Remove local Hacking for M318

Since we have added H203 in tox.ini [1], the local Hacking for M318
can be removed.
[1] https://review.openstack.org/#/c/484089/

Change-Id: Ieb652a41b77effdd8a67ea619ab592b1b065aec5

HACKING.rst

@@ -7,8 +7,6 @@ Mistral Specific Commandments
 -----------------------------
 
 - [M001] Use LOG.warning(). LOG.warn() is deprecated.
-- [M318] Change assertEqual(A, None) or assertEqual(None, A) by optimal assert
-  like assertIsNone(A)
 - [M319] Enforce use of assertTrue/assertFalse
 - [M320] Enforce use of assertIs/assertIsNot
 - [M327] Do not use xrange(). xrange() is not compatible with Python 3. Use

mistral/hacking/checks.py

@@ -30,28 +30,11 @@ import six
 oslo_namespace_imports_dot = re.compile(r"import[\s]+oslo[.][^\s]+")
 oslo_namespace_imports_from_dot = re.compile(r"from[\s]+oslo[.]")
 oslo_namespace_imports_from_root = re.compile(r"from[\s]+oslo[\s]+import[\s]+")
-assert_equal_end_with_none_re = re.compile(
-    r"(.)*assertEqual\((\w|\.|\'|\"|\[|\])+, None\)")
-assert_equal_start_with_none_re = re.compile(
-    r"(.)*assertEqual\(None, (\w|\.|\'|\"|\[|\])+\)")
 log_string_interpolation = re.compile(r".*LOG\.(?:error|warn|warning|info"
                                       r"|critical|exception|debug)"
                                       r"\([^,]*%[^,]*[,)]")
 
 
-def assert_equal_none(logical_line):
-    """Check for assertEqual(A, None) or assertEqual(None, A) sentences
-
-    M318
-    """
-    msg = ("M318: assertEqual(A, None) or assertEqual(None, A) "
-           "sentences not allowed. Use assertIsNone instead.")
-    res = (assert_equal_start_with_none_re.match(logical_line) or
-           assert_equal_end_with_none_re.match(logical_line))
-    if res:
-        yield (0, msg)
-
-
 def no_assert_equal_true_false(logical_line):
     """Check for assertTrue/assertFalse sentences
 
@@ -306,7 +289,6 @@ class CheckForLoggingIssues(BaseASTChecker):
 
 
 def factory(register):
-    register(assert_equal_none)
     register(no_assert_equal_true_false)
     register(no_assert_true_false_is_not)
     register(check_oslo_namespace_imports)

mistral/tests/unit/hacking/test_checks.py

@@ -59,16 +59,6 @@ class BaseLoggingCheckTest(base.BaseTest):
     def _assert_has_no_errors(self, code, checker, filename=None):
         self._assert_has_errors(code, checker, filename=filename)
 
-    def test_assert_equal_none(self):
-        self.assertEqual(len(list(checks.assert_equal_none(
-            "self.assertEqual(A, None)"))), 1)
-
-        self.assertEqual(len(list(checks.assert_equal_none(
-            "self.assertEqual(None, A)"))), 1)
-
-        self.assertEqual(
-            len(list(checks.assert_equal_none("self.assertIsNone()"))), 0)
-
     def test_no_assert_equal_true_false(self):
         code = """
                   self.assertEqual(context_is_admin, True)