Refactor pytest args in test runner

Author: Mauko Quiroga

openfisca_core/tools/test_runner.py

@@ -64,17 +64,15 @@ def run_tests(tax_benefit_system, paths, options = None):
 
     """
 
-    argv = []
-
-    if options.get('pdb'):
-        argv.append('--pdb')
-
-    if isinstance(paths, str):
+    if not hasattr(paths, "__setitem__"):
         paths = [paths]
 
-    if options is None:
+    if not hasattr(options, "__iter__"):
         options = {}
 
+    #: Check whether pytest args were passed to ``openfisca test``.
+    argv = [f"--{arg}" for arg, flag in _pytest_args(options) if flag is True]
+
     return pytest.main([*argv, *paths] if True else paths, plugins = [OpenFiscaPlugin(tax_benefit_system, options)])
 
 
@@ -285,3 +283,8 @@ def _get_tax_benefit_system(baseline, reforms, extensions):
     _tax_benefit_system_cache[key] = current_tax_benefit_system
 
     return current_tax_benefit_system
+
+
+def _pytest_args(options):
+    """Options we pass on to pytest if they're present."""
+    return ((k, v) for k, v in options.items() if k in {"pdb", "verbose"})