update codec tests

Author: d-v-b

tests/test_codecs/test_adler32.py

@@ -7,5 +7,13 @@
 @pytest.mark.filterwarnings("ignore::zarr.errors.ZarrUserWarning")
 class TestAdler32Codec(BaseTestCodec):
     test_cls = _numcodecs.Adler32
-    valid_json_v2 = ({"id": "adler32"},)
-    valid_json_v3 = ({"name": "adler32", "configuration": {}},)
+    valid_json_v2 = (
+        {"id": "adler32"},
+        {"id": "adler32", "location": "start"},
+        {"id": "adler32", "location": "end"},
+    )
+    valid_json_v3 = (
+        {"name": "adler32", "configuration": {}},
+        {"name": "adler32", "configuration": {"location": "start"}},
+        {"name": "adler32", "configuration": {"location": "end"}},
+    )

tests/test_codecs/test_zstd.py

@@ -33,11 +33,14 @@ class TestZstdCodec(BaseTestCodec):
 
     def test_checksum_removed(self) -> None:
         """
-        Test that the checksum field is not serialized to Zarr V2 JSON
+        Test that the checksum field is not serialized to Zarr V2 JSON when it is False
         """
         codec = self.test_cls(checksum=False)
         assert "checksum" not in codec.to_json(zarr_format=2)
 
+        codec = self.test_cls(checksum=True)
+        assert codec.to_json(zarr_format=2)["checksum"] is True
+
 
 @pytest.mark.parametrize("level", [1, 5, 9])
 @pytest.mark.parametrize("checksum", [True, False])