diff --git a/tests/unit/core/python/_core/test_PythonDocumentationGenerator.py b/tests/unit/core/python/_core/test_PythonDocumentationGenerator.py
index 5091baf..75a6ffc 100644
--- a/tests/unit/core/python/_core/test_PythonDocumentationGenerator.py
+++ b/tests/unit/core/python/_core/test_PythonDocumentationGenerator.py
@@ -17,19 +17,20 @@ from src.jcloud_docsgen.core.python.namespaces import PythonModuleNamespace, Pyt
 import pytest
 from src.jcloud_docsgen.utils import ExistingDirectory
 
-@pytest.mark.parametrize('project_directory,docs_directory', [
-    (1, 1),
-    (1, None),
-    (42, None),
-    (ExistingDirectory('tests'), 1),
-    (ExistingDirectory('tests/'), 1),
-    (1, ExistingDirectory('tests/')),
-    (1, ExistingDirectory('tests')),
-    (None, ExistingDirectory('tests')),
+@pytest.mark.parametrize('project_directory,docs_directory,expected_exception,expected_exception_msg', [
+    (1, 1, TypeError, 'expected \'ExistingDirectory\', got \'int\''),
+    (1, None, TypeError, 'expected \'ExistingDirectory\', got \'int\''),
+    (42, None, TypeError, 'expected \'ExistingDirectory\', got \'int\''),
+    (ExistingDirectory('tests'), 1, TypeError, 'expected \'ExistingDirectory\', got \'int\''),
+    (ExistingDirectory('tests/'), 1, TypeError, 'expected \'ExistingDirectory\', got \'int\''),
+    (1, ExistingDirectory('tests/'), TypeError, 'expected \'ExistingDirectory\', got \'int\''),
+    (1, ExistingDirectory('tests'), TypeError, 'expected \'ExistingDirectory\', got \'int\''),
+    (None, ExistingDirectory('tests'), TypeError, 'expected \'ExistingDirectory\', got \'NoneType\''),
 ])
-def test_PythonDocumentationGenerator_type_exceptions(project_directory, docs_directory):
-    with pytest.raises(TypeError):
+def test_PythonDocumentationGenerator_exceptions(project_directory, docs_directory, expected_exception, expected_exception_msg):
+    with pytest.raises(expected_exception) as exc_info:
         PythonDocumentationGenerator(project_directory, docs_directory)
+    assert str(exc_info.value) == expected_exception_msg
 
 @pytest.mark.parametrize('python_documentation_generator,expected', [
     (PythonDocumentationGenerator(ExistingDirectory('tests/unit/core/python/_core/test_project_dirs/pdir_1'), ExistingDirectory('tests/unit/core/python/_core/test_project_dirs/pdir_1/docs')), []),