Add test for DictDefault

tests/test_dict.py

@@ -0,0 +1,91 @@
+import unittest
+
+import pytest
+
+from axolotl.utils.dict import DictDefault
+
+
+class DictDefaultTest(unittest.TestCase):
+    def test_dict_default(self):
+        cfg = DictDefault(
+            {
+                "key_a": {"key_b": "value_a"},
+                "key_c": "value_c",
+                "key_d": ["value_d", "value_e"],
+            }
+        )
+
+        assert (
+            cfg.key_a.key_b == "value_a"
+        ), "DictDefault should return value for existing nested keys"
+
+        assert (
+            cfg.key_c == "value_c"
+        ), "DictDefault should return value for existing keys"
+
+        assert (
+            cfg.key_d[0] == "value_d"
+        ), "DictDefault should return value for existing keys in list"
+
+        assert (
+            "value_e" in cfg.key_d,
+            "DictDefault should support in operator for existing keys in list",
+        )
+
+    def test_dict_or_operator(self):
+        cfg = DictDefault(
+            {
+                "key_a": {"key_b": "value_a"},
+                "key_c": "value_c",
+                "key_d": ["value_d", "value_e"],
+                "key_f": "value_f",
+            }
+        )
+
+        cfg = cfg | DictDefault({"key_a": {"key_b": "value_b"}, "key_f": "value_g"})
+
+        assert (
+            cfg.key_a.key_b == "value_b"
+        ), "DictDefault should support OR operator for existing nested keys"
+
+        assert cfg.key_c == "value_c", "DictDefault should not delete existing key"
+
+        assert cfg.key_d == [
+            "value_d",
+            "value_e",
+        ], "DictDefault should not overwrite existing keys in list"
+
+        assert (
+            cfg.key_f == "value_g"
+        ), "DictDefault should support OR operator for existing key"
+
+    def test_dict_missingkey(self):
+        cfg = DictDefault({})
+
+        assert cfg.random_key is None, "DictDefault should return None for missing keys"
+
+    def test_dict_nested_missingparentkey(self):
+        """
+        Due to subclassing Dict, DictDefault will error if we try to access a nested key whose parent key does not exist.
+        """
+        cfg = DictDefault({})
+
+        with pytest.raises(
+            AttributeError,
+            match=r"'NoneType' object has no attribute 'another_random_key'",
+        ):
+            cfg.random_key.another_random_key
+
+    def test_dict_shorthand_assignment(self):
+        """
+        Shorthand assignment is said to not be supported if subclassed. However, their example raises error instead of None.
+        This test ensures that it is supported for current implementation.
+
+        Ref: https://github.com/mewwts/addict#default-values
+        """
+
+        cfg = DictDefault({"key_a": {"key_b": "value_a"}})
+
+        cfg.key_a.key_b = "value_b"
+
+        assert cfg.key_a.key_b == "value_b", "Shorthand assignment should be supported"