bpo-34279: regrtest consider that skipped tests are ran (GH-11132)


bpo-34279, bpo-35412: support.run_unittest() no longer raises
TestDidNotRun if a test result contains skipped tests. The
exception is now only raised if no test have been run and no test
have been skipped.
(cherry picked from commit 3a8f4fef4a4dd0e4a800545468eef9542e126181)

Co-authored-by: Victor Stinner <vstinner@redhat.com>
diff --git a/Lib/test/test_regrtest.py b/Lib/test/test_regrtest.py
index db9bd6d..a674583 100644
--- a/Lib/test/test_regrtest.py
+++ b/Lib/test/test_regrtest.py
@@ -1004,6 +1004,7 @@
         output = self.run_tests("-w", testname, exitcode=2)
         self.check_executed_tests(output, [testname],
                                   failed=testname, rerun=testname)
+
     def test_no_tests_ran(self):
         code = textwrap.dedent("""
             import unittest
@@ -1017,6 +1018,19 @@
         output = self.run_tests(testname, "-m", "nosuchtest", exitcode=0)
         self.check_executed_tests(output, [testname], no_test_ran=testname)
 
+    def test_no_tests_ran_skip(self):
+        code = textwrap.dedent("""
+            import unittest
+
+            class Tests(unittest.TestCase):
+                def test_skipped(self):
+                    self.skipTest("because")
+        """)
+        testname = self.create_test(code=code)
+
+        output = self.run_tests(testname, exitcode=0)
+        self.check_executed_tests(output, [testname])
+
     def test_no_tests_ran_multiple_tests_nonexistent(self):
         code = textwrap.dedent("""
             import unittest