Fixed issues when parametrize argnames contains a list. Fixed #49

Added corresponding test.
New util method `get_param_argnames_as_list` used everywhere.

pytest_cases/common.py

@@ -46,6 +46,18 @@ def get_fixture_name(fixture_fun):
             return str(fixture_fun)
 
 
+def get_param_argnames_as_list(argnames):
+    """
+    pytest parametrize accepts both coma-separated names and list/tuples.
+    This function makes sure that we always return a list
+    :param argnames:
+    :return:
+    """
+    if isinstance(argnames, str):
+        argnames = argnames.replace(' ', '').split(',')
+    return list(argnames)
+
+
 # ------------ container for the mark information that we grab from the fixtures (`@pytest_fixture_plus`)
 class _ParametrizationMark:
     """
@@ -55,7 +67,7 @@ class _ParametrizationMark:
 
     def __init__(self, mark):
         bound = get_parametrize_signature().bind(*mark.args, **mark.kwargs)
-        self.param_names = bound.arguments['argnames'].replace(' ', '').split(',')
+        self.param_names = get_param_argnames_as_list(bound.arguments['argnames'])
         self.param_values = bound.arguments['argvalues']
         try:
             bound.apply_defaults()
@@ -107,7 +119,7 @@ def get_param_names(fnode):
     p_markers = get_parametrization_markers(fnode)
     param_names = []
     for paramz_mark in p_markers:
-        param_names += paramz_mark.args[0].replace(' ', '').split(',')
+        param_names += get_param_argnames_as_list(paramz_mark.args[0])
     return param_names
 
 

pytest_cases/main_fixtures.py

@@ -39,7 +39,7 @@
     pass
 
 from pytest_cases.common import yield_fixture, get_pytest_parametrize_marks, get_test_ids_from_param_values, \
-    make_marked_parameter_value, extract_parameterset_info, get_fixture_name
+    make_marked_parameter_value, extract_parameterset_info, get_fixture_name, get_param_argnames_as_list
 from pytest_cases.main_params import cases_data
 
 
@@ -167,7 +167,7 @@ def param_fixtures(argnames, argvalues, autouse=False, ids=None, scope="function
     :return:
     """
     created_fixtures = []
-    argnames_lst = argnames.replace(' ', '').split(',')
+    argnames_lst = get_param_argnames_as_list(argnames)
 
     caller_module = get_caller_module()
 
@@ -763,7 +763,7 @@ def pytest_parametrize_plus(argnames, argvalues, indirect=False, ids=None, scope
     else:
         # there are fixture references: we have to create a specific decorator
         caller_module = get_caller_module()
-        all_param_names = argnames.replace(' ', '').split(',')
+        all_param_names = get_param_argnames_as_list(argnames)
 
         def create_param_fixture(from_i, to_i, p_fix_name):
             """ Routine that will be used to create a parameter fixture for argvalues between prev_i and i"""

pytest_cases/plugin.py

@@ -8,7 +8,7 @@
 import pytest
 
 from pytest_cases.common import get_pytest_nodeid, get_pytest_function_scopenum, \
-    is_function_node, get_param_names, get_pytest_scopenum
+    is_function_node, get_param_names, get_pytest_scopenum, get_param_argnames_as_list
 from pytest_cases.main_fixtures import NOT_USED, is_fixture_union_params, UnionFixtureAlternative, apply_id_style
 
 try:  # python 3.3+
@@ -708,7 +708,7 @@ def create_call_list_from_pending_parametrizations(self):
 
         # ------ parametrize the calls --------
         # create a dictionary of pending things to parametrize, and only keep the first parameter in case of several
-        pending_items = [(str(p[0]).replace(' ', '').split(',')[0], p) for p in self._pending]
+        pending_items = [(get_param_argnames_as_list(p[0])[0], p) for p in self._pending]
         pending = OrderedDict(pending_items)
 
         if _DEBUG:
@@ -766,7 +766,7 @@ def _cleanup_calls_list(self, fix_closure_tree, calls, nodes, pending):
                                                                indirect=True, discard_id=True,
                                                                scope=p_to_apply.scope, **p_to_apply.kwargs)
                     else:
-                        _nb_argnames = len(p_to_apply.argnames.split(','))
+                        _nb_argnames = len(get_param_argnames_as_list(p_to_apply.argnames))
                         if _nb_argnames > 1:
                             _vals = [(NOT_USED,) * _nb_argnames]
                         else:

pytest_cases/tests/issues/test_parametrize_with_lists.py

@@ -0,0 +1,20 @@
+import pytest
+from pytest_cases import pytest_fixture_plus
+
+
+@pytest_fixture_plus
+@pytest.mark.parametrize(['c', 'd'], [(0, 0), (1, 1)])
+def f(c, d):
+    pass
+
+
+@pytest.mark.parametrize(['a', 'b'], [(0, 0), (1, 1)])
+def test_dummy(a, b, f):
+    pass
+
+
+def test_synthesis(module_results_dct):
+    assert list(module_results_dct) == ["test_dummy[0-0-0-0]",
+                                        "test_dummy[0-0-1-1]",
+                                        "test_dummy[1-1-0-0]",
+                                        "test_dummy[1-1-1-1]"]