Merge branch 'config-finder-extra-files-optional' into 'master'

config: Make ConfigFileFinder 'extra_config_files' parameter optional

See merge request pycqa/flake8!402

src/flake8/options/config.py

@@ -19,11 +19,11 @@ class ConfigFileFinder(object):
     def __init__(
         self,
         program_name,
-        extra_config_files,
+        extra_config_files=None,
         config_file=None,
         ignore_config_files=False,
     ):
-        # type: (str, List[str], Optional[str], bool) -> None
+        # type: (str, Optional[List[str]], Optional[str], bool) -> None
         """Initialize object to find config files.
 
         :param str program_name:
@@ -36,7 +36,8 @@ class ConfigFileFinder(object):
             Determine whether to ignore configuration files or not.
         """
         # The values of --append-config from the CLI
-        extra_config_files = extra_config_files or []
+        if extra_config_files is None:
+            extra_config_files = []
         self.extra_config_files = utils.normalize_paths(extra_config_files)
 
         # The value of --config from the CLI.

tests/integration/test_aggregator.py

@@ -32,7 +32,6 @@ def test_aggregate_options_with_config(optmanager):
                  'E11,E34,E402,W,F', '--exclude', 'tests/*']
     config_finder = config.ConfigFileFinder(
         'flake8',
-        [],
         config_file=CLI_SPECIFIED_CONFIG)
     options, args = aggregator.aggregate_options(
         optmanager, config_finder, arguments)
@@ -47,7 +46,7 @@ def test_aggregate_options_when_isolated(optmanager):
     arguments = ['flake8', '--select', 'E11,E34,E402,W,F',
                  '--exclude', 'tests/*']
     config_finder = config.ConfigFileFinder(
-        'flake8', [], ignore_config_files=True)
+        'flake8', ignore_config_files=True)
     optmanager.extend_default_ignore(['E8'])
     options, args = aggregator.aggregate_options(
         optmanager, config_finder, arguments)

tests/unit/test_config_file_finder.py

@@ -21,14 +21,14 @@ BROKEN_CONFIG_PATH = 'tests/fixtures/config_files/broken.ini'
 def test_windows_detection(platform, is_windows):
     """Verify we detect Windows to the best of our knowledge."""
     with mock.patch.object(sys, 'platform', platform):
-        finder = config.ConfigFileFinder('flake8', [])
+        finder = config.ConfigFileFinder('flake8')
     assert finder.is_windows is is_windows
 
 
 def test_cli_config():
     """Verify opening and reading the file specified via the cli."""
     cli_filepath = CLI_SPECIFIED_FILEPATH
-    finder = config.ConfigFileFinder('flake8', [])
+    finder = config.ConfigFileFinder('flake8')
 
     parsed_config = finder.cli_config(cli_filepath)
     assert parsed_config.has_section('flake8')
@@ -36,7 +36,7 @@ def test_cli_config():
 
 def test_cli_config_double_read():
     """Second request for CLI config is cached."""
-    finder = config.ConfigFileFinder('flake8', [])
+    finder = config.ConfigFileFinder('flake8')
 
     parsed_config = finder.cli_config(CLI_SPECIFIED_FILEPATH)
     boom = Exception("second request for CLI config not cached")
@@ -61,7 +61,7 @@ def test_cli_config_double_read():
 ])
 def test_generate_possible_local_files(cwd, expected):
     """Verify generation of all possible config paths."""
-    finder = config.ConfigFileFinder('flake8', [])
+    finder = config.ConfigFileFinder('flake8')
 
     with mock.patch.object(os, 'getcwd', return_value=cwd):
         config_files = list(finder.generate_possible_local_files())
@@ -91,14 +91,14 @@ def test_local_config_files(extra_config_files, expected):
 
 def test_local_configs():
     """Verify we return a ConfigParser."""
-    finder = config.ConfigFileFinder('flake8', [])
+    finder = config.ConfigFileFinder('flake8')
 
     assert isinstance(finder.local_configs(), configparser.RawConfigParser)
 
 
 def test_local_configs_double_read():
     """Second request for local configs is cached."""
-    finder = config.ConfigFileFinder('flake8', [])
+    finder = config.ConfigFileFinder('flake8')
 
     first_read = finder.local_configs()
     boom = Exception("second request for local configs not cached")
@@ -129,24 +129,20 @@ def test_read_config_catches_decoding_errors(tmpdir):
 
 def test_config_file_default_value():
     """Verify the default 'config_file' attribute value."""
-    finder = config.ConfigFileFinder('flake8', [])
+    finder = config.ConfigFileFinder('flake8')
     assert finder.config_file is None
 
 
 def test_setting_config_file_value():
     """Verify the 'config_file' attribute matches constructed value."""
     config_file_value = 'flake8.ini'
-    finder = config.ConfigFileFinder(
-        'flake8',
-        [],
-        config_file=config_file_value,
-    )
+    finder = config.ConfigFileFinder('flake8', config_file=config_file_value)
     assert finder.config_file == config_file_value
 
 
 def test_ignore_config_files_default_value():
     """Verify the default 'ignore_config_files' attribute value."""
-    finder = config.ConfigFileFinder('flake8', [])
+    finder = config.ConfigFileFinder('flake8')
     assert finder.ignore_config_files is False
 
 
@@ -158,7 +154,6 @@ def test_setting_ignore_config_files_value(ignore_config_files_arg):
     """Verify the 'ignore_config_files' attribute matches constructed value."""
     finder = config.ConfigFileFinder(
         'flake8',
-        [],
         ignore_config_files=ignore_config_files_arg
     )
     assert finder.ignore_config_files is ignore_config_files_arg

tests/unit/test_get_local_plugins.py

@@ -35,7 +35,7 @@ def test_get_local_plugins_uses_cli_config():
 def test_get_local_plugins():
     """Verify get_local_plugins returns expected plugins."""
     config_fixture_path = 'tests/fixtures/config_files/local-plugin.ini'
-    config_finder = config.ConfigFileFinder('flake8', [])
+    config_finder = config.ConfigFileFinder('flake8')
 
     with mock.patch.object(config_finder, 'local_config_files') as localcfs:
         localcfs.return_value = [config_fixture_path]

tests/unit/test_legacy_api.py

@@ -22,7 +22,7 @@ def test_get_style_guide():
     mockedapp.parse_preliminary_options.return_value = (prelim_opts, [])
     mockedapp.program = 'flake8'
     with mock.patch('flake8.api.legacy.config.ConfigFileFinder') as mock_config_finder:  # noqa: E501
-        config_finder = ConfigFileFinder(mockedapp.program, [])
+        config_finder = ConfigFileFinder(mockedapp.program)
         mock_config_finder.return_value = config_finder
 
         with mock.patch('flake8.main.application.Application') as application:

tests/unit/test_merged_config_parser.py

@@ -17,7 +17,7 @@ def optmanager():
 @pytest.fixture
 def config_finder():
     """Generate a simple ConfigFileFinder."""
-    return config.ConfigFileFinder('flake8', [])
+    return config.ConfigFileFinder('flake8')
 
 
 def test_parse_cli_config(optmanager, config_finder):