Merge pull request #564 from OumarCamara/fix/reset-force_failure

Clear force_failure in _reset()

Author: jelmer

NEWS

@@ -8,6 +8,9 @@ NEXT
 
 Improvements
 ------------
+* Clear ``force_failure`` in ``_reset()`` so that re-running a test
+  after an ``expectThat`` failure can succeed if successful conditions are met again.
+  (OumarCamara, #563)
 
 * Make ``extract_result()`` and ``DeferredNotFired`` public APIs in
   ``testtools.twistedsupport``. These utilities are useful for extracting

testtools/testcase.py

@@ -307,6 +307,9 @@ def _reset(self) -> None:
         # __details is lazy-initialized so that a constructed-but-not-run
         # TestCase is safe to use with clone_test_with_new_id.
         self.__details: DetailsDict | None = None
+        # force_failure is set by expectThat() on mismatch; must be
+        # cleared so re-runs of the same test can succeed.
+        self.force_failure: bool | None = None
 
     def __eq__(self, other: object) -> bool:
         eq = getattr(unittest.TestCase, "__eq__", None)