feat: adds simple tests for internal exceptions

tests/exceptions/test_internal_assertion_exception.py

@@ -0,0 +1,21 @@
+from jambo.exceptions.internal_assertion_exception import InternalAssertionException
+
+from unittest import TestCase
+
+
+class TestInternalAssertionException(TestCase):
+    def test_inheritance(self):
+        self.assertTrue(issubclass(InternalAssertionException, AssertionError))
+
+    def test_message(self):
+        message = "This is an internal assertion error."
+
+        expected_message = (
+            f"Internal Assertion Failed: {message}\n"
+            "This is likely a bug in Jambo. Please report it at"
+        )
+
+        with self.assertRaises(InternalAssertionException) as ctx:
+            raise InternalAssertionException(message)
+
+        self.assertEqual(str(ctx.exception), expected_message)