application: Register preliminary options on a separate argument parser

We introduce a new `ArgumentParser` for registering the preliminary
options to be inherited by the `Application.option_manager`.  The next
step will be to use the `Application.prelim_arg_parser` for parsing and
handling preliminary options and arguments.

Note that we prevent the preliminary parser from handling `-h/--help`
and defer to that to the primary parser.

1 files changed, 4 insertions, 1 deletions

diff --git a/tests/integration/test_aggregator.py b/tests/integration/test_aggregator.py
index 5af24ef..d2c0133 100644
--- a/tests/integration/test_aggregator.py
+++ b/tests/integration/test_aggregator.py
@@ -1,4 +1,5 @@
 """Test aggregation of config files and command-line options."""
+import argparse
 import os
 
 import pytest
@@ -14,11 +15,13 @@ CLI_SPECIFIED_CONFIG = 'tests/fixtures/config_files/cli-specified.ini'
 @pytest.fixture
 def optmanager():
     """Create a new OptionManager."""
+    prelim_parser = argparse.ArgumentParser(add_help=False)
+    options.register_preliminary_options(prelim_parser)
     option_manager = manager.OptionManager(
         prog='flake8',
         version='3.0.0',
+        parents=[prelim_parser],
     )
-    options.register_preliminary_options(option_manager)
     options.register_default_options(option_manager)
     return option_manager