Empty case ids are now replaced with '<<empty_case_id>' to avoid ambiguous interpretation of test ids. Fixes #142

Author: Sylvain MARIE

pytest_cases/case_funcs_new.py

@@ -67,6 +67,9 @@ def get_from(cls, case_func, create=False, prefix_for_ids='case_'):
                     case_info.id = case_func.__name__[len(prefix_for_ids):]
                 else:
                     case_info.id = case_func.__name__
+                # default case id for empty id
+                if len(case_info.id) == 0:
+                    case_info.id = "<empty_case_id>"
 
         return case_info
 

pytest_cases/tests/cases/issues/test_issue_142.py

@@ -0,0 +1,21 @@
+import pytest
+
+from pytest_cases import parametrize_with_cases
+
+
+@pytest.mark.parametrize('dummy_amount', [1, 0, -1])
+def case_amount(dummy_amount):
+    return dummy_amount
+
+
+@parametrize_with_cases('dummy_amount', cases=".", prefix="case_amount")
+def test_empty_prefix(dummy_amount):
+    pass
+
+
+def test_synthesis(module_results_dct):
+    assert list(module_results_dct) == [
+        'test_empty_prefix[<empty_case_id>-1]',
+        'test_empty_prefix[<empty_case_id>-0]',
+        'test_empty_prefix[<empty_case_id>--1]'
+    ]