Add OmeroMetadataAccessTest

Locks down how omero metadata (channel labels, default channel /
timepoint, render windows) is read from both v0.4 and v0.5 OME-Zarr
fixtures, guarding against backend regressions.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: stefanhahmann

src/test/java/sc/fiji/ome/zarr/pyramid/OmeroMetadataAccessTest.java

@@ -0,0 +1,77 @@
+package sc.fiji.ome.zarr.pyramid;
+
+import dev.zarr.zarrjava.ZarrException;
+import dev.zarr.zarrjava.experimental.ome.MultiscaleImage;
+import dev.zarr.zarrjava.experimental.ome.metadata.OmeroChannel;
+import dev.zarr.zarrjava.experimental.ome.metadata.OmeroMetadata;
+import dev.zarr.zarrjava.experimental.ome.metadata.OmeroRdefs;
+import dev.zarr.zarrjava.experimental.ome.metadata.OmeroWindow;
+import dev.zarr.zarrjava.store.FilesystemStore;
+import dev.zarr.zarrjava.store.StoreHandle;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+import sc.fiji.ome.zarr.util.ZarrTestUtils;
+
+import java.io.IOException;
+import java.net.URISyntaxException;
+import java.nio.file.Path;
+import java.util.List;
+import java.util.stream.Stream;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class OmeroMetadataAccessTest
+{
+	static Stream< String > omeZarr5dExamples()
+	{
+		return Stream.of(
+				"sc/fiji/ome/zarr/util/5d_testing/5d_dataset_v4.ome.zarr",
+				"sc/fiji/ome/zarr/util/5d_testing/5d_dataset_v5.ome.zarr"
+		);
+	}
+
+	@ParameterizedTest
+	@MethodSource( "omeZarr5dExamples" )
+	void testCanAccessOmeroMetadataWithExperimentalOme( final String resource ) throws URISyntaxException, IOException, ZarrException
+	{
+		final Path path = ZarrTestUtils.resourcePath( resource );
+		final FilesystemStore store = new FilesystemStore( path.toString() );
+		final StoreHandle handle = store.resolve();
+		final MultiscaleImage multiscaleImage = MultiscaleImage.open( handle );
+
+		final OmeroMetadata omero = multiscaleImage.getOmeroMetadata();
+
+		assertNotNull( omero );
+		assertEquals( Integer.valueOf( 1 ), omero.id );
+		assertEquals( "0.4", omero.version );
+
+		final OmeroRdefs rdefs = omero.rdefs;
+		assertNotNull( rdefs );
+		assertEquals( Integer.valueOf( 1 ), rdefs.defaultT );
+		assertEquals( Integer.valueOf( 71 ), rdefs.defaultZ );
+		assertEquals( "color", rdefs.model );
+
+		final List< OmeroChannel > channels = omero.channels;
+		assertNotNull( channels );
+		assertEquals( 3, channels.size() );
+
+		final OmeroChannel channel0 = channels.get( 0 );
+		assertEquals( "lynEGFP", channel0.label );
+		assertEquals( "00FF00", channel0.color );
+		assertWindow( channel0.window, 0.0, 255.0, 3.0, 246.0 );
+
+		final OmeroChannel channel1 = channels.get( 1 );
+		assertEquals( "NLStdTomato", channel1.label );
+		assertEquals( "FF0000", channel1.color );
+		assertWindow( channel1.window, 0.0, 255.0, 6.0, 133.0 );
+	}
+
+	private void assertWindow( final OmeroWindow window, final double min, final double max, final double start, final double end )
+	{
+		assertNotNull( window );
+		assertEquals( min, window.min );
+		assertEquals( max, window.max );
+		assertEquals( start, window.start );
+		assertEquals( end, window.end );
+	}
+}