fix tests

Author: d-v-b

src/zarr/core/metadata/v2.py

@@ -158,7 +158,12 @@ def from_dict(cls, data: dict[str, Any]) -> ArrayV2Metadata:
     def to_dict(self) -> dict[str, JSON]:
         zarray_dict = super().to_dict()
         if isinstance(zarray_dict["compressor"], numcodecs.abc.Codec):
-            zarray_dict["compressor"] = zarray_dict["compressor"].get_config()
+            codec_config = zarray_dict["compressor"].get_config()
+            # Hotfix for https://github.com/zarr-developers/zarr-python/issues/2647
+            if codec_config["id"] == "zstd" and not codec_config.get("checksum", False):
+                codec_config.pop("checksum")
+            zarray_dict["compressor"] = codec_config
+
         if zarray_dict["filters"] is not None:
             raw_filters = zarray_dict["filters"]
             new_filters = []

tests/test_metadata/test_dtype.py

@@ -116,7 +116,7 @@ def test_dict_serialization(wrapper_cls: DTYPE) -> None:
         (Complex64(), np.complex64(0)),
         (Complex128(), np.complex128(0)),
         (FixedLengthAsciiString(length=3), np.bytes_(b"")),
-        (StaticRawBytes(length=3), np.void(b"")),
+        (StaticRawBytes(length=3), np.void(b"\x00\x00\x00")),
         (FixedLengthUnicodeString(length=3), np.str_("")),
         (
             Structured(fields=(("a", Float64(), 0), ("b", Int8(), 8))),

tests/test_metadata/test_v2.py

@@ -19,8 +19,6 @@
 
     from zarr.abc.codec import Codec
 
-import numcodecs
-
 
 def test_parse_zarr_format_valid() -> None:
     assert parse_zarr_format(2) == 2
@@ -33,8 +31,8 @@ def test_parse_zarr_format_invalid(data: Any) -> None:
 
 
 @pytest.mark.parametrize("attributes", [None, {"foo": "bar"}])
-@pytest.mark.parametrize("filters", [None, (numcodecs.GZip(),)])
-@pytest.mark.parametrize("compressor", [None, numcodecs.GZip()])
+@pytest.mark.parametrize("filters", [None, [{"id": "gzip", "level": 1}]])
+@pytest.mark.parametrize("compressor", [None, {"id": "gzip", "level": 1}])
 @pytest.mark.parametrize("fill_value", [None, 0, 1])
 @pytest.mark.parametrize("order", ["C", "F"])
 @pytest.mark.parametrize("dimension_separator", [".", "/", None])