Remove hacking check N327

With mock 1.1.0+, mock will fail when nonexistent
methods are called, so this check is no longer
necessary.

Related-Bug: #1473454

Change-Id: I9cb8b4a5eab78e51728aa8f83668f5979c0b9be1

HACKING.rst

@@ -12,7 +12,6 @@ Cinder Specific Commandments
 - [N322] Ensure default arguments are not mutable.
 - [N323] Add check for explicit import of _() to ensure proper translation.
 - [N325] str() and unicode() cannot be used on an exception.  Remove or use six.text_type().
-- [N327] assert_called_once is not a valid Mock method.
 - [N328] LOG.info messages require translations `_LI()`.
 - [N329] LOG.exception and LOG.error messages require translations `_LE()`.
 - [N330] LOG.warning messages require translations `_LW()`.

cinder/hacking/checks.py

@@ -200,17 +200,6 @@ class CheckForStrUnicodeExc(BaseASTChecker):
         super(CheckForStrUnicodeExc, self).generic_visit(node)
 
 
-def check_assert_called_once(logical_line, filename):
-    msg = ("N327: assert_called_once is a no-op. please use assert_called_"
-           "once_with to test with explicit parameters or an assertEqual with"
-           " call_count.")
-
-    if 'cinder/tests/functional' or 'cinder/tests/unit' in filename:
-        pos = logical_line.find('.assert_called_once(')
-        if pos != -1:
-            yield (pos, msg)
-
-
 def validate_log_translations(logical_line, filename):
     # Translations are not required in the test directory.
     # This will not catch all instances of violations, just direct
@@ -324,7 +313,6 @@ def factory(register):
     register(no_mutable_default_args)
     register(check_explicit_underscore_import)
     register(CheckForStrUnicodeExc)
-    register(check_assert_called_once)
     register(check_oslo_namespace_imports)
     register(check_datetime_now)
     register(check_timeutils_strtime)

cinder/tests/unit/test_hacking.py

@@ -221,16 +221,6 @@ class HackingTestCase(test.TestCase):
         self.assertEqual(1, len(list(checks.no_mutable_default_args(
             "def foo (bar={}):"))))
 
-    def test_check_assert_called_once(self):
-        self.assertEqual(0, len(list(checks.check_assert_called_once(
-            ".assert_called_with(", "cinder/tests/unit/test1.py"))))
-        self.assertEqual(0, len(list(checks.check_assert_called_once(
-            ".assert_called_with(", "cinder/blah.py"))))
-        self.assertEqual(1, len(list(checks.check_assert_called_once(
-            ".assert_called_once(", "cinder/tests/unit/test1.py"))))
-        self.assertEqual(0, len(list(checks.check_assert_called_once(
-            ".assertEqual(", "cinder/tests/unit/test1.py"))))
-
     def test_oslo_namespace_imports_check(self):
         self.assertEqual(1, len(list(checks.check_oslo_namespace_imports(
             "from oslo.concurrency import foo"))))