Big restructuring

tests/unit/test_merge_mapping.py

@@ -0,0 +1,45 @@
+import unittest
+from filter_plugins.merge_mapping import merge_mapping
+from ansible.errors import AnsibleFilterError
+
+class TestMergeMappingFilter(unittest.TestCase):
+    def test_basic_merge_overwrites_and_adds(self):
+        list1 = [
+            {'source': 'a', 'target': 1},
+            {'source': 'b', 'target': 2},
+        ]
+        list2 = [
+            {'source': 'b', 'target': 3},
+            {'source': 'c', 'target': 4},
+        ]
+        result = merge_mapping(list1, list2, 'source')
+        result_dict = {item['source']: item['target'] for item in result}
+        self.assertEqual(result_dict, {'a': 1, 'b': 3, 'c': 4})
+
+    def test_merge_preserves_and_overwrites_fields(self):
+        list1 = [{'source': 'x', 'value': 100, 'flag': True}]
+        list2 = [{'source': 'x', 'value': 200, 'note': 'updated'}]
+        result = merge_mapping(list1, list2, 'source')
+        self.assertEqual(len(result), 1)
+        merged = result[0]
+        self.assertEqual(merged['value'], 200)
+        self.assertTrue(merged['flag'])
+        self.assertEqual(merged['note'], 'updated')
+
+    def test_empty_lists_return_empty(self):
+        self.assertEqual(merge_mapping([], [], 'source'), [])
+
+    def test_missing_key_raises_error(self):
+        list1 = [{'target': 'no_source'}]
+        list2 = []
+        with self.assertRaises(AnsibleFilterError):
+            merge_mapping(list1, list2, 'source')
+
+    def test_non_list_inputs_raise_error(self):
+        with self.assertRaises(AnsibleFilterError):
+            merge_mapping("not a list", [], 'source')
+        with self.assertRaises(AnsibleFilterError):
+            merge_mapping([], "not a list", 'source')
+
+if __name__ == '__main__':
+    unittest.main()