Try to improve tests coverage report

Author: mpiannucci

tests/test_metadata/test_consolidated.py

@@ -581,20 +581,30 @@ async def test_consolidated_metadata_encodes_special_chars(
     memory_store: Store, zarr_format: ZarrFormat, fill_value: float
 ):
     root = await group(store=memory_store, zarr_format=zarr_format)
+    _child = await root.create_group("child", attributes={"test": fill_value})
     _time = await root.create_array("time", shape=(12,), dtype=np.float64, fill_value=fill_value)
     await zarr.api.asynchronous.consolidate_metadata(memory_store)
 
     root = await group(store=memory_store, zarr_format=zarr_format)
     root_buffer = root.metadata.to_buffer_dict(default_buffer_prototype())
 
     if zarr_format == 2:
-        root_metadata = root_buffer[".zmetadata"].to_bytes().decode("utf-8")
+        root_metadata = json.loads(root_buffer[".zmetadata"].to_bytes().decode("utf-8"))["metadata"]
     elif zarr_format == 3:
-        root_metadata = root_buffer["zarr.json"].to_bytes().decode("utf-8")
+        root_metadata = json.loads(root_buffer["zarr.json"].to_bytes().decode("utf-8"))[
+            "consolidated_metadata"
+        ]["metadata"]
 
     if np.isnan(fill_value):
-        assert '"NaN"' in root_metadata
+        expected_fill_value = "NaN"
     elif np.isneginf(fill_value):
-        assert '"-Infinity"' in root_metadata
+        expected_fill_value = "-Infinity"
     elif np.isinf(fill_value):
-        assert '"Infinity"' in root_metadata
+        expected_fill_value = "Infinity"
+
+    if zarr_format == 2:
+        assert root_metadata["child/.zattrs"]["test"] == expected_fill_value
+        assert root_metadata["time/.zarray"]["fill_value"] == expected_fill_value
+    elif zarr_format == 3:
+        assert root_metadata["child"]["attributes"]["test"] == expected_fill_value
+        assert root_metadata["time"]["fill_value"] == expected_fill_value