How to use the rioxarray.merge.merge_arrays function in rioxarray

def test_merge_arrays__res():
    dem_test = os.path.join(TEST_INPUT_DATA_DIR, "MODIS_ARRAY.nc")
    with open_rasterio(dem_test, masked=True) as rds:
        rds.attrs = {
            "_FillValue": rds.rio.nodata,
            "grid_mapping": "spatial_ref",
            "crs": rds.attrs["crs"],
        }
        arrays = [
            rds.isel(x=slice(100), y=slice(100)),
            rds.isel(x=slice(100, 200), y=slice(100, 200)),
            rds.isel(x=slice(100), y=slice(100, 200)),
            rds.isel(x=slice(100, 200), y=slice(100)),
        ]
        merged = merge_arrays(arrays, res=(300, 300))

    assert_almost_equal(
        merged.rio.bounds(),
        (-7274009.649486291, 5003608.61015275, -7227509.649486291, 5050108.61015275),
    )
    assert_almost_equal(
        tuple(merged.rio.transform()),
        (300.0, 0.0, -7274009.649486291, 0.0, -300.0, 5050108.61015275, 0.0, 0.0, 1.0),
    )
    assert merged.rio._cached_transform() == merged.rio.transform()
    assert merged.rio.shape == (155, 155)
    assert merged.coords["band"].values == [1]
    assert sorted(merged.coords) == ["band", "spatial_ref", "x", "y"]
    assert merged.rio.crs == rds.rio.crs
    assert merged.attrs == rds.attrs
    assert_almost_equal(nansum(merged), 13556564)

def test_merge_arrays():
    dem_test = os.path.join(TEST_INPUT_DATA_DIR, "MODIS_ARRAY.nc")
    with open_rasterio(dem_test) as rds:
        rds.attrs = {
            "_FillValue": rds.rio.nodata,
            "grid_mapping": "spatial_ref",
            "crs": rds.attrs["crs"],
        }
        arrays = [
            rds.isel(x=slice(100), y=slice(100)),
            rds.isel(x=slice(100, 200), y=slice(100, 200)),
            rds.isel(x=slice(100), y=slice(100, 200)),
            rds.isel(x=slice(100, 200), y=slice(100)),
        ]
        merged = merge_arrays(arrays)

    assert_almost_equal(
        merged.rio.bounds(),
        (-7274009.649486291, 5003545.682141737, -7227446.721475236, 5050108.61015275),
    )
    assert_almost_equal(
        tuple(merged.rio.transform()),
        (
            231.6563582639536,
            0.0,
            -7274009.649486291,
            0.0,
            -231.65635826374404,
            5050108.61015275,
            0.0,
            0.0,