improve test_sharding_with_chunks_per_shard

tests/test_codecs/test_sharding.py

@@ -396,22 +396,24 @@ async def test_sharding_with_empty_inner_chunk(
 
 @pytest.mark.parametrize("store", ["local", "memory"], indirect=["store"])
 @pytest.mark.parametrize(
-    "index_location", [ShardingCodecIndexLocation.start, ShardingCodecIndexLocation.end]
+    "index_location", [ShardingCodecIndexLocation.start, ShardingCodecIndexLocation.end],
 )
-async def test_sharding2(store: Store, index_location: ShardingCodecIndexLocation) -> None:
-    shape = (10, 2)
+@pytest.mark.parametrize("chunks_per_shard", [(5,2), (2,5), (5,5)])
+async def test_sharding_with_chunks_per_shard(store: Store, index_location: ShardingCodecIndexLocation, chunks_per_shard: tuple) -> None:
+    chunk_shape = (2,1)
+    shape = [x*y for x,y in zip(chunks_per_shard, chunk_shape, strict=False)]
     data = np.ones(np.prod(shape), dtype="int32").reshape(shape)
     fill_value = 42
 
-    path = f"test_sharding_2{index_location}"
+    path = f"test_sharding_with_chunks_per_shard_{index_location}"
     spath = StorePath(store, path)
     a = Array.create(
         spath,
         shape=shape,
         chunk_shape=shape,
         dtype="int32",
         fill_value=fill_value,
-        codecs=[ShardingCodec(chunk_shape=(2, 1), index_location=index_location)],
+        codecs=[ShardingCodec(chunk_shape=chunk_shape, index_location=index_location)],
     )
     a[...] = data
     data_read = a[...]