Fixed wrong module string decomposition when passed to cases argument in @parametrize_with_cases. Fixes #113

Author: Sylvain MARIE

pytest_cases/case_parametrizer_new.py

@@ -155,10 +155,13 @@ def get_all_cases(parametrization_target,  # type: Callable
         needs to be selected.
     """
     # Handle single elements
-    try:
-        cases = tuple(cases)
-    except TypeError:
+    if isinstance(cases, string_types):
         cases = (cases,)
+    else:
+        try:
+            cases = tuple(cases)
+        except TypeError:
+            cases = (cases,)
 
     # validate prefix
     if not isinstance(prefix, str):