Test correct merging of composed metadata

tests/sources_example.yaml

@@ -2,10 +2,14 @@ SourceSplit:
     metadata:
         meta_0: Source metadata string example
         meta_1: Source metadata to be replaced by model
+        meta_2:
+            meta_20: Sub-metadata from Source
+            meta_21: Sub-metadata to be replaced by model
     ModelTCO3:
         metadata:
             meta_1: Model metadata string example
-            meta_2: 0
+            meta_2:
+                meta_21: Sub-metadata from model
         tco3_zm:
             name: tco3
             paths: SourceSplit/tco3_????.nc
@@ -19,7 +23,8 @@ SourceSplit:
     ModelVMRO3:
         metadata:
             meta_1: Model metadata string example
-            meta_2: 0
+            meta_2:
+                meta_21: Sub-metadata from model
         vmro3_zm:
             name: vmro3
             paths: SourceSplit/vmro3_????.nc
@@ -34,18 +39,22 @@ SourceSplit:
     ModelALL:
         metadata:
             meta_1: Model metadata string example
-            meta_2: 0
+            meta_2:
+                meta_21: Sub-metadata from model
         tco3_zm:
+            metadata:
+                meta_tco3_1: TCO3 metadata string example
+                meta_tco3_2: 0
             name: tco3
             paths: SourceSplit/tco3_????.nc
             coordinates:
                 time: time
                 lat: latitude
                 lon: longitude
-            metadata:
-                meta_tco3_1: TCO3 metadata string example
-                meta_tco3_2: 0
         vmro3_zm:
+            metadata:
+                meta_vmro3_1: VMRO3 metadata string example
+                meta_vmro3_2: 0
             name: vmro3
             paths: SourceSplit/vmro3_????.nc
             coordinates:
@@ -53,32 +62,37 @@ SourceSplit:
                 plev: pressure_level
                 lat: latitude
                 lon: longitude
-            metadata:
-                meta_vmro3_1: VMRO3 metadata string example
-                meta_vmro3_2: 0
 SourceMerged:
     metadata:
         meta_0: Source metadata string example
         meta_1: Source metadata to be replaced by model
+        meta_2:
+            meta_20: Sub-metadata from Source
+            meta_21: Sub-metadata to be replaced by model
     ModelTCO3:
         metadata:
             meta_1: Model metadata string example
-            meta_2: 0
+            meta_2:
+                meta_21: Sub-metadata from model
         tco3_zm:
+            metadata:
+                meta_tco3_1: TCO3 metadata string example
+                meta_tco3_2: 0
             name: tco3
             paths: SourceMerged/merged_????.nc
             coordinates:
                 time: time
                 lat: latitude
                 lon: longitude
-            metadata:
-                meta_tco3_1: TCO3 metadata string example
-                meta_tco3_2: 0
     ModelVMRO3:
         metadata:
             meta_1: Model metadata string example
-            meta_2: 0
+            meta_2:
+                meta_21: Sub-metadata from model
         vmro3_zm:
+            metadata:
+                meta_vmro3_1: VMRO3 metadata string example
+                meta_vmro3_2: 0
             name: vmro3
             paths: SourceMerged/merged_????.nc
             coordinates:
@@ -86,24 +100,25 @@ SourceMerged:
                 plev: pressure_level
                 lat: latitude
                 lon: longitude
-            metadata:
-                meta_vmro3_1: VMRO3 metadata string example
-                meta_vmro3_2: 0
     ModelALL:
         metadata:
             meta_1: Model metadata string example
-            meta_2: 0
+            meta_2:
+                meta_21: Sub-metadata from model
         tco3_zm:
+            metadata:
+                meta_tco3_1: TCO3 metadata string example
+                meta_tco3_2: 0
             name: tco3
             paths: SourceMerged/merged_????.nc
             coordinates:
                 time: time
                 lat: latitude
                 lon: longitude
-            metadata:
-                meta_tco3_1: TCO3 metadata string example
-                meta_tco3_2: 0
         vmro3_zm:
+            metadata:
+                meta_vmro3_1: VMRO3 metadata string example
+                meta_vmro3_2: 0
             name: vmro3
             paths: SourceMerged/merged_????.nc
             coordinates:
@@ -111,6 +126,3 @@ SourceMerged:
                 plev: pressure_level
                 lat: latitude
                 lon: longitude
-            metadata:
-                meta_vmro3_1: VMRO3 metadata string example
-                meta_vmro3_2: 0

tests/test_tco3.py

@@ -98,7 +98,9 @@ class TestSkimming_Common:
     def test_metadata_commons(self, metadata_dict, variable):
         assert metadata_dict["meta_0"] == "Source metadata string example"
         assert metadata_dict["meta_1"] == "Model metadata string example"
-        assert metadata_dict["meta_2"] == 0
+        submeta_dict = metadata_dict["meta_2"]
+        assert submeta_dict["meta_20"] == "Sub-metadata from Source"
+        assert submeta_dict["meta_21"] == "Sub-metadata from Model"
 
     @pytest.mark.parametrize('model_name', conftest.models_tco3, indirect=True)
     def test_metadata_tco3(self, metadata_dict, variable):

tests/test_vmro3.py

@@ -99,7 +99,9 @@ class TestSkimming_Common:
     def test_metadata_commons(self, metadata_dict, variable):
         assert metadata_dict["meta_0"] == "Source metadata string example"
         assert metadata_dict["meta_1"] == "Model metadata string example"
-        assert metadata_dict["meta_2"] == 0
+        submeta_dict = metadata_dict["meta_2"]
+        assert submeta_dict["meta_20"] == "Sub-metadata from Source"
+        assert submeta_dict["meta_21"] == "Sub-metadata from Model"
 
     @pytest.mark.parametrize('model_name', conftest.models_vmro3, indirect=True)
     def test_metadata_vmro3(self, metadata_dict, variable):