Fix dhcp _test_sync_state_helper asserting calls wrong

It was using a non-existing method that did nothing and
that masked other problems with the tests that used it.
Changed to use assert_has_calls() and fixed the problems
that fell out.

Change-Id: I4a64c3365f9958b14c2384932a31da2ce191e2e2
Closes-Bug: 1426265

neutron/hacking/checks.py

@@ -107,14 +107,22 @@ def check_assert_called_once_with(logical_line, filename):
     # Try to detect unintended calls of nonexistent mock methods like:
     #    assert_called_once
     #    assertCalledOnceWith
+    #    assert_has_called
     if 'neutron/tests/' in filename:
         if '.assert_called_once_with(' in logical_line:
             return
-        if '.assertcalledonce' in logical_line.lower().replace('_', ''):
+        uncased_line = logical_line.lower().replace('_', '')
+
+        if '.assertcalledonce' in uncased_line:
             msg = ("N322: Possible use of no-op mock method. "
                    "please use assert_called_once_with.")
             yield (0, msg)
 
+        if '.asserthascalled' in uncased_line:
+            msg = ("N322: Possible use of no-op mock method. "
+                   "please use assert_has_calls.")
+            yield (0, msg)
+
 
 def check_oslo_namespace_imports(logical_line):
     if re.match(oslo_namespace_imports_from_dot, logical_line):

neutron/tests/unit/agent/dhcp/test_agent.py

@@ -330,7 +330,9 @@ class TestDhcpAgent(base.BaseTestCase):
             trace_level='warning',
             expected_sync=False)
 
-    def _test_sync_state_helper(self, known_networks, active_networks):
+    def _test_sync_state_helper(self, known_net_ids, active_net_ids):
+        active_networks = set(mock.Mock(id=netid) for netid in active_net_ids)
+
         with mock.patch(DHCP_PLUGIN) as plug:
             mock_plugin = mock.Mock()
             mock_plugin.get_active_networks_info.return_value = active_networks
@@ -338,23 +340,18 @@ class TestDhcpAgent(base.BaseTestCase):
 
             dhcp = dhcp_agent.DhcpAgent(HOSTNAME)
 
-            attrs_to_mock = dict(
-                [(a, mock.DEFAULT) for a in
-                 ['refresh_dhcp_helper', 'disable_dhcp_helper', 'cache']])
+            attrs_to_mock = dict([(a, mock.DEFAULT)
+                                 for a in ['disable_dhcp_helper', 'cache',
+                                           'safe_configure_dhcp_for_network']])
 
             with mock.patch.multiple(dhcp, **attrs_to_mock) as mocks:
-                mocks['cache'].get_network_ids.return_value = known_networks
+                mocks['cache'].get_network_ids.return_value = known_net_ids
                 dhcp.sync_state()
 
-                exp_refresh = [
-                    mock.call(net_id) for net_id in active_networks]
-
-                diff = set(known_networks) - set(active_networks)
+                diff = set(known_net_ids) - set(active_net_ids)
                 exp_disable = [mock.call(net_id) for net_id in diff]
-
                 mocks['cache'].assert_has_calls([mock.call.get_network_ids()])
-                mocks['refresh_dhcp_helper'].assert_has_called(exp_refresh)
-                mocks['disable_dhcp_helper'].assert_has_called(exp_disable)
+                mocks['disable_dhcp_helper'].assert_has_calls(exp_disable)
 
     def test_sync_state_initial(self):
         self._test_sync_state_helper([], ['a'])
@@ -366,19 +363,10 @@ class TestDhcpAgent(base.BaseTestCase):
         self._test_sync_state_helper(['b'], ['a'])
 
     def test_sync_state_waitall(self):
-        class mockNetwork(object):
-            id = '0'
-            admin_state_up = True
-            subnets = []
-
-            def __init__(self, id):
-                self.id = id
         with mock.patch.object(dhcp_agent.eventlet.GreenPool, 'waitall') as w:
-            active_networks = [mockNetwork('1'), mockNetwork('2'),
-                               mockNetwork('3'), mockNetwork('4'),
-                               mockNetwork('5')]
-            known_networks = ['1', '2', '3', '4', '5']
-            self._test_sync_state_helper(known_networks, active_networks)
+            active_net_ids = ['1', '2', '3', '4', '5']
+            known_net_ids = ['1', '2', '3', '4', '5']
+            self._test_sync_state_helper(known_net_ids, active_net_ids)
             w.assert_called_once_with()
 
     def test_sync_state_plugin_error(self):

neutron/tests/unit/hacking/test_checks.py

@@ -92,11 +92,21 @@ class HackingTestCase(base.BaseTestCase):
                mock.method(1, 2, 3, test='wow')
                mock.method.assertCalledOnceWith()
                """
+        fail_code3 = """
+               mock = Mock()
+               mock.method(1, 2, 3, test='wow')
+               mock.method.assert_has_called()
+               """
         pass_code = """
                mock = Mock()
                mock.method(1, 2, 3, test='wow')
                mock.method.assert_called_once_with()
                """
+        pass_code2 = """
+               mock = Mock()
+               mock.method(1, 2, 3, test='wow')
+               mock.method.assert_has_calls()
+               """
         self.assertEqual(
             1, len(list(checks.check_assert_called_once_with(fail_code1,
                                             "neutron/tests/test_assert.py"))))
@@ -106,6 +116,12 @@ class HackingTestCase(base.BaseTestCase):
         self.assertEqual(
             0, len(list(checks.check_assert_called_once_with(pass_code,
                                             "neutron/tests/test_assert.py"))))
+        self.assertEqual(
+            1, len(list(checks.check_assert_called_once_with(fail_code3,
+                                            "neutron/tests/test_assert.py"))))
+        self.assertEqual(
+            0, len(list(checks.check_assert_called_once_with(pass_code2,
+                                            "neutron/tests/test_assert.py"))))
 
     def test_check_oslo_namespace_imports(self):
         def check(s, fail=True):