fix: (TestServices) usage of traceback.format_exception is corrected

tests/conftest_helpers.py

@@ -709,9 +709,8 @@ def Helper__ExceptionToHumanText__Single(exc: BaseException) -> str:
             err_msg = "Exception ({}).".format(type(exc).__name__)
             assert type(err_msg) is str
 
-            exc_info_lines = traceback.format_exception(exc)
-            assert type(exc_info_lines) is list
-            err_msg2 = "".join(exc_info_lines).strip()
+            err_msg2 = __class__.Helper__GetTraceBack(exc)
+            assert type(err_msg2) is str
 
             if err_msg2 != "":
                 err_msg += " " + err_msg2
@@ -793,10 +792,21 @@ def Helper__GetExcMsg(exc: BaseException) -> str:
         assert isinstance(exc, BaseException)
 
         if isinstance(exc, AssertionError):
-            exc_info_lines = traceback.format_exception(exc)
-            assert type(exc_info_lines) is list
-            return "".join(exc_info_lines).strip()
+            return __class__.Helper__GetTraceBack(exc)
 
         return str(exc)
 
+    # --------------------------------------------------------------------
+    @staticmethod
+    def Helper__GetTraceBack(exc: BaseException) -> str:
+        assert isinstance(exc, BaseException)
+
+        exc_info_lines = traceback.format_exception(
+            type(exc),
+            exc,
+            exc.__traceback__,
+        )
+        assert type(exc_info_lines) is list
+        return "".join(exc_info_lines).strip()
+
 # /////////////////////////////////////////////////////////////////////////////

tests/own/TestServices/test_set001__Helper__ExceptionToHumanText__Single.py

@@ -0,0 +1,22 @@
+from ...conftest_helpers import TestServices
+
+import pytest
+import logging
+
+
+class TestSet001__Helper__ExceptionToHumanText__Single:
+    def test_001(self):
+        with pytest.raises(expected_exception=AssertionError) as x:
+            v = 1
+            assert v == 2
+
+        assert isinstance(x.value, AssertionError)
+
+        msg = TestServices.Helper__ExceptionToHumanText__Single(x.value)
+
+        logging.info("msg: {}".format(msg))
+
+        assert "Exception (AssertionError)." in msg
+        assert "v == 2" in msg
+        assert "AssertionError: assert 1 == 2" in msg
+        return

tests/own/TestServices/test_set002__Helper__ExceptionToHumanText__Chain.py

@@ -0,0 +1,43 @@
+from ...conftest_helpers import TestServices
+
+import pytest
+import logging
+
+
+class TestSet002__Helper__ExceptionToHumanText__Chain:
+    def test_001(self):
+        with pytest.raises(expected_exception=AssertionError) as x:
+            v = 1
+            assert v == 2
+
+        assert isinstance(x.value, AssertionError)
+
+        msg = TestServices.Helper__ExceptionToHumanText__Chain(x.value)
+
+        logging.info("msg: {}".format(msg))
+
+        assert "---- 1. Exception (AssertionError):" in msg
+        assert "v == 2" in msg
+        assert "AssertionError: assert 1 == 2" in msg
+        return
+
+    def test_002(self):
+        with pytest.raises(expected_exception=AssertionError) as x:
+            v = 1
+            try:
+                raise RuntimeError("aaa")
+            except Exception:
+                assert v == 2
+
+        assert isinstance(x.value, AssertionError)
+
+        msg = TestServices.Helper__ExceptionToHumanText__Chain(x.value)
+
+        logging.info("msg: {}".format(msg))
+
+        assert "---- 1. Exception (RuntimeError):" in msg
+        assert "aaa" in msg
+        assert "---- 2. Exception (AssertionError):" in msg
+        assert "v == 2" in msg
+        assert "AssertionError: assert 1 == 2" in msg
+        return