add integration test

tests/integration/imzml_parser/test_ome_tiff_roundtrip.py

@@ -0,0 +1,32 @@
+import numpy as np
+import pytest
+import xarray
+from xarray import DataArray
+
+from depiction.persistence.format_ome_tiff import OmeTiff
+from depiction.persistence.pixel_size import PixelSize
+
+
+@pytest.fixture
+def sample_data() -> DataArray:
+    sizes = (2, 3, 4)
+    return DataArray(
+        np.arange(np.prod(sizes), dtype=float).reshape(sizes),
+        dims=["c", "y", "x"],
+        attrs={"pixel_size": PixelSize(10.0, 20.0, "micrometer")},
+        coords={"c": ["a", "b"]},
+    )
+
+
+def test_round_trip(sample_data, tmp_path):
+    out_path = tmp_path / "test.ome.tiff"
+
+    # write the file
+    OmeTiff.write(sample_data, out_path)
+    assert out_path.stat().st_size > 0
+
+    # read the file
+    read_data = OmeTiff.read(out_path)
+
+    # check the data
+    xarray.testing.assert_identical(read_data, sample_data)