Extract helper methods for building config objects from dicts

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>

.pre-commit-config.yaml

@@ -10,7 +10,7 @@
     - id: end-of-file-fixer
     - id: flake8
     - id: name-tests-test
-      exclude: 'tests/integration/testcases.py'
+      exclude: 'tests/(helpers\.py|integration/testcases\.py)'
     - id: requirements-txt-fixer
     - id: trailing-whitespace
 - repo: git://github.com/asottile/reorder_python_imports

tests/helpers.py

@@ -0,0 +1,16 @@
+from __future__ import absolute_import
+from __future__ import unicode_literals
+
+from compose.config.config import ConfigDetails
+from compose.config.config import ConfigFile
+from compose.config.config import load
+
+
+def build_config(contents, **kwargs):
+    return load(build_config_details(contents, **kwargs))
+
+
+def build_config_details(contents, working_dir='working_dir', filename='filename.yml'):
+    return ConfigDetails(
+        working_dir,
+        [ConfigFile(filename, contents)])

tests/integration/project_test.py

@@ -7,6 +7,7 @@ import py
 import pytest
 from docker.errors import NotFound
 
+from ..helpers import build_config
 from .testcases import DockerClientTestCase
 from compose.config import config
 from compose.config import ConfigurationError
@@ -20,13 +21,6 @@ from compose.service import ConvergenceStrategy
 from tests.integration.testcases import v2_only
 
 
-def build_service_dicts(service_config):
-    return config.load(
-        config.ConfigDetails(
-            'working_dir',
-            [config.ConfigFile(None, service_config)]))
-
-
 class ProjectTest(DockerClientTestCase):
 
     def test_containers(self):
@@ -67,19 +61,18 @@ class ProjectTest(DockerClientTestCase):
         )
 
     def test_volumes_from_service(self):
-        service_dicts = build_service_dicts({
-            'data': {
-                'image': 'busybox:latest',
-                'volumes': ['/var/data'],
-            },
-            'db': {
-                'image': 'busybox:latest',
-                'volumes_from': ['data'],
-            },
-        })
         project = Project.from_config(
             name='composetest',
-            config_data=service_dicts,
+            config_data=build_config({
+                'data': {
+                    'image': 'busybox:latest',
+                    'volumes': ['/var/data'],
+                },
+                'db': {
+                    'image': 'busybox:latest',
+                    'volumes_from': ['data'],
+                },
+            }),
             client=self.client,
         )
         db = project.get_service('db')
@@ -96,7 +89,7 @@ class ProjectTest(DockerClientTestCase):
         )
         project = Project.from_config(
             name='composetest',
-            config_data=build_service_dicts({
+            config_data=build_config({
                 'db': {
                     'image': 'busybox:latest',
                     'volumes_from': ['composetest_data_container'],
@@ -112,7 +105,7 @@ class ProjectTest(DockerClientTestCase):
         project = Project.from_config(
             name='composetest',
             client=self.client,
-            config_data=build_service_dicts({
+            config_data=build_config({
                 'version': V2_0,
                 'services': {
                     'net': {
@@ -139,7 +132,7 @@ class ProjectTest(DockerClientTestCase):
         def get_project():
             return Project.from_config(
                 name='composetest',
-                config_data=build_service_dicts({
+                config_data=build_config({
                     'version': V2_0,
                     'services': {
                         'web': {
@@ -174,7 +167,7 @@ class ProjectTest(DockerClientTestCase):
     def test_net_from_service_v1(self):
         project = Project.from_config(
             name='composetest',
-            config_data=build_service_dicts({
+            config_data=build_config({
                 'net': {
                     'image': 'busybox:latest',
                     'command': ["top"]
@@ -198,7 +191,7 @@ class ProjectTest(DockerClientTestCase):
         def get_project():
             return Project.from_config(
                 name='composetest',
-                config_data=build_service_dicts({
+                config_data=build_config({
                     'web': {
                         'image': 'busybox:latest',
                         'net': 'container:composetest_net_container'
@@ -469,7 +462,7 @@ class ProjectTest(DockerClientTestCase):
     def test_project_up_starts_depends(self):
         project = Project.from_config(
             name='composetest',
-            config_data=build_service_dicts({
+            config_data=build_config({
                 'console': {
                     'image': 'busybox:latest',
                     'command': ["top"],
@@ -504,7 +497,7 @@ class ProjectTest(DockerClientTestCase):
     def test_project_up_with_no_deps(self):
         project = Project.from_config(
             name='composetest',
-            config_data=build_service_dicts({
+            config_data=build_config({
                 'console': {
                     'image': 'busybox:latest',
                     'command': ["top"],

tests/unit/config/config_test.py

@@ -11,6 +11,7 @@ from operator import itemgetter
 import py
 import pytest
 
+from ...helpers import build_config_details
 from compose.config import config
 from compose.config.config import resolve_build_args
 from compose.config.config import resolve_environment
@@ -43,12 +44,6 @@ def service_sort(services):
     return sorted(services, key=itemgetter('name'))
 
 
-def build_config_details(contents, working_dir='working_dir', filename='filename.yml'):
-    return config.ConfigDetails(
-        working_dir,
-        [config.ConfigFile(filename, contents)])
-
-
 class ConfigTest(unittest.TestCase):
     def test_load(self):
         service_dicts = config.load(