config: Switch code paths to use 'ConfigFileFinder.config_file'

Now that the `ConfigFileFinder` has the `.config_file` attribute, switch
the relevant code paths to utilize this public attribute.

Tests have been updated to either construct `ConfigFileFinder` or mock
the object appropriately.

3 files changed, 12 insertions, 5 deletions

diff --git a/tests/integration/test_aggregator.py b/tests/integration/test_aggregator.py
index 672c865..e365dfc 100644
--- a/tests/integration/test_aggregator.py
+++ b/tests/integration/test_aggregator.py
@@ -30,7 +30,10 @@ def test_aggregate_options_with_config(optmanager):
     """Verify we aggregate options and config values appropriately."""
     arguments = ['flake8', '--select',
                  'E11,E34,E402,W,F', '--exclude', 'tests/*']
-    config_finder = config.ConfigFileFinder('flake8', [])
+    config_finder = config.ConfigFileFinder(
+        'flake8',
+        [],
+        config_file=CLI_SPECIFIED_CONFIG)
     options, args = aggregator.aggregate_options(
         optmanager, config_finder, CLI_SPECIFIED_CONFIG, arguments)
 
diff --git a/tests/unit/test_get_local_plugins.py b/tests/unit/test_get_local_plugins.py
index 6311677..2a23d7a 100644
--- a/tests/unit/test_get_local_plugins.py
+++ b/tests/unit/test_get_local_plugins.py
@@ -24,10 +24,12 @@ def test_get_local_plugins_uses_cli_config():
     config_finder.cli_config.return_value = config_obj
     config_finder.ignore_config_files = False
     config_obj.get.return_value = ''
+    config_file_value = 'foo.ini'
+    config_finder.config_file = config_file_value
 
-    config.get_local_plugins(config_finder, cli_config='foo.ini')
+    config.get_local_plugins(config_finder, cli_config=config_file_value)
 
-    config_finder.cli_config.assert_called_once_with('foo.ini')
+    config_finder.cli_config.assert_called_once_with(config_file_value)
 
 
 def test_get_local_plugins():
diff --git a/tests/unit/test_merged_config_parser.py b/tests/unit/test_merged_config_parser.py
index f2d70d9..3881699 100644
--- a/tests/unit/test_merged_config_parser.py
+++ b/tests/unit/test_merged_config_parser.py
@@ -155,12 +155,14 @@ def test_parse_isolates_config(optmanager):
 
 def test_parse_uses_cli_config(optmanager):
     """Verify behaviour of the parse method with a specified config."""
+    config_file_value = 'foo.ini'
     config_finder = mock.MagicMock()
+    config_finder.config_file = config_file_value
     config_finder.ignore_config_files = False
     parser = config.MergedConfigParser(optmanager, config_finder)
 
-    parser.parse(cli_config='foo.ini')
-    config_finder.cli_config.assert_called_once_with('foo.ini')
+    parser.parse(cli_config=config_file_value)
+    config_finder.cli_config.assert_called_once_with(config_file_value)
 
 
 @pytest.mark.parametrize('config_fixture_path', [