chore(assert_failure): improve assertion text when raise an Assertion… (

#73)

* chore(assert_failure): improve assertion text when raise an AssertionException

* fix: static analysis error

meiga/assertions/assert_failure.py

@@ -13,9 +13,13 @@ def assert_failure(
         result.is_failure
     ), f"result is not failure as expected. Given failure value is {result.value}"
     if value_is_instance_of:
+        base = type(result.value)
+        if isinstance(base, type) and base == type:
+            base = result.value.__bases__
+
         assert isinstance(result.value, value_is_instance_of), (
             f"Value is not instance of {value_is_instance_of}. "
-            f"Given value is {result.value} of {type({result.value})}"
+            f"Given value is {result.value} of {base}"
         )
     if value_is_equal_to:
         assert result.value == value_is_equal_to, (

tests/unit/test_result_assertions.py

@@ -1,8 +1,14 @@
+from typing import Any
+
 import pytest
 
 from meiga import Error, Result
 
 
+class MyError(Error):
+    pass
+
+
 @pytest.mark.unit
 class TestResultAssertion:
     def should_assert_a_success(self):
@@ -25,6 +31,12 @@ def should_assert_a_failure_checking_instance(self):
         result = Result(failure=Error())
         result.assert_failure(value_is_instance_of=Error)
 
-    def test_should_assert_a_failure_result_checking_instance_and_value(self):
+    def should_assert_a_failure_result_checking_instance_and_value(self):
         result = Result(failure=5)
         result.assert_failure(value_is_instance_of=int, value_is_equal_to=5)
+
+    @pytest.mark.parametrize("error", [Error(), MyError(), Exception()])
+    def should_raise_an_assertion_error_when_instance_is_not_correct(self, error: Any):
+        result = Result(failure=error)  # type:ignore
+        with pytest.raises(AssertionError):
+            result.assert_failure(value_is_instance_of=bool)