fix(transforms.py): Fix load_from_file and add tests

ntc/node.py

@@ -386,6 +386,13 @@ def clear(self) -> None:
         for key in list(self.keys()):
             del self[key]
 
+    def update(self, new_dict: dict) -> None:
+        for key, value in new_dict.items():
+            if key in self and isinstance(self[key], (UserDict, dict)):
+                self[key].update(value)
+            else:
+                self[key] = value
+
 
 CN = CfgNode
 

tests/data/transforms/extra.yaml

@@ -0,0 +1,2 @@
+DICT:
+  FOO: "bar"

tests/data/transforms/load_from_file.py

@@ -0,0 +1,9 @@
+from pathlib import Path
+
+from ntc.transforms import load_from_file
+
+from ..base_cfg import cfg
+
+cfg = cfg.inherit()
+
+cfg.add_transform(load_from_file(Path(__file__).parent / "extra.yaml"))

tests/data/transforms/load_from_file_changes.py

@@ -0,0 +1,5 @@
+from ntc import CN
+from tests.data.transforms.load_from_file import cfg
+
+cfg = CN(cfg)
+cfg.DICT.FOO = "zoo"

tests/test_transforms.py

@@ -0,0 +1,10 @@
+from pathlib import Path
+
+from ntc import CN
+
+DATA_DIR = Path(__file__).parent / "data" / "transforms"
+
+
+def test_load_from_file():
+    cfg = CN.load(DATA_DIR / "load_from_file_changes.py")
+    assert cfg.DICT.FOO == "bar"