fix: check message attribute in error representation (#25)

* tests: add test to check error representation without message attr

* fix: check message attribute in error representation

meiga/error.py

@@ -9,7 +9,7 @@ def __eq__(self, other) -> bool:
 
     def __repr__(self) -> str:
         suffix = ""
-        if self.message:
+        if hasattr(self, "message") and self.message is not None:
             suffix = f": {self.message}"
 
         return f"{self.__class__.__name__}{suffix}"

tests/unit/test_error.py

@@ -25,3 +25,14 @@ def __init__(self, message: str):
         f"Result[status: failure | value: ErrorWithMessage: {given_any_message}]"
         == result.__repr__()
     )
+
+
+@pytest.mark.unit
+def test_should_repr_as_expected_an_error_without_message_attribute():
+    class ErrorWithOutMessage(Error):
+        def __init__(self):
+            pass
+
+    result = Result(failure=ErrorWithOutMessage())
+
+    assert "Result[status: failure | value: ErrorWithOutMessage]" == result.__repr__()