Fixed #26942 -- Added support for subtests during parallel testing.

tests/test_runner/test_parallel.py

@@ -0,0 +1,67 @@
+import unittest
+
+from django.test import SimpleTestCase
+from django.test.runner import RemoteTestResult
+from django.utils import six
+
+try:
+    import tblib
+except ImportError:
+    tblib = None
+
+
+class ParallelTestRunnerTest(SimpleTestCase):
+    """
+    End-to-end tests of the parallel test runner.
+
+    These tests are only meaningful when running tests in parallel using
+    the --parallel option, though it doesn't hurt to run them not in
+    parallel.
+    """
+
+    @unittest.skipUnless(six.PY3, 'subtests were added in Python 3.4')
+    def test_subtest(self):
+        """
+        Check that passing subtests work.
+        """
+        for i in range(2):
+            with self.subTest(index=i):
+                self.assertEqual(i, i)
+
+
+class SampleFailingSubtest(SimpleTestCase):
+
+    # This method name doesn't begin with "test" to prevent test discovery
+    # from seeing it.
+    def dummy_test(self):
+        """
+        A dummy test for testing subTest failures.
+        """
+        for i in range(3):
+            with self.subTest(index=i):
+                self.assertEqual(i, 1)
+
+
+class RemoteTestResultTest(SimpleTestCase):
+
+    @unittest.skipUnless(six.PY3 and tblib is not None, 'requires tblib to be installed')
+    def test_add_failing_subtests(self):
+        """
+        Failing subtests are added correctly using addSubTest().
+        """
+        # Manually run a test with failing subtests to prevent the failures
+        # from affecting the actual test run.
+        result = RemoteTestResult()
+        subtest_test = SampleFailingSubtest(methodName='dummy_test')
+        subtest_test.run(result=result)
+
+        events = result.events
+        self.assertEqual(len(events), 4)
+
+        event = events[1]
+        self.assertEqual(event[0], 'addSubTest')
+        self.assertEqual(str(event[2]), 'dummy_test (test_runner.test_parallel.SampleFailingSubtest) (index=0)')
+        self.assertEqual(repr(event[3][1]), "AssertionError('0 != 1',)")
+
+        event = events[2]
+        self.assertEqual(repr(event[3][1]), "AssertionError('2 != 1',)")