@cases_generator now has a default value for the names template, based on the parameters. Fixes #77

Author: Sylvain MARIE

pytest_cases/main_params.py

@@ -400,6 +400,11 @@ def _get_case_getter_s(f,
         already_used_names = []
 
         names, param_ids, all_param_values_combinations = gen
+        nb_cases_generated = len(all_param_values_combinations)
+
+        if names is None:
+            # default template based on parameter names
+            names = "%s__%s" % (f.__name__, ', '.join("%s={%s}" % (p_name, p_name) for p_name in param_ids))
 
         if isinstance(names, string_types):
             # then this is a string formatter creating the names. Create the corresponding callable
@@ -410,7 +415,6 @@ def names(**params):
                 except Exception:
                     raise InvalidNamesTemplateException(f, _formatter, params)
 
-        nb_cases_generated = len(all_param_values_combinations)
         if not callable(names):
             # This is an explicit list
             if len(names) != nb_cases_generated:

pytest_cases/tests/advanced/test_parameters.py

@@ -28,7 +28,7 @@ def case_simple2(version  # type: str
     return ins, outs, None
 
 
-@cases_generator("gen case i={i}, j={j}", i=range(2), j=range(2))
+@cases_generator(i=range(2), j=range(2))
 def case_gen(version,  # type: str,
              i, j):
     # type: (...) -> CaseData