Issue #24134: assertRaises(), assertRaisesRegex(), assertWarns() and

assertWarnsRegex() checks are not longer successful if the callable is None.

Added tests for assertRaises().

Lib/unittest/test/test_case.py

@@ -1134,6 +1134,50 @@ test case
         self.assertRaises(self.failureException, self.assertRegex,
                           'saaas', r'aaaa')
 
+    def testAssertRaisesCallable(self):
+        class ExceptionMock(Exception):
+            pass
+        def Stub():
+            raise ExceptionMock('We expect')
+        self.assertRaises(ExceptionMock, Stub)
+        # A tuple of exception classes is accepted
+        self.assertRaises((ValueError, ExceptionMock), Stub)
+        # *args and **kwargs also work
+        self.assertRaises(ValueError, int, '19', base=8)
+        # Failure when no exception is raised
+        with self.assertRaises(self.failureException):
+            self.assertRaises(ExceptionMock, lambda: 0)
+        # Failure when the function is None
+        with self.assertRaises(TypeError):
+            self.assertRaises(ExceptionMock, None)
+        # Failure when another exception is raised
+        with self.assertRaises(ExceptionMock):
+            self.assertRaises(ValueError, Stub)
+
+    def testAssertRaisesContext(self):
+        class ExceptionMock(Exception):
+            pass
+        def Stub():
+            raise ExceptionMock('We expect')
+        with self.assertRaises(ExceptionMock):
+            Stub()
+        # A tuple of exception classes is accepted
+        with self.assertRaises((ValueError, ExceptionMock)) as cm:
+            Stub()
+        # The context manager exposes caught exception
+        self.assertIsInstance(cm.exception, ExceptionMock)
+        self.assertEqual(cm.exception.args[0], 'We expect')
+        # *args and **kwargs also work
+        with self.assertRaises(ValueError):
+            int('19', base=8)
+        # Failure when no exception is raised
+        with self.assertRaises(self.failureException):
+            with self.assertRaises(ExceptionMock):
+                pass
+        # Failure when another exception is raised
+        with self.assertRaises(ExceptionMock):
+            self.assertRaises(ValueError, Stub)
+
     def testAssertRaisesRegex(self):
         class ExceptionMock(Exception):
             pass
@@ -1143,6 +1187,8 @@ test case
 
         self.assertRaisesRegex(ExceptionMock, re.compile('expect$'), Stub)
         self.assertRaisesRegex(ExceptionMock, 'expect$', Stub)
+        with self.assertRaises(TypeError):
+            self.assertRaisesRegex(ExceptionMock, 'expect$', None)
 
     def testAssertNotRaisesRegex(self):
         self.assertRaisesRegex(
@@ -1210,6 +1256,9 @@ test case
         # Failure when no warning is triggered
         with self.assertRaises(self.failureException):
             self.assertWarns(RuntimeWarning, lambda: 0)
+        # Failure when the function is None
+        with self.assertRaises(TypeError):
+            self.assertWarns(RuntimeWarning, None)
         # Failure when another warning is triggered
         with warnings.catch_warnings():
             # Force default filter (in case tests are run with -We)
@@ -1271,6 +1320,9 @@ test case
         with self.assertRaises(self.failureException):
             self.assertWarnsRegex(RuntimeWarning, "o+",
                                   lambda: 0)
+        # Failure when the function is None
+        with self.assertRaises(TypeError):
+            self.assertWarnsRegex(RuntimeWarning, "o+", None)
         # Failure when another warning is triggered
         with warnings.catch_warnings():
             # Force default filter (in case tests are run with -We)