Fixes #23643 -- Added chained exception details to debug view.

2 files changed, 45 insertions, 0 deletions

diff --git a/tests/view_tests/tests/py3_test_debug.py b/tests/view_tests/tests/py3_test_debug.py
new file mode 100644
index 0000000000..38d840f07a
--- /dev/null
+++ b/tests/view_tests/tests/py3_test_debug.py
@@ -0,0 +1,42 @@
+"""
+Since this file contains Python 3 specific syntax, it's named without a test_
+prefix so the test runner won't try to import it. Instead, the test class is
+imported in test_debug.py, but only on Python 3.
+
+This filename is also in setup.cfg flake8 exclude since the Python 2 syntax
+error (raise ... from ...) can't be silenced using NOQA.
+"""
+import sys
+
+from django.test import RequestFactory, TestCase
+from django.views.debug import ExceptionReporter
+
+
+class Py3ExceptionReporterTests(TestCase):
+
+    rf = RequestFactory()
+
+    def test_reporting_of_nested_exceptions(self):
+        request = self.rf.get('/test_view/')
+        try:
+            try:
+                raise AttributeError('Top level')
+            except AttributeError as explicit:
+                try:
+                    raise ValueError('Second exception') from explicit
+                except ValueError:
+                    raise IndexError('Final exception')
+        except Exception:
+            # Custom exception handler, just pass it into ExceptionReporter
+            exc_type, exc_value, tb = sys.exc_info()
+
+        explicit_exc = 'The above exception ({0}) was the direct cause of the following exception:'
+        implicit_exc = 'During handling of the above exception ({0}), another exception occurred:'
+        reporter = ExceptionReporter(request, exc_type, exc_value, tb)
+        html = reporter.get_traceback_html()
+        self.assertIn(explicit_exc.format("Top level"), html)
+        self.assertIn(implicit_exc.format("Second exception"), html)
+
+        text = reporter.get_traceback_text()
+        self.assertIn(explicit_exc.format("Top level"), text)
+        self.assertIn(implicit_exc.format("Second exception"), text)
diff --git a/tests/view_tests/tests/test_debug.py b/tests/view_tests/tests/test_debug.py
index 51f86f225f..95dfb8f875 100644
--- a/tests/view_tests/tests/test_debug.py
+++ b/tests/view_tests/tests/test_debug.py
@@ -28,6 +28,9 @@ from ..views import (
     sensitive_kwargs_function_caller, sensitive_method_view, sensitive_view,
 )
 
+if six.PY3:
+    from .py3_test_debug import Py3ExceptionReporterTests  # NOQA
+
 
 class CallableSettingWrapperTests(TestCase):
     """ Unittests for CallableSettingWrapper