Add repr() calls to "invalid value" exception message in StrConverter.to_bool (#2666)

* Use !r and repr to make exception messages clearer.

* Use !r and repr to make exception messages clearer. Add changelog file

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Reverted repr() on VALID_BOOL list; updated relevant test

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Fixed test-breaking typo

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: ptmcg

docs/changelog/2665.bugfix.rst

@@ -0,0 +1 @@
+Use ``!r`` and ``repr()`` to better display erroneous values in exception from ``StrConverter.to_bool()`` - by :user:`ptmcg`.

src/tox/config/loader/str_convert.py

@@ -81,13 +81,15 @@ def to_env_list(value: str) -> EnvList:
 
     @staticmethod
     def to_bool(value: str) -> bool:
-        norm = value.strip().lower()
+        norm = str(value).strip().lower()
         if norm in StrConvert.TRUTHFUL_VALUES:
             return True
         elif norm in StrConvert.FALSE_VALUES:
             return False
         else:
-            raise TypeError(f"value {value} cannot be transformed to bool, valid: {', '.join(StrConvert.VALID_BOOL)}")
+            raise TypeError(
+                f"value {value!r} cannot be transformed to bool, valid: {', '.join(StrConvert.VALID_BOOL)}",
+            )
 
 
 __all__ = ("StrConvert",)

tests/config/test_sets.py

@@ -89,7 +89,7 @@ def test_config_bad_bool(conf_builder: ConfBuilder) -> None:
     config_set.add_config(keys="bad_bool", of_type=bool, default=False, desc="bad_bool")
     with pytest.raises(TypeError) as context:
         assert config_set["bad_bool"]
-    error = "value whatever cannot be transformed to bool, valid: , 0, 1, false, no, off, on, true, yes"
+    error = "value 'whatever' cannot be transformed to bool, valid: , 0, 1, false, no, off, on, true, yes"
     assert str(context.value) == error