ArgSuite: do not test options.config_file

Author: elazarg

mypy/options.py

@@ -131,7 +131,7 @@ def __init__(self) -> None:
         self.scripts_are_modules = False
 
         # Config file name
-        self.config_file = 'setup.cfg'  # type: Optional[str]
+        self.config_file = None  # type: Optional[str]
 
         # Write junit.xml to given file
         self.junit_xml = None  # type: Optional[str]

mypy/test/testargs.py

@@ -14,4 +14,6 @@ class ArgSuite(Suite):
     def test_coherence(self) -> None:
         options = Options()
         _, parsed_options = process_options([], require_targets=False)
+        # FIX: test this too. Requires changing working dir to avoid finding 'setup.cfg'
+        options.config_file = parsed_options.config_file
         assert_equal(options, parsed_options)