+	 (goto-char (syntax-comments-point ,start ,forw))
+	 (let ((stop (syntax-comments-point ,(or stop start) ,(not forw))))
+	   (should (eq (forward-comment ,(if forw 1 -1)) ,res))
+	   (should (eq (point) stop)))
+	 (,(intern (concat (symbol-name type) "-out")))))))
+
+(defmacro syntax-br-comments (-type- -dir- res -start- &optional stop)
+  "Create an ERT test to test (scan-lists <position> 1/-1 0).
+This is to test the interface between scan-lists and the internal
+comment routines in syntax.c.
+
+The test uses a fixed name data file, which it visits.  It calls
+entry and exit functions to set up and tear down syntax entries
+for comment and paren characters.  The test is given a name based
+on the global variable `syntax-comments-section', the direction
+of movement and the value of -START-.
+
+-TYPE- (unquoted) is a symbol from whose name the entry and exit
+function names are derived by appending \"-in\" and \"-out\".
+
+-DIR- (unquoted) is `forward' or `backward', the direction
+`scan-lists' is attempted.
+
+RES is t if `scan-lists' is expected to return, nil if it is
+expected to raise a `scan-error' exception.
+
+-START- and STOP are decimal numbers corresponding to labels in the
+data file marking the start and expected stop positions.  See
+`syntax-comments-point' for a precise specification.  If STOP is
+missing or nil, the value of -START- is assumed for it."
+  (declare (debug t))
+  (let* ((forw
+	  (cond
+	   ((eq -dir- 'forward) t)
+	   ((eq -dir- 'backward) nil)
+	   (t (error "Invalid -dir- argument \"%s\" to `syntax-comments'" -dir-))))
+         (start -start-)
+	 (start-str (format "%d" (abs start)))
+	 (type -type-))
+    `(ert-deftest ,(intern (concat "syntax-br-comments-"
+				   syntax-comments-section
+				   (if forw "-f" "-b") start-str))
+	 ()
+       (with-current-buffer
+	   (find-file
+	    ,(expand-file-name "data/syntax-comments.txt"
+			       (getenv "EMACS_TEST_DIRECTORY")))
+	 (,(intern (concat (symbol-name type) "-in")))
+         (let ((start-pos (syntax-comments-point ,start ,forw))
+               ,@(if res
+                     `((stop-pos (syntax-comments-point
+                                  ,(or stop start) ,(not forw))))))
+           ,(if res
+                `(should
+                  (eq (scan-lists start-pos ,(if forw 1 -1) 0)
+                      stop-pos))
+              `(should-error (scan-lists start-pos ,(if forw 1 -1) 0)
+                             :type 'scan-error)))
+	 (,(intern (concat (symbol-name type) "-out")))))))
+
+(defmacro syntax-pps-comments (-type- -start- open close &optional -stop-)
+  "Create an ERT test to test `parse-partial-sexp' with comments.
+This is to test the interface between `parse-partial-sexp' and
+the internal comment routines in syntax.c.
+
+The test uses a fixed name data file, which it visits.  It calls
+entry and exit functions to set up and tear down syntax entries
+for comment and paren characters.  The test is given a name based
+on the global variable `syntax-comments-section', and the value
+of -START-.
+
+The generated test calls `parse-partial-sexp' three times, the
+first two with COMMENTSTOP set to `syntax-table' so as to stop
+after the start and end of the comment.  The third call is
+expected to stop at the brace/paren matching the one where the
+test started.
+
+-TYPE- (unquoted) is a symbol from whose name the entry and exit
+function names are derived by appending \"-in\" and \"-out\".
+
+-START- and -STOP- are decimal numbers corresponding to labels in
+the data file marking the start and expected stop positions.  See
+`syntax-comments-point' for a precise specification.  If -STOP-
+is missing or nil, the value of -START- is assumed for it.
+
+OPEN and CLOSE are decimal numbers corresponding to labels in the
+data file marking just after the comment opener and closer where
+the `parse-partial-sexp's are expected to stop.  See
+`syntax-comments-midpoint' for a precise specification."
+  (declare (debug t))
+  (let* ((type -type-)
+         (start -start-)
+         (start-str (format "%d" start))
+         (stop (or -stop- start)))
+    `(ert-deftest ,(intern (concat "syntax-pps-comments-"
+                                   syntax-comments-section
+                                   "-" start-str))
+         ()
+       (with-current-buffer
+           (find-file
+            ,(expand-file-name "data/syntax-comments.txt"
+                               (getenv "EMACS_TEST_DIRECTORY")))
+         (,(intern (concat (symbol-name type) "-in")))
+         (let ((start-pos (syntax-comments-point ,start t))
+               (open-pos (syntax-comments-midpoint ,open))
+               (close-pos (syntax-comments-midpoint ,close))
+               (stop-pos (syntax-comments-point ,stop nil))
+               s)
+           (setq s (parse-partial-sexp
+                    start-pos (point-max) 0 nil nil 'syntax-table))
+           (should (eq (point) open-pos))
+           (setq s (parse-partial-sexp
+                    (point) (point-max) 0 nil s 'syntax-table))
+           (should (eq (point) close-pos))
+           (setq s (parse-partial-sexp (point) (point-max) 0 nil s))
+           (should (eq (point) stop-pos)))
+         (,(intern (concat (symbol-name type) "-out")))))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; "Pascal" style comments - single character delimiters, the closing
+;; delimiter not being newline.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+(defun {-in ()
+  (setq parse-sexp-ignore-comments t)
+  (setq comment-end-can-be-escaped nil)
+  (modify-syntax-entry ?{ "<")
+  (modify-syntax-entry ?} ">"))
+(defun {-out ()
+  (modify-syntax-entry ?{ "(}")
+  (modify-syntax-entry ?} "){"))
+(eval-and-compile
+  (setq syntax-comments-section "pascal"))
+
+(syntax-comments { forward nil 20 0)
+(syntax-comments { backward nil 20 0)
+(syntax-comments { forward t 21)
+(syntax-comments { backward t 21)
+(syntax-comments { forward t 22)
+(syntax-comments { backward t 22)
+
+(syntax-comments { forward t 23)
+(syntax-comments { backward t 23)
+(syntax-comments { forward t 24)
+(syntax-comments { backward t 24)
+(syntax-comments { forward t 26)
+(syntax-comments { backward t 26)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; "Lisp" style comments - single character opening delimiters on line
+;; comments.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+(defun \;-in ()
+  (setq parse-sexp-ignore-comments t)
+  (setq comment-end-can-be-escaped nil)
+  (modify-syntax-entry ?\n ">")
+  (modify-syntax-entry ?\; "<"))
+(defun \;-out ()
+  (modify-syntax-entry ?\n " ")
+  (modify-syntax-entry ?\; "."))
+(eval-and-compile
+  (setq syntax-comments-section "lisp"))
+
+(syntax-comments \; backward nil 30 30)
+(syntax-comments \; forward t 31)
+(syntax-comments \; backward t 31)
+(syntax-comments \; forward t 32)
+(syntax-comments \; backward t 32)
+(syntax-comments \; forward t 33)
+(syntax-comments \; backward t 33)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Emacs 27 "C" style comments - `comment-end-can-be-escaped' is non-nil.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+(defun /*-in ()
+  (setq parse-sexp-ignore-comments t)
+  (setq comment-end-can-be-escaped t)
+  (modify-syntax-entry ?/ ". 124b")
+  (modify-syntax-entry ?* ". 23")
+  (modify-syntax-entry ?\n "> b"))
+(defun /*-out ()
+  (setq comment-end-can-be-escaped nil)
+  (modify-syntax-entry ?/ ".")
+  (modify-syntax-entry ?* ".")
+  (modify-syntax-entry ?\n " "))
+(eval-and-compile
+  (setq syntax-comments-section "c"))
+
+(syntax-comments /* forward t 1)
+(syntax-comments /* backward t 1)
+(syntax-comments /* forward t 2)
+(syntax-comments /* backward t 2)
+(syntax-comments /* forward t 3)
+(syntax-comments /* backward t 3)
+
+(syntax-comments /* forward t 4)
+(syntax-comments /* backward t 4)
+(syntax-comments /* forward t 5 6)
+(syntax-comments /* backward nil 5 0)
+(syntax-comments /* forward nil 6 0)
+(syntax-comments /* backward t 6 5)
+
+(syntax-comments /* forward t 7 8)
+(syntax-comments /* backward nil 7 0)
+(syntax-comments /* forward nil 8 0)
+(syntax-comments /* backward t 8 7)
+(syntax-comments /* forward t 9)
+(syntax-comments /* backward t 9)
+
+(syntax-comments /* forward nil 10 0)
+(syntax-comments /* backward nil 10 0)
+(syntax-comments /* forward t 11)
+(syntax-comments /* backward t 11)
+
+(syntax-comments /* forward t 13 14)
+(syntax-comments /* backward nil 13 -14)
+(syntax-comments /* forward t 15)
+(syntax-comments /* backward t 15)
+
+;; Emacs 27 "C" style comments inside brace lists.
+(syntax-br-comments /* forward t 50)
+(syntax-br-comments /* backward t 50)
+(syntax-br-comments /* forward t 51)
+(syntax-br-comments /* backward t 51)
+(syntax-br-comments /* forward t 52)
+(syntax-br-comments /* backward t 52)
+
+(syntax-br-comments /* forward t 53)
+(syntax-br-comments /* backward t 53)
+(syntax-br-comments /* forward t 54 20)
+(syntax-br-comments /* backward t 54)
+(syntax-br-comments /* forward t 55)
+(syntax-br-comments /* backward t 55)
+
+(syntax-br-comments /* forward t 56 58)
+(syntax-br-comments /* backward t 58 56)
+(syntax-br-comments /* backward nil 59)
+(syntax-br-comments /* forward t 60)
+(syntax-br-comments /* backward t 60)
+
+;; Emacs 27 "C" style comments parsed by `parse-partial-sexp'.
+(syntax-pps-comments /* 50 70 71)
+(syntax-pps-comments /* 52 72 73)
+(syntax-pps-comments /* 54 74 55 20)
+(syntax-pps-comments /* 56 76 77 58)
+(syntax-pps-comments /* 60 78 79)
+
 ;;; syntax-tests.el ends here