Pass on parameters in unittest.TextTestResult.__init__ super call

Lib/unittest/runner.py

@@ -34,7 +34,7 @@ class TextTestResult(result.TestResult):
     separator2 = '-' * 70
 
     def __init__(self, stream, descriptions, verbosity):
-        super(TextTestResult, self).__init__()
+        super(TextTestResult, self).__init__(stream, descriptions, verbosity)
         self.stream = stream
         self.showAll = verbosity > 1
         self.dots = verbosity == 1

Lib/unittest/test/test_runner.py

@@ -149,6 +149,19 @@ class Test_TextTestRunner(unittest.TestCase):
         self.assertEqual(runner.resultclass, unittest.TextTestResult)
 
 
+    def test_multiple_inheritance(self):
+        class AResult(unittest.TestResult):
+            def __init__(self, stream, descriptions, verbosity):
+                super(AResult, self).__init__(stream, descriptions, verbosity)
+
+        class ATextResult(unittest.TextTestResult, AResult):
+            pass
+
+        # This used to raise an exception due to TextTestResult not passing
+        # on arguments in its __init__ super call
+        ATextResult(None, None, None)
+
+
     def testBufferAndFailfast(self):
         class Test(unittest.TestCase):
             def testFoo(self):

Misc/NEWS

@@ -107,6 +107,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #12376: Pass on parameters in TextTestResult.__init__ super call
+
 - Issue #15222: Insert blank line after each message in mbox mailboxes
 
 - Issue #16013: Fix CSV Reader parsing issue with ending quote characters.