Issue #20362: Honour TestCase.longMessage correctly in assertRegex.

Patch from Ilia Kurenkov.

Lib/unittest/case.py

@@ -1279,8 +1279,10 @@ class TestCase(object):
             assert expected_regex, "expected_regex must not be empty."
             expected_regex = re.compile(expected_regex)
         if not expected_regex.search(text):
-            msg = msg or "Regex didn't match"
-            msg = '%s: %r not found in %r' % (msg, expected_regex.pattern, text)
+            standardMsg = "Regex didn't match: %r not found in %r" % (
+                expected_regex.pattern, text)
+            # _formatMessage ensures the longMessage option is respected
+            msg = self._formatMessage(msg, standardMsg)
             raise self.failureException(msg)
 
     def assertNotRegex(self, text, unexpected_regex, msg=None):
@@ -1289,11 +1291,12 @@ class TestCase(object):
             unexpected_regex = re.compile(unexpected_regex)
         match = unexpected_regex.search(text)
         if match:
-            msg = msg or "Regex matched"
-            msg = '%s: %r matches %r in %r' % (msg,
-                                               text[match.start():match.end()],
+            standardMsg = 'Regex matched: %r matches %r in %r' % (
+                text[match.start() : match.end()],
                 unexpected_regex.pattern,
                 text)
+            # _formatMessage ensures the longMessage option is respected
+            msg = self._formatMessage(msg, standardMsg)
             raise self.failureException(msg)
 
 
@@ -1315,6 +1318,7 @@ class TestCase(object):
     failIf = _deprecate(assertFalse)
     assertRaisesRegexp = _deprecate(assertRaisesRegex)
     assertRegexpMatches = _deprecate(assertRegex)
+    assertNotRegexpMatches = _deprecate(assertNotRegex)
 
 
 

Lib/unittest/test/test_assertions.py

@@ -133,7 +133,6 @@ class Test_Assertions(unittest.TestCase):
         try:
             self.assertNotRegex('Ala ma kota', r'k.t', 'Message')
         except self.failureException as e:
-            self.assertIn("'kot'", e.args[0])
             self.assertIn('Message', e.args[0])
         else:
             self.fail('assertNotRegex should have failed.')
@@ -329,6 +328,20 @@ class TestLongMessage(unittest.TestCase):
                              "^unexpectedly identical: None$",
                              "^unexpectedly identical: None : oops$"])
 
+    def testAssertRegex(self):
+        self.assertMessages('assertRegex', ('foo', 'bar'),
+                            ["^Regex didn't match:",
+                             "^oops$",
+                             "^Regex didn't match:",
+                             "^Regex didn't match: (.*) : oops$"])
+
+    def testAssertNotRegex(self):
+        self.assertMessages('assertNotRegex', ('foo', 'foo'),
+                            ["^Regex matched:",
+                             "^oops$",
+                             "^Regex matched:",
+                             "^Regex matched: (.*) : oops$"])
+
 
     def assertMessagesCM(self, methodName, args, func, errors):
         """

Misc/ACKS

@@ -786,6 +786,7 @@ Andrew Kuchling
 Dave Kuhlman
 Jon Kuhn
 Toshio Kuratomi
+Ilia Kurenkov
 Vladimir Kushnir
 Erno Kuusela
 Ross Lagerwall

Misc/NEWS

@@ -17,6 +17,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #20362: Honour TestCase.longMessage correctly in assertRegex.
+  Patch from Ilia Kurenkov.
+
 - Issue #24847: Removes vcruntime140.dll dependency from Tcl/Tk.
 
 - Issue #23572: Fixed functools.singledispatch on classes with falsy