test(utils): Add test for safe_str and safe_repr when fail

Fixes GH-3515

Author: mgaligniana

tests/test_utils.py

@@ -646,6 +646,17 @@ def test_get_error_message(error, expected_result):
     assert get_error_message(exc_value) == expected_result(exc_value)
 
 
+def test_safe_str_fails():
+    class ExplodingStr:
+        def __str__(self):
+            raise Exception
+
+    obj = ExplodingStr()
+    result = safe_str(obj)
+
+    assert result == repr(obj)
+
+
 def test_installed_modules():
     try:
         from importlib.metadata import distributions, version

tests/utils/test_general.py

@@ -39,6 +39,17 @@ def test_safe_repr_regressions():
     assert "лошадь" in safe_repr("лошадь")
 
 
+def test_safe_repr_fails():
+    class ExplodingRepr:
+        def __repr__(self):
+            raise Exception
+
+    obj = ExplodingRepr()
+    result = safe_repr(obj)
+
+    assert result == "<broken repr>"
+
+
 @pytest.mark.parametrize("prefix", ("", "abcd", "лошадь"))
 @pytest.mark.parametrize("character", "\x00\x07\x1b\n")
 def test_safe_repr_non_printable(prefix, character):