[6.0.x] Applied Black's 2026 stable style.

https://github.com/psf/black/releases/tag/26.1.0

Backport of 6cff02078799b7c683a0d39630d49ab4fe532e7c from main.

25 files changed, 137 insertions, 268 deletions

diff --git a/tests/auth_tests/test_forms.py b/tests/auth_tests/test_forms.py
index 73065adddf..983fe8c39e 100644
--- a/tests/auth_tests/test_forms.py
+++ b/tests/auth_tests/test_forms.py
@@ -1234,7 +1234,7 @@ class PasswordResetFormTest(TestDataMixin, TestCase):
         self.assertEqual(len(mail.outbox), 0)
 
     def test_cleaned_data(self):
-        (user, username, email) = self.create_dummy_user()
+        user, username, email = self.create_dummy_user()
         data = {"email": email}
         form = PasswordResetForm(data)
         self.assertTrue(form.is_valid())
@@ -1303,7 +1303,7 @@ class PasswordResetFormTest(TestDataMixin, TestCase):
         """
         Inactive user cannot receive password reset email.
         """
-        (user, username, email) = self.create_dummy_user()
+        user, username, email = self.create_dummy_user()
         user.is_active = False
         user.save()
         form = PasswordResetForm({"email": email})
@@ -1330,7 +1330,7 @@ class PasswordResetFormTest(TestDataMixin, TestCase):
         html_email_template_name parameter passed in. Test to ensure original
         behavior is unchanged after the parameter was added.
         """
-        (user, username, email) = self.create_dummy_user()
+        user, username, email = self.create_dummy_user()
         form = PasswordResetForm({"email": email})
         self.assertTrue(form.is_valid())
         form.save()
@@ -1352,7 +1352,7 @@ class PasswordResetFormTest(TestDataMixin, TestCase):
         Test to ensure that a multipart email is sent with both text/plain
         and text/html parts.
         """
-        (user, username, email) = self.create_dummy_user()
+        user, username, email = self.create_dummy_user()
         form = PasswordResetForm({"email": email})
         self.assertTrue(form.is_valid())
         form.save(
@@ -1382,7 +1382,7 @@ class PasswordResetFormTest(TestDataMixin, TestCase):
 
     @override_settings(EMAIL_BACKEND="mail.custombackend.FailingEmailBackend")
     def test_save_send_email_exceptions_are_catched_and_logged(self):
-        (user, username, email) = self.create_dummy_user()
+        user, username, email = self.create_dummy_user()
         form = PasswordResetForm({"email": email})
         self.assertTrue(form.is_valid())
 
diff --git a/tests/backends/mysql/test_introspection.py b/tests/backends/mysql/test_introspection.py
index a2e2938451..55272989d2 100644
--- a/tests/backends/mysql/test_introspection.py
+++ b/tests/backends/mysql/test_introspection.py
@@ -81,19 +81,16 @@ class TestCrossDatabaseRelations(TestCase):
         rel_column_quoted = other_connection.ops.quote_name(rel_column)
         try:
             with other_connection.cursor() as other_cursor:
-                other_cursor.execute(
-                    f"""
+                other_cursor.execute(f"""
                     CREATE TABLE {rel_table_quoted} (
                         id integer AUTO_INCREMENT,
                         PRIMARY KEY (id)
                     )
-                    """
-                )
+                    """)
             with default_connection.cursor() as default_cursor:
                 # Create table in the default schema with a cross-database
                 # relation.
-                default_cursor.execute(
-                    f"""
+                default_cursor.execute(f"""
                     CREATE TABLE {main_table_quoted} (
                         id integer AUTO_INCREMENT,
                         {rel_column_quoted} integer NOT NULL,
@@ -101,8 +98,7 @@ class TestCrossDatabaseRelations(TestCase):
                         FOREIGN KEY ({rel_column_quoted})
                         REFERENCES {other_schema_quoted}.{rel_table_quoted}(id)
                     )
-                    """
-                )
+                    """)
                 relations = default_connection.introspection.get_relations(
                     default_cursor, main_table
                 )
diff --git a/tests/csrf_tests/views.py b/tests/csrf_tests/views.py
index 2e8f0fcb0f..3949aeaea1 100644
--- a/tests/csrf_tests/views.py
+++ b/tests/csrf_tests/views.py
@@ -62,13 +62,11 @@ def sandwiched_rotate_token_view(request):
 
 def post_form_view(request):
     """Return a POST form (without a token)."""
-    return HttpResponse(
-        content="""
+    return HttpResponse(content="""
 <html>
 <body><h1>\u00a1Unicode!<form method="post"><input type="text"></form></body>
 </html>
-"""
-    )
+""")
 
 
 def token_view(request):
diff --git a/tests/forms_tests/tests/test_forms.py b/tests/forms_tests/tests/test_forms.py
index 5b0c4b9a04..04867cdf8e 100644
--- a/tests/forms_tests/tests/test_forms.py
+++ b/tests/forms_tests/tests/test_forms.py
@@ -3664,7 +3664,8 @@ Options: <select multiple name="options" aria-invalid="true" required>
         self.assertTrue(f.is_valid())
 
         file1 = SimpleUploadedFile(
-            "我隻氣墊船裝滿晒鱔.txt", "मेरी मँडराने वाली नाव सर्पमीनों से भरी ह".encode()
+            "我隻氣墊船裝滿晒鱔.txt",
+            "मेरी मँडराने वाली नाव सर्पमीनों से भरी ह".encode(),
         )
         f = FileForm(data={}, files={"file1": file1}, auto_id=False)
         self.assertHTMLEqual(
diff --git a/tests/forms_tests/tests/tests.py b/tests/forms_tests/tests/tests.py
index 866faaac4d..253e34976a 100644
--- a/tests/forms_tests/tests/tests.py
+++ b/tests/forms_tests/tests/tests.py
@@ -250,7 +250,8 @@ class FormsModelTestCase(TestCase):
     def test_unicode_filename(self):
         # FileModel with Unicode filename and data.
         file1 = SimpleUploadedFile(
-            "我隻氣墊船裝滿晒鱔.txt", "मेरी मँडराने वाली नाव सर्पमीनों से भरी ह".encode()
+            "我隻氣墊船裝滿晒鱔.txt",
+            "मेरी मँडराने वाली नाव सर्पमीनों से भरी ह".encode(),
         )
         f = FileForm(data={}, files={"file1": file1}, auto_id=False)
         self.assertTrue(f.is_valid())
diff --git a/tests/forms_tests/widget_tests/test_clearablefileinput.py b/tests/forms_tests/widget_tests/test_clearablefileinput.py
index ae54cc4b5d..31ff1af624 100644
--- a/tests/forms_tests/widget_tests/test_clearablefileinput.py
+++ b/tests/forms_tests/widget_tests/test_clearablefileinput.py
@@ -29,14 +29,12 @@ class ClearableFileInputTest(WidgetTest):
             self.widget,
             "myfile",
             FakeFieldFile(),
-            html=(
-                """
+            html=("""
             Currently: <a href="something">something</a>
             <input type="checkbox" name="myfile-clear" id="myfile-clear_id">
             <label for="myfile-clear_id">Clear</label><br>
             Change: <input type="file" name="myfile">
-            """
-            ),
+            """),
         )
 
     def test_html_escaped(self):
@@ -55,8 +53,7 @@ class ClearableFileInputTest(WidgetTest):
             ClearableFileInput(),
             "my<div>file",
             StrangeFieldFile(),
-            html=(
-                """
+            html=("""
                 Currently:
                 <a href="something?chapter=1&amp;sect=2&amp;copy=3&amp;lang=en">
                 something&lt;div onclick=&quot;alert(&#x27;oops&#x27;)&quot;&gt;.jpg</a>
@@ -64,8 +61,7 @@ class ClearableFileInputTest(WidgetTest):
                     id="my&lt;div&gt;file-clear_id">
                 <label for="my&lt;div&gt;file-clear_id">Clear</label><br>
                 Change: <input type="file" name="my&lt;div&gt;file">
-                """
-            ),
+                """),
         )
 
     def test_clear_input_renders_only_if_not_required(self):
@@ -79,12 +75,10 @@ class ClearableFileInputTest(WidgetTest):
             widget,
             "myfile",
             FakeFieldFile(),
-            html=(
-                """
+            html=("""
             Currently: <a href="something">something</a> <br>
             Change: <input type="file" name="myfile">
-            """
-            ),
+            """),
         )
 
     def test_clear_input_renders_only_if_initial(self):
@@ -143,14 +137,12 @@ class ClearableFileInputTest(WidgetTest):
             widget,
             "myfile",
             [FakeFieldFile()],
-            html=(
-                """
+            html=("""
             Currently: <a href="something">something</a>
             <input type="checkbox" name="myfile_0-clear" id="myfile_0-clear_id">
             <label for="myfile_0-clear_id">Clear</label><br>
             Change: <input type="file" name="myfile_0">
-            """
-            ),
+            """),
         )
 
     def test_clear_input_checked_returns_false(self):
diff --git a/tests/forms_tests/widget_tests/test_multiwidget.py b/tests/forms_tests/widget_tests/test_multiwidget.py
index 40f099e625..5e360e3e92 100644
--- a/tests/forms_tests/widget_tests/test_multiwidget.py
+++ b/tests/forms_tests/widget_tests/test_multiwidget.py
@@ -273,8 +273,7 @@ class MultiWidgetTest(WidgetTest):
             widget,
             "name",
             "some text,JP,2007-04-25 06:24:00",
-            html=(
-                """
+            html=("""
             <input type="text" name="name_0" value="some text">
             <select multiple name="name_1">
                 <option value="J" selected>John</option>
@@ -284,8 +283,7 @@ class MultiWidgetTest(WidgetTest):
             </select>
             <input type="text" name="name_2_0" value="2007-04-25">
             <input type="text" name="name_2_1" value="06:24:00">
-            """
-            ),
+            """),
         )
 
     def test_no_whitespace_between_widgets(self):
diff --git a/tests/forms_tests/widget_tests/test_nullbooleanselect.py b/tests/forms_tests/widget_tests/test_nullbooleanselect.py
index 307ae56579..705ec6ce06 100644
--- a/tests/forms_tests/widget_tests/test_nullbooleanselect.py
+++ b/tests/forms_tests/widget_tests/test_nullbooleanselect.py
@@ -12,13 +12,11 @@ class NullBooleanSelectTest(WidgetTest):
             self.widget,
             "is_cool",
             True,
-            html=(
-                """<select name="is_cool">
+            html=("""<select name="is_cool">
             <option value="unknown">Unknown</option>
             <option value="true" selected>Yes</option>
             <option value="false">No</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_render_false(self):
@@ -26,13 +24,11 @@ class NullBooleanSelectTest(WidgetTest):
             self.widget,
             "is_cool",
             False,
-            html=(
-                """<select name="is_cool">
+            html=("""<select name="is_cool">
             <option value="unknown">Unknown</option>
             <option value="true">Yes</option>
             <option value="false" selected>No</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_render_none(self):
@@ -40,13 +36,11 @@ class NullBooleanSelectTest(WidgetTest):
             self.widget,
             "is_cool",
             None,
-            html=(
-                """<select name="is_cool">
+            html=("""<select name="is_cool">
             <option value="unknown" selected>Unknown</option>
             <option value="true">Yes</option>
             <option value="false">No</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_render_value_unknown(self):
@@ -54,13 +48,11 @@ class NullBooleanSelectTest(WidgetTest):
             self.widget,
             "is_cool",
             "unknown",
-            html=(
-                """<select name="is_cool">
+            html=("""<select name="is_cool">
             <option value="unknown" selected>Unknown</option>
             <option value="true">Yes</option>
             <option value="false">No</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_render_value_true(self):
@@ -68,13 +60,11 @@ class NullBooleanSelectTest(WidgetTest):
             self.widget,
             "is_cool",
             "true",
-            html=(
-                """<select name="is_cool">
+            html=("""<select name="is_cool">
             <option value="unknown">Unknown</option>
             <option value="true" selected>Yes</option>
             <option value="false">No</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_render_value_false(self):
@@ -82,13 +72,11 @@ class NullBooleanSelectTest(WidgetTest):
             self.widget,
             "is_cool",
             "false",
-            html=(
-                """<select name="is_cool">
+            html=("""<select name="is_cool">
             <option value="unknown">Unknown</option>
             <option value="true">Yes</option>
             <option value="false" selected>No</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_render_value_1(self):
@@ -96,13 +84,11 @@ class NullBooleanSelectTest(WidgetTest):
             self.widget,
             "is_cool",
             "1",
-            html=(
-                """<select name="is_cool">
+            html=("""<select name="is_cool">
             <option value="unknown" selected>Unknown</option>
             <option value="true">Yes</option>
             <option value="false">No</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_render_value_2(self):
@@ -110,13 +96,11 @@ class NullBooleanSelectTest(WidgetTest):
             self.widget,
             "is_cool",
             "2",
-            html=(
-                """<select name="is_cool">
+            html=("""<select name="is_cool">
             <option value="unknown">Unknown</option>
             <option value="true" selected>Yes</option>
             <option value="false">No</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_render_value_3(self):
@@ -124,13 +108,11 @@ class NullBooleanSelectTest(WidgetTest):
             self.widget,
             "is_cool",
             "3",
-            html=(
-                """<select name="is_cool">
+            html=("""<select name="is_cool">
             <option value="unknown">Unknown</option>
             <option value="true">Yes</option>
             <option value="false" selected>No</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_l10n(self):
@@ -144,15 +126,13 @@ class NullBooleanSelectTest(WidgetTest):
                 widget,
                 "id_bool",
                 True,
-                html=(
-                    """
+                html=("""
                 <select name="id_bool">
                     <option value="unknown">Unbekannt</option>
                     <option value="true" selected>Ja</option>
                     <option value="false">Nein</option>
                 </select>
-                """
-                ),
+                """),
             )
 
     def test_fieldset(self):
diff --git a/tests/forms_tests/widget_tests/test_select.py b/tests/forms_tests/widget_tests/test_select.py
index 6164d0b6b3..884b768086 100644
--- a/tests/forms_tests/widget_tests/test_select.py
+++ b/tests/forms_tests/widget_tests/test_select.py
@@ -31,14 +31,12 @@ class SelectTest(ChoiceWidgetTest):
             self.widget(choices=self.beatles),
             "beatle",
             None,
-            html=(
-                """<select name="beatle">
+            html=("""<select name="beatle">
             <option value="J">John</option>
             <option value="P">Paul</option>
             <option value="G">George</option>
             <option value="R">Ringo</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_render_label_value(self):
@@ -50,14 +48,12 @@ class SelectTest(ChoiceWidgetTest):
             self.widget(choices=self.beatles),
             "beatle",
             "John",
-            html=(
-                """<select name="beatle">
+            html=("""<select name="beatle">
             <option value="J">John</option>
             <option value="P">Paul</option>
             <option value="G">George</option>
             <option value="R">Ringo</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_render_selected(self):
@@ -70,15 +66,13 @@ class SelectTest(ChoiceWidgetTest):
             self.widget(choices=choices),
             "choices",
             "0",
-            html=(
-                """<select name="choices">
+            html=("""<select name="choices">
             <option value="0" selected>0</option>
             <option value="1">1</option>
             <option value="2">2</option>
             <option value="3">3</option>
             <option value="0">extra</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_constructor_attrs(self):
@@ -93,13 +87,11 @@ class SelectTest(ChoiceWidgetTest):
             widget,
             "num",
             2,
-            html=(
-                """<select name="num" class="super" id="super">
+            html=("""<select name="num" class="super" id="super">
               <option value="1">1</option>
               <option value="2" selected>2</option>
               <option value="3">3</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_compare_to_str(self):
@@ -110,37 +102,31 @@ class SelectTest(ChoiceWidgetTest):
             self.widget(choices=[("1", "1"), ("2", "2"), ("3", "3")]),
             "num",
             2,
-            html=(
-                """<select name="num">
+            html=("""<select name="num">
                 <option value="1">1</option>
                 <option value="2" selected>2</option>
                 <option value="3">3</option>
-                </select>"""
-            ),
+                </select>"""),
         )
         self.check_html(
             self.widget(choices=[(1, 1), (2, 2), (3, 3)]),
             "num",
             "2",
-            html=(
-                """<select name="num">
+            html=("""<select name="num">
                 <option value="1">1</option>
                 <option value="2" selected>2</option>
                 <option value="3">3</option>
-                </select>"""
-            ),
+                </select>"""),
         )
         self.check_html(
             self.widget(choices=[(1, 1), (2, 2), (3, 3)]),
             "num",
             2,
-            html=(
-                """<select name="num">
+            html=("""<select name="num">
                 <option value="1">1</option>
                 <option value="2" selected>2</option>
                 <option value="3">3</option>
-                </select>"""
-            ),
+                </select>"""),
         )
 
     def test_choices_constructor(self):
@@ -149,13 +135,11 @@ class SelectTest(ChoiceWidgetTest):
             widget,
             "num",
             2,
-            html=(
-                """<select name="num">
+            html=("""<select name="num">
             <option value="1">1</option>
             <option value="2" selected>2</option>
             <option value="3">3</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_choices_constructor_generator(self):
@@ -173,29 +157,25 @@ class SelectTest(ChoiceWidgetTest):
             widget,
             "num",
             2,
-            html=(
-                """<select name="num">
+            html=("""<select name="num">
             <option value="0">0</option>
             <option value="1">1</option>
             <option value="2" selected>2</option>
             <option value="3">3</option>
             <option value="4">4</option>
-            </select>"""
-            ),
+            </select>"""),
         )
         self.check_html(
             widget,
             "num",
             3,
-            html=(
-                """<select name="num">
+            html=("""<select name="num">
             <option value="0">0</option>
             <option value="1">1</option>
             <option value="2">2</option>
             <option value="3" selected>3</option>
             <option value="4">4</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_choices_escaping(self):
@@ -204,12 +184,10 @@ class SelectTest(ChoiceWidgetTest):
             self.widget(choices=choices),
             "escape",
             None,
-            html=(
-                """<select name="escape">
+            html=("""<select name="escape">
             <option value="bad">you &amp; me</option>
             <option value="good">you &gt; me</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_choices_unicode(self):
@@ -217,8 +195,7 @@ class SelectTest(ChoiceWidgetTest):
             self.widget(choices=[("ŠĐĆŽćžšđ", "ŠĐabcĆŽćžšđ"), ("ćžšđ", "abcćžšđ")]),
             "email",
             "ŠĐĆŽćžšđ",
-            html=(
-                """
+            html=("""
                 <select name="email">
                 <option value="\u0160\u0110\u0106\u017d\u0107\u017e\u0161\u0111"
                     selected>
@@ -227,8 +204,7 @@ class SelectTest(ChoiceWidgetTest):
                 <option value="\u0107\u017e\u0161\u0111">abc\u0107\u017e\u0161\u0111
                 </option>
                 </select>
-                """
-            ),
+                """),
         )
 
     def test_choices_optgroup(self):
@@ -429,8 +405,7 @@ class SelectTest(ChoiceWidgetTest):
             MultiWidget([self.widget(choices=choices), TextInput()]),
             "beatle",
             ["J", "Some text"],
-            html=(
-                """
+            html=("""
                 <select name="beatle_0">
                   <option value="">------</option>
                   <option value="J" selected>John</option>
@@ -439,8 +414,7 @@ class SelectTest(ChoiceWidgetTest):
                   <option value="R">Ringo</option>
                 </select>
                 <input name="beatle_1" type="text" value="Some text">
-                """
-            ),
+                """),
         )
 
     def test_fieldset(self):
diff --git a/tests/forms_tests/widget_tests/test_selectdatewidget.py b/tests/forms_tests/widget_tests/test_selectdatewidget.py
index 017e90f5f6..b4bbd23c2a 100644
--- a/tests/forms_tests/widget_tests/test_selectdatewidget.py
+++ b/tests/forms_tests/widget_tests/test_selectdatewidget.py
@@ -32,8 +32,7 @@ class SelectDateWidgetTest(WidgetTest):
             self.widget,
             "mydate",
             "",
-            html=(
-                """
+            html=("""
             <select name="mydate_month" id="id_mydate_month">
                 <option selected value="">---</option>
                 <option value="1">January</option>
@@ -98,8 +97,7 @@ class SelectDateWidgetTest(WidgetTest):
                 <option value="2015">2015</option>
                 <option value="2016">2016</option>
             </select>
-            """
-            ),
+            """),
         )
 
     def test_render_none(self):
@@ -116,8 +114,7 @@ class SelectDateWidgetTest(WidgetTest):
             self.widget,
             "mydate",
             "2010-04-15",
-            html=(
-                """
+            html=("""
             <select name="mydate_month" id="id_mydate_month">
                 <option value="">---</option>
                 <option value="1">January</option>
@@ -182,8 +179,7 @@ class SelectDateWidgetTest(WidgetTest):
                 <option value="2015">2015</option>
                 <option value="2016">2016</option>
             </select>
-            """
-            ),
+            """),
         )
 
     def test_render_datetime(self):
@@ -200,8 +196,7 @@ class SelectDateWidgetTest(WidgetTest):
             self.widget,
             "mydate",
             "2010-02-31",
-            html=(
-                """
+            html=("""
             <select name="mydate_month" id="id_mydate_month">
                 <option value="">---</option>
                 <option value="1">January</option>
@@ -266,8 +261,7 @@ class SelectDateWidgetTest(WidgetTest):
                 <option value="2015">2015</option>
                 <option value="2016">2016</option>
             </select>
-            """
-            ),
+            """),
         )
 
     def test_custom_months(self):
@@ -276,8 +270,7 @@ class SelectDateWidgetTest(WidgetTest):
             widget,
             "mydate",
             "",
-            html=(
-                """
+            html=("""
             <select name="mydate_month" id="id_mydate_month">
                 <option selected value="">---</option>
                 <option value="1">Jan.</option>
@@ -333,8 +326,7 @@ class SelectDateWidgetTest(WidgetTest):
                 <option selected value="">---</option>
                 <option value="2013">2013</option>
             </select>
-            """
-            ),
+            """),
         )
 
     def test_selectdate_required(self):
@@ -651,8 +643,7 @@ class SelectDateWidgetTest(WidgetTest):
             widget,
             "mydate",
             "",
-            html=(
-                """
+            html=("""
             <select name="mydate_month" id="id_mydate_month">
                 <option selected value="">---</option>
                 <option value="1">January</option>
@@ -706,8 +697,7 @@ class SelectDateWidgetTest(WidgetTest):
                 <option selected value="">---</option>
                 <option value="2007">2007</option>
             </select>
-            """
-            ),
+            """),
         )
 
     def test_fieldset(self):
diff --git a/tests/forms_tests/widget_tests/test_selectmultiple.py b/tests/forms_tests/widget_tests/test_selectmultiple.py
index c4fbea4490..e3dfee426d 100644
--- a/tests/forms_tests/widget_tests/test_selectmultiple.py
+++ b/tests/forms_tests/widget_tests/test_selectmultiple.py
@@ -18,14 +18,12 @@ class SelectMultipleTest(WidgetTest):
             self.widget(choices=self.beatles),
             "beatles",
             ["J"],
-            html=(
-                """<select multiple name="beatles">
+            html=("""<select multiple name="beatles">
             <option value="J" selected>John</option>
             <option value="P">Paul</option>
             <option value="G">George</option>
             <option value="R">Ringo</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_render_multiple_selected(self):
@@ -33,14 +31,12 @@ class SelectMultipleTest(WidgetTest):
             self.widget(choices=self.beatles),
             "beatles",
             ["J", "P"],
-            html=(
-                """<select multiple name="beatles">
+            html=("""<select multiple name="beatles">
             <option value="J" selected>John</option>
             <option value="P" selected>Paul</option>
             <option value="G">George</option>
             <option value="R">Ringo</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_render_none(self):
@@ -52,15 +48,13 @@ class SelectMultipleTest(WidgetTest):
             self.widget(choices=(("", "Unknown"),) + self.beatles),
             "beatles",
             None,
-            html=(
-                """<select multiple name="beatles">
+            html=("""<select multiple name="beatles">
             <option value="">Unknown</option>
             <option value="J">John</option>
             <option value="P">Paul</option>
             <option value="G">George</option>
             <option value="R">Ringo</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_render_value_label(self):
@@ -72,14 +66,12 @@ class SelectMultipleTest(WidgetTest):
             self.widget(choices=self.beatles),
             "beatles",
             ["John"],
-            html=(
-                """<select multiple name="beatles">
+            html=("""<select multiple name="beatles">
             <option value="J">John</option>
             <option value="P">Paul</option>
             <option value="G">George</option>
             <option value="R">Ringo</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_multiple_options_same_value(self):
@@ -90,15 +82,13 @@ class SelectMultipleTest(WidgetTest):
             self.widget(choices=self.numeric_choices),
             "choices",
             ["0"],
-            html=(
-                """<select multiple name="choices">
+            html=("""<select multiple name="choices">
             <option value="0" selected>0</option>
             <option value="1">1</option>
             <option value="2">2</option>
             <option value="3">3</option>
             <option value="0" selected>extra</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_multiple_values_invalid(self):
@@ -110,14 +100,12 @@ class SelectMultipleTest(WidgetTest):
             self.widget(choices=self.beatles),
             "beatles",
             ["J", "G", "foo"],
-            html=(
-                """<select multiple name="beatles">
+            html=("""<select multiple name="beatles">
             <option value="J" selected>John</option>
             <option value="P">Paul</option>
             <option value="G" selected>George</option>
             <option value="R">Ringo</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_compare_string(self):
@@ -127,39 +115,33 @@ class SelectMultipleTest(WidgetTest):
             self.widget(choices=choices),
             "nums",
             [2],
-            html=(
-                """<select multiple name="nums">
+            html=("""<select multiple name="nums">
             <option value="1">1</option>
             <option value="2" selected>2</option>
             <option value="3">3</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
         self.check_html(
             self.widget(choices=choices),
             "nums",
             ["2"],
-            html=(
-                """<select multiple name="nums">
+            html=("""<select multiple name="nums">
             <option value="1">1</option>
             <option value="2" selected>2</option>
             <option value="3">3</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
         self.check_html(
             self.widget(choices=choices),
             "nums",
             [2],
-            html=(
-                """<select multiple name="nums">
+            html=("""<select multiple name="nums">
             <option value="1">1</option>
             <option value="2" selected>2</option>
             <option value="3">3</option>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_optgroup_select_multiple(self):
@@ -173,15 +155,13 @@ class SelectMultipleTest(WidgetTest):
             widget,
             "nestchoice",
             ["outer1", "inner2"],
-            html=(
-                """<select multiple name="nestchoice">
+            html=("""<select multiple name="nestchoice">
             <option value="outer1" selected>Outer 1</option>
             <optgroup label="Group &quot;1&quot;">
             <option value="inner1">Inner 1</option>
             <option value="inner2" selected>Inner 2</option>
             </optgroup>
-            </select>"""
-            ),
+            </select>"""),
         )
 
     def test_value_omitted_from_data(self):
diff --git a/tests/forms_tests/widget_tests/test_splithiddendatetimewidget.py b/tests/forms_tests/widget_tests/test_splithiddendatetimewidget.py
index 93ded6ac6d..1083ccc4ec 100644
--- a/tests/forms_tests/widget_tests/test_splithiddendatetimewidget.py
+++ b/tests/forms_tests/widget_tests/test_splithiddendatetimewidget.py
@@ -56,12 +56,10 @@ class SplitHiddenDateTimeWidgetTest(WidgetTest):
             self.widget,
             "date",
             d,
-            html=(
-                """
+            html=("""
             <input type="hidden" name="date_0" value="17.09.2007">
             <input type="hidden" name="date_1" value="12:51:00">
-            """
-            ),
+            """),
         )
 
     def test_constructor_different_attrs(self):
diff --git a/tests/generic_relations/test_forms.py b/tests/generic_relations/test_forms.py
index 00df254745..48fe895210 100644
--- a/tests/generic_relations/test_forms.py
+++ b/tests/generic_relations/test_forms.py
@@ -117,8 +117,7 @@ class GenericInlineFormsetTests(TestCase):
             <input type="hidden"
                 name="generic_relations-taggeditem-content_type-object_id-1-id"
                 id="id_generic_relations-taggeditem-content_type-object_id-1-id"></p>
-            """
-            % tagged_item_id,
+            """ % tagged_item_id,
         )
         lion = Animal.objects.create(common_name="Lion", latin_name="Panthera leo")
         formset = GenericFormSet(instance=lion, prefix="x")
diff --git a/tests/i18n/patterns/tests.py b/tests/i18n/patterns/tests.py
index bd329e69f8..1eb6d3d60f 100644
--- a/tests/i18n/patterns/tests.py
+++ b/tests/i18n/patterns/tests.py
@@ -484,51 +484,43 @@ class URLTagTests(URLTestCaseBase):
     """
 
     def test_strings_only(self):
-        t = Template(
-            """{% load i18n %}
+        t = Template("""{% load i18n %}
             {% language 'nl' %}{% url 'no-prefix-translated' %}{% endlanguage %}
-            {% language 'pt-br' %}{% url 'no-prefix-translated' %}{% endlanguage %}"""
-        )
+            {% language 'pt-br' %}{% url 'no-prefix-translated' %}{% endlanguage %}""")
         self.assertEqual(
             t.render(Context({})).strip().split(), ["/vertaald/", "/traduzidos/"]
         )
 
     def test_context(self):
         ctx = Context({"lang1": "nl", "lang2": "pt-br"})
-        tpl = Template(
-            """{% load i18n %}
+        tpl = Template("""{% load i18n %}
             {% language lang1 %}{% url 'no-prefix-translated' %}{% endlanguage %}
-            {% language lang2 %}{% url 'no-prefix-translated' %}{% endlanguage %}"""
-        )
+            {% language lang2 %}{% url 'no-prefix-translated' %}{% endlanguage %}""")
         self.assertEqual(
             tpl.render(ctx).strip().split(), ["/vertaald/", "/traduzidos/"]
         )
 
     def test_args(self):
-        tpl = Template(
-            """
+        tpl = Template("""
             {% load i18n %}
             {% language 'nl' %}
             {% url 'no-prefix-translated-slug' 'apo' %}{% endlanguage %}
             {% language 'pt-br' %}
             {% url 'no-prefix-translated-slug' 'apo' %}{% endlanguage %}
-            """
-        )
+            """)
         self.assertEqual(
             tpl.render(Context({})).strip().split(),
             ["/vertaald/apo/", "/traduzidos/apo/"],
         )
 
     def test_kwargs(self):
-        tpl = Template(
-            """
+        tpl = Template("""
             {% load i18n %}
             {% language 'nl'  %}
             {% url 'no-prefix-translated-slug' slug='apo' %}{% endlanguage %}
             {% language 'pt-br' %}
             {% url 'no-prefix-translated-slug' slug='apo' %}{% endlanguage %}
-            """
-        )
+            """)
         self.assertEqual(
             tpl.render(Context({})).strip().split(),
             ["/vertaald/apo/", "/traduzidos/apo/"],
diff --git a/tests/m2m_through_regress/tests.py b/tests/m2m_through_regress/tests.py
index eae151546b..77a15a574b 100644
--- a/tests/m2m_through_regress/tests.py
+++ b/tests/m2m_through_regress/tests.py
@@ -113,8 +113,7 @@ class M2MThroughSerializationTestCase(TestCase):
     <field type="CharField" name="name">Roll</field>
   </object>
 </django-objects>
-        """.strip()
-            % pks,
+        """.strip() % pks,
         )
 
 
diff --git a/tests/mail/tests.py b/tests/mail/tests.py
index 1dba83eb8e..851d1c371c 100644
--- a/tests/mail/tests.py
+++ b/tests/mail/tests.py
@@ -1087,15 +1087,13 @@ class MailTests(MailTestsMixin, SimpleTestCase):
         Attaching a message that uses 8bit content transfer encoding for
         non-ASCII characters should not raise a UnicodeEncodeError (#36119).
         """
-        attachment = dedent(
-            """\
+        attachment = dedent("""\
             Subject: A message using 8bit CTE
             Content-Type: text/plain; charset=utf-8
             Content-Transfer-Encoding: 8bit
 
             ¡8-bit content!
-            """
-        ).encode()
+            """).encode()
         email = EmailMessage()
         email.attach("attachment.eml", attachment, "message/rfc822")
         attachments = self.get_raw_attachments(email)
diff --git a/tests/migrations/test_multidb.py b/tests/migrations/test_multidb.py
index 7bf5d51454..14667bbdc3 100644
--- a/tests/migrations/test_multidb.py
+++ b/tests/migrations/test_multidb.py
@@ -112,9 +112,7 @@ class MultiDBOperationTests(OperationTestBase):
         sql = """
         INSERT INTO {0}_pony (pink, weight) VALUES (1, 3.55);
         INSERT INTO {0}_pony (pink, weight) VALUES (3, 5.0);
-        """.format(
-            app_label
-        )
+        """.format(app_label)
 
         operation = migrations.RunSQL(sql, hints=hints or {})
         # Test the state alteration does nothing
diff --git a/tests/model_forms/test_modelchoicefield.py b/tests/model_forms/test_modelchoicefield.py
index 8765f1a6d0..7b086fb182 100644
--- a/tests/model_forms/test_modelchoicefield.py
+++ b/tests/model_forms/test_modelchoicefield.py
@@ -402,8 +402,7 @@ class ModelChoiceFieldTests(TestCase):
             <div><label>
             <input type="checkbox" name="name" value="%d" data-slug="third-test">Third
             </label></div></div>
-            """
-            % (self.c1.pk, self.c2.pk, self.c3.pk),
+            """ % (self.c1.pk, self.c2.pk, self.c3.pk),
         )
 
     def test_choice_value_hash(self):
diff --git a/tests/model_forms/tests.py b/tests/model_forms/tests.py
index 129ce56c7a..7fb91be2f9 100644
--- a/tests/model_forms/tests.py
+++ b/tests/model_forms/tests.py
@@ -1653,8 +1653,7 @@ class ModelFormBasicTests(TestCase):
 <option value="%d" selected>Entertainment</option>
 <option value="%d" selected>It&#x27;s a test</option>
 <option value="%d">Third test</option>
-</select></li>"""
-            % (self.c1.pk, self.c2.pk, self.c3.pk),
+</select></li>""" % (self.c1.pk, self.c2.pk, self.c3.pk),
         )
 
     def test_basic_creation(self):
@@ -3119,8 +3118,7 @@ class OtherModelFormTests(TestCase):
             <select multiple name="colors" id="id_colors" required>
             <option value="%(blue_pk)s">Blue</option>
             </select></p>
-            """
-            % {"blue_pk": color.pk},
+            """ % {"blue_pk": color.pk},
         )
 
     def test_callable_field_default(self):
@@ -3157,9 +3155,7 @@ class OtherModelFormTests(TestCase):
             <option value="3" selected>Novel</option></select>
             <input id="initial-id_category" name="initial-category" type="hidden"
                 value="3">
-            """.format(
-                today_str
-            ),
+            """.format(today_str),
         )
         empty_data = {
             "title": "",
diff --git a/tests/postgres_tests/test_array.py b/tests/postgres_tests/test_array.py
index 392b8f946c..41fda970ae 100644
--- a/tests/postgres_tests/test_array.py
+++ b/tests/postgres_tests/test_array.py
@@ -1518,12 +1518,10 @@ class TestSplitFormWidget(PostgreSQLWidgetTestCase):
             "array",
             ["val1", "val2"],
             attrs={"id": "foo"},
-            html=(
-                """
+            html=("""
                 <input id="foo_0" name="array_0" type="text" value="val1">
                 <input id="foo_1" name="array_1" type="text" value="val2">
-                """
-            ),
+                """),
         )
 
     def test_value_omitted_from_data(self):
diff --git a/tests/requirements/py3.txt b/tests/requirements/py3.txt
index 28a8ae772e..cc73e0cd85 100644
--- a/tests/requirements/py3.txt
+++ b/tests/requirements/py3.txt
@@ -2,7 +2,7 @@ aiosmtpd >= 1.4.5
 asgiref >= 3.9.1
 argon2-cffi >= 23.1.0
 bcrypt >= 4.1.1
-black >= 25.1.0
+black >= 26.1.0
 docutils >= 0.22
 geoip2 >= 4.8.0
 jinja2 >= 2.11.0
diff --git a/tests/sitemaps_tests/test_http.py b/tests/sitemaps_tests/test_http.py
index b62060c0c6..be96ff6ba3 100644
--- a/tests/sitemaps_tests/test_http.py
+++ b/tests/sitemaps_tests/test_http.py
@@ -51,9 +51,7 @@ class HTTPSitemapTests(SitemapTestsBase):
 <sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
 <sitemap><loc>{0}/simple/sitemap-simple.xml</loc><lastmod>{1}</lastmod></sitemap><sitemap><loc>{0}/simple/sitemap-simple.xml?p=2</loc><lastmod>{1}</lastmod></sitemap>
 </sitemapindex>
-""".format(
-            self.base_url, date.today()
-        )
+""".format(self.base_url, date.today())
         self.assertXMLEqual(response.text, expected_content)
 
     @override_settings(
@@ -364,9 +362,7 @@ class HTTPSitemapTests(SitemapTestsBase):
 <xhtml:link rel="alternate" hreflang="en" href="{url}/en/i18n/testmodel/{pk}/"/>
 <xhtml:link rel="alternate" hreflang="pt" href="{url}/pt/i18n/testmodel/{pk}/"/>
 </url>
-""".replace(
-            "\n", ""
-        )
+""".replace("\n", "")
         expected_content = (
             f'<?xml version="1.0" encoding="UTF-8"?>\n'
             f'<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" '
@@ -394,9 +390,7 @@ class HTTPSitemapTests(SitemapTestsBase):
 <xhtml:link rel="alternate" hreflang="en" href="{url}/en/i18n/testmodel/{pk}/"/>
 <xhtml:link rel="alternate" hreflang="es" href="{url}/es/i18n/testmodel/{pk}/"/>
 </url>
-""".replace(
-            "\n", ""
-        )
+""".replace("\n", "")
         expected_content = (
             f'<?xml version="1.0" encoding="UTF-8"?>\n'
             f'<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" '
@@ -424,9 +418,7 @@ class HTTPSitemapTests(SitemapTestsBase):
 <xhtml:link rel="alternate" hreflang="pt" href="{url}/pt/i18n/testmodel/{pk}/"/>
 <xhtml:link rel="alternate" hreflang="x-default" href="{url}/i18n/testmodel/{pk}/"/>
 </url>
-""".replace(
-            "\n", ""
-        )
+""".replace("\n", "")
         expected_content = (
             f'<?xml version="1.0" encoding="UTF-8"?>\n'
             f'<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" '
diff --git a/tests/sphinx/test_github_links.py b/tests/sphinx/test_github_links.py
index c0ca43b092..db0447b628 100644
--- a/tests/sphinx/test_github_links.py
+++ b/tests/sphinx/test_github_links.py
@@ -31,8 +31,7 @@ class GitHubLinkTests(SimpleTestCase):
         github_links = _github_links
 
     def test_code_locator(self):
-        locator = github_links.CodeLocator.from_code(
-            """
+        locator = github_links.CodeLocator.from_code("""
 from a import b, c
 from .d import e, f as g
 
@@ -41,8 +40,7 @@ def h():
 
 class I:
     def j(self):
-        pass"""
-        )
+        pass""")
 
         self.assertEqual(locator.node_line_numbers, {"h": 5, "I": 8, "I.j": 9})
         self.assertEqual(locator.import_locations, {"b": "a", "c": "a", "e": ".d"})
diff --git a/tests/test_runner/test_parallel.py b/tests/test_runner/test_parallel.py
index 32cc971d30..2ded499642 100644
--- a/tests/test_runner/test_parallel.py
+++ b/tests/test_runner/test_parallel.py
@@ -160,7 +160,7 @@ class RemoteTestResultTest(SimpleTestCase):
         self.assertEqual(event[0], "addError")
         self.assertEqual(event[1], -1)
         self.assertEqual(event[2], test_id)
-        (error_type, _, _) = event[3]
+        error_type, _, _ = event[3]
         self.assertEqual(error_type, ValueError)
         self.assertIs(result.wasSuccessful(), False)
 
diff --git a/tests/test_utils/tests.py b/tests/test_utils/tests.py
index 70cca3d441..bf332e064a 100644
--- a/tests/test_utils/tests.py
+++ b/tests/test_utils/tests.py
@@ -709,20 +709,16 @@ class HTMLEqualTests(SimpleTestCase):
 
     def test_parse_html_in_script(self):
         parse_html('<script>var a = "<p" + ">";</script>')
-        parse_html(
-            """
+        parse_html("""
             <script>
             var js_sha_link='<p>***</p>';
             </script>
-        """
-        )
+        """)
 
         # script content will be parsed to text
-        dom = parse_html(
-            """
+        dom = parse_html("""
             <script><p>foo</p> '</scr'+'ipt>' <span>bar</span></script>
-        """
-        )
+        """)
         self.assertEqual(len(dom.children), 1)
         self.assertEqual(dom.children[0], "<p>foo</p> '</scr'+'ipt>' <span>bar</span>")
 
@@ -1021,12 +1017,10 @@ class HTMLEqualTests(SimpleTestCase):
             self.assertHTMLEqual("<p><foo></p>", "<p>&#60;foo&#62;</p>")
 
     def test_contains_html(self):
-        response = HttpResponse(
-            """<body>
+        response = HttpResponse("""<body>
         This is a form: <form method="get">
             <input type="text" name="Hello" />
-        </form></body>"""
-        )
+        </form></body>""")
 
         self.assertNotContains(response, "<input name='Hello' type='text'>")
         self.assertContains(response, '<form method="get">')
@@ -1223,9 +1217,7 @@ class XMLEqualTests(SimpleTestCase):
 - <elem attr1='a' />
 + <elem attr2='b' attr1='a' />
 ?      ++++++++++
-""".format(
-            xml1=repr(xml1), xml2=repr(xml2)
-        )
+""".format(xml1=repr(xml1), xml2=repr(xml2))
 
         with self.assertRaisesMessage(AssertionError, msg):
             self.assertXMLEqual(xml1, xml2)