Bugfix metadata deepcopy in source skim

o3skim/source.py

@@ -89,7 +89,8 @@ class Source:
             os.makedirs(dirname, exist_ok=True)
             logger.info("Skimming data from '%s'", dirname)
             with utils.cd(dirname):
-                metadata = self.metadata.copy()
+                metadata = {}  # copy() does not recurse inside dict
+                utils.mergedicts(metadata, self.metadata)
                 utils.mergedicts(metadata, self[model].model.metadata)
                 _skim(self[model], delta=groupby, metadata=metadata)
 

o3skim/test/test_utils.py

+import copy
 import unittest
 
 from o3skim import utils
@@ -10,7 +11,7 @@ dict_2 = {'b': 2, 'c': 3, 'z': {'b': 2, 'c': 3}}
 class Tests_mergedict(unittest.TestCase):
 
     def test_merge_d1d2(self):
-        dict_3 = dict_1.copy()
+        dict_3 = copy.deepcopy(dict_1)
         utils.mergedicts(dict_3, dict_2)
         self.assertEqual(dict_2, {'b': 2, 'c': 3, 'z': {'b': 2, 'c': 3}})
         self.assertEqual(dict_3['a'], 1)
@@ -19,8 +20,8 @@ class Tests_mergedict(unittest.TestCase):
         self.assertEqual(dict_3['z'], {'a': 1, 'b': 2, 'c': 3})
 
     def test_merge_d2d1(self):
-        dict_3 = dict_2.copy()
-        utils.mergedicts(dict_3, dict_1) 
+        dict_3 = copy.deepcopy(dict_2)
+        utils.mergedicts(dict_3, dict_1)
         self.assertEqual(dict_1, {'a': 1, 'c': 0, 'z': {'a': 1, 'c': 0}})
         self.assertEqual(dict_3['a'], 1)
         self.assertEqual(dict_3['b'], 2)