Cleanup some unit tests and whitespace.

Remove some unnecessary newlines.
Remove a unittest that was attempting to test behaviour that was removed a while ago, so isn't testing anything.
Updated some unit tests to use mocks instead of a custom fake.

Signed-off-by: Daniel Nephin <dnephin@docker.com>

compose/service.py

@@ -300,9 +300,7 @@ class Service(object):
         Create a container for this service. If the image doesn't exist, attempt to pull
         it.
         """
-        self.ensure_image_exists(
-            do_build=do_build,
-        )
+        self.ensure_image_exists(do_build=do_build)
 
         container_options = self._get_container_create_options(
             override_options,
@@ -316,9 +314,7 @@ class Service(object):
 
         return Container.create(self.client, **container_options)
 
-    def ensure_image_exists(self,
-                            do_build=True):
-
+    def ensure_image_exists(self, do_build=True):
         try:
             self.image()
             return
@@ -403,9 +399,7 @@ class Service(object):
         (action, containers) = plan
 
         if action == 'create':
-            container = self.create_container(
-                do_build=do_build,
-            )
+            container = self.create_container(do_build=do_build)
             self.start_container(container)
 
             return [container]

tests/unit/service_test.py

@@ -351,44 +351,37 @@ class ServiceTest(unittest.TestCase):
         self.assertEqual(parse_repository_tag("user/repo@sha256:digest"), ("user/repo", "sha256:digest", "@"))
         self.assertEqual(parse_repository_tag("url:5000/repo@sha256:digest"), ("url:5000/repo", "sha256:digest", "@"))
 
-    @mock.patch('compose.service.Container', autospec=True)
-    def test_create_container_latest_is_used_when_no_tag_specified(self, mock_container):
-        service = Service('foo', client=self.mock_client, image='someimage')
-        images = []
-
-        def pull(repo, tag=None, **kwargs):
-            self.assertEqual('someimage', repo)
-            self.assertEqual('latest', tag)
-            images.append({'Id': 'abc123'})
-            return []
-
-        service.image = lambda *args, **kwargs: mock_get_image(images)
-        self.mock_client.pull = pull
-
-        service.create_container()
-        self.assertEqual(1, len(images))
-
     def test_create_container_with_build(self):
         service = Service('foo', client=self.mock_client, build='.')
-
-        images = []
-        service.image = lambda *args, **kwargs: mock_get_image(images)
-        service.build = lambda: images.append({'Id': 'abc123'})
+        self.mock_client.inspect_image.side_effect = [
+            NoSuchImageError,
+            {'Id': 'abc123'},
+        ]
+        self.mock_client.build.return_value = [
+            '{"stream": "Successfully built abcd"}',
+        ]
 
         service.create_container(do_build=True)
-        self.assertEqual(1, len(images))
+        self.mock_client.build.assert_called_once_with(
+            tag='default_foo',
+            dockerfile=None,
+            stream=True,
+            path='.',
+            pull=False,
+            nocache=False,
+            rm=True,
+        )
 
     def test_create_container_no_build(self):
         service = Service('foo', client=self.mock_client, build='.')
-        service.image = lambda: {'Id': 'abc123'}
+        self.mock_client.inspect_image.return_value = {'Id': 'abc123'}
 
         service.create_container(do_build=False)
         self.assertFalse(self.mock_client.build.called)
 
     def test_create_container_no_build_but_needs_build(self):
         service = Service('foo', client=self.mock_client, build='.')
-        service.image = lambda *args, **kwargs: mock_get_image([])
-
+        self.mock_client.inspect_image.side_effect = NoSuchImageError
         with self.assertRaises(NeedsBuildError):
             service.create_container(do_build=False)
 
@@ -488,13 +481,6 @@ class NetTestCase(unittest.TestCase):
         self.assertEqual(net.service_name, service_name)
 
 
-def mock_get_image(images):
-    if images:
-        return images[0]
-    else:
-        raise NoSuchImageError()
-
-
 class ServiceVolumesTest(unittest.TestCase):
 
     def setUp(self):