diff --git a/pyproject.toml b/pyproject.toml
index d806595..118e4c6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,7 +45,7 @@ repository = "https://github.com/HideyoshiNakazone/jambo.git"
 # POE Tasks
 [tool.poe.tasks]
 create-hooks        = "bash .githooks/set-hooks.sh"
-tests               = "python -m coverage run -m unittest -v"
+tests               = "python -m coverage run -m unittest discover -v"
 tests-report        = "python -m coverage xml"
 
 # Build System
diff --git a/tests/parser/test_allof_type_parser.py b/tests/parser/test_allof_type_parser.py
index 17ff3fa..2ae4bc2 100644
--- a/tests/parser/test_allof_type_parser.py
+++ b/tests/parser/test_allof_type_parser.py
@@ -183,6 +183,22 @@ class TestAllOfTypeParser(TestCase):
         with self.assertRaises(ValueError):
             AllOfTypeParser().from_properties("placeholder", properties)
 
+    def test_all_of_invalid_type_not_all_equal(self):
+        """
+        Tests that an error is raised when the allOf types are not all equal.
+        """
+
+        properties = {
+            "allOf": [
+                {"type": "string", "maxLength": 11},
+                {"type": "integer", "maxLength": 4},
+                {"type": "string", "minLength": 1},
+            ]
+        }
+
+        with self.assertRaises(ValueError):
+            AllOfTypeParser().from_properties("placeholder", properties)
+
     def test_all_of_description_field(self):
         """
         Tests the AllOfTypeParser with a description field.