Fixed bug with @pytest_fixture_plus when used in parametrized mode. Fixes #26

Added test.

Author: Sylvain MARIE

pytest_cases/main.py

@@ -364,8 +364,8 @@ def _get_arguments(*args, **kwargs):
     old_sig = signature(fixture_func)
     new_sig = remove_signature_parameters(old_sig, *old_parameter_names)
     # add them in reversed order so as to match the same test order than in pytest.
-    new_sig = add_signature_parameters(new_sig, first=(Parameter(n, kind=Parameter.POSITIONAL_OR_KEYWORD)
-                                                       for n in reversed(new_parameter_names)))
+    new_sig = add_signature_parameters(new_sig, first=tuple(Parameter(n, kind=Parameter.POSITIONAL_OR_KEYWORD)
+                                                            for n in reversed(new_parameter_names)))
 
     # Finally create the fixture function, a wrapper of user-provided fixture with the new signature
     if not isgeneratorfunction(fixture_func):

pytest_cases/tests/simple/test_fixtures_params.py

@@ -0,0 +1,18 @@
+from pytest_cases import pytest_fixture_plus
+import pytest
+
+
+@pytest_fixture_plus(scope="module")
+@pytest.mark.parametrize("arg1", [
+    "one", "two"
+])
+@pytest.mark.parametrize("arg2", [
+    "one", "two"
+])
+def myfix(arg1, arg2):
+    return (arg1, arg2)
+
+
+def test_one(myfix):
+    print(myfix)
+