Move internal _is_unittest_unexpected_success_a_failure to "compat" module

Fix #1815

_pytest/compat.py

@@ -173,6 +173,7 @@ def get_real_func(obj):
         obj = obj.func
     return obj
 
+
 def getfslineno(obj):
     # xxx let decorators etc specify a sane ordering
     obj = get_real_func(obj)
@@ -182,6 +183,7 @@ def getfslineno(obj):
     assert isinstance(fslineno[1], int), obj
     return fslineno
 
+
 def getimfunc(func):
     try:
         return func.__func__
@@ -191,6 +193,7 @@ def getimfunc(func):
         except AttributeError:
             return func
 
+
 def safe_getattr(object, name, default):
     """ Like getattr but return default upon any Exception.
 
@@ -201,3 +204,15 @@ def safe_getattr(object, name, default):
         return getattr(object, name, default)
     except Exception:
         return default
+
+
+def _is_unittest_unexpected_success_a_failure():
+    """Return if the test suite should fail if a @expectedFailure unittest test PASSES.
+
+    From https://docs.python.org/3/library/unittest.html?highlight=unittest#unittest.TestResult.wasSuccessful:
+        Changed in version 3.4: Returns False if there were any
+        unexpectedSuccesses from tests marked with the expectedFailure() decorator.
+
+    TODO: this should be moved to the "compat" module.
+    """
+    return sys.version_info >= (3, 4)

_pytest/skipping.py

@@ -216,18 +216,6 @@ def check_strict_xfail(pyfuncitem):
             pytest.fail('[XPASS(strict)] ' + explanation, pytrace=False)
 
 
-def _is_unittest_unexpected_success_a_failure():
-    """Return if the test suite should fail if a @expectedFailure unittest test PASSES.
-
-    From https://docs.python.org/3/library/unittest.html?highlight=unittest#unittest.TestResult.wasSuccessful:
-        Changed in version 3.4: Returns False if there were any
-        unexpectedSuccesses from tests marked with the expectedFailure() decorator.
-
-    TODO: this should be moved to the "compat" module.
-    """
-    return sys.version_info >= (3, 4)
-
-
 @pytest.hookimpl(hookwrapper=True)
 def pytest_runtest_makereport(item, call):
     outcome = yield
@@ -236,6 +224,7 @@ def pytest_runtest_makereport(item, call):
     evalskip = getattr(item, '_evalskip', None)
     # unitttest special case, see setting of _unexpectedsuccess
     if hasattr(item, '_unexpectedsuccess') and rep.when == "call":
+        from _pytest.compat import _is_unittest_unexpected_success_a_failure
         if item._unexpectedsuccess:
             rep.longrepr = "Unexpected success: {0}".format(item._unexpectedsuccess)
         else:

testing/test_unittest.py

@@ -419,7 +419,7 @@ class TestTrialUnittest:
                 def test_method(self):
                     pass
         """)
-        from _pytest.skipping import _is_unittest_unexpected_success_a_failure
+        from _pytest.compat import _is_unittest_unexpected_success_a_failure
         should_fail = _is_unittest_unexpected_success_a_failure()
         result = testdir.runpytest("-rxs")
         result.stdout.fnmatch_lines_random([
@@ -629,7 +629,7 @@ def test_unittest_expected_failure_for_passing_test_is_fail(testdir, runner):
         if __name__ == '__main__':
             unittest.main()
     """)
-    from _pytest.skipping import _is_unittest_unexpected_success_a_failure
+    from _pytest.compat import _is_unittest_unexpected_success_a_failure
     should_fail = _is_unittest_unexpected_success_a_failure()
     if runner == 'pytest':
         result = testdir.runpytest("-rxX")