feat: add test_exception.py.twig

Signed-off-by: Jay <jaykumar20march@gmail.com>

Author: 35C4n0r

templates/python/tests/package/test_exception.py.twig

@@ -0,0 +1,12 @@
+from ...{{ spec.title | caseSnake}}.exception import ErrorType
+import unittest
+
+
+class TestErrorEnum(unittest.TestCase):
+
+    def test_enum_values(self):
+    {% for error in spec.definitions.appwriteException.errorTypes %}
+    self.assertEqual(ErrorType.{{ error.type|title|replace({'_': ''}) }}.value, '{{ error.type }}')
+    {% endfor %}
+
+