test: build ngff multiscales v0.4 metadata

src/test/java/org/janelia/saalfeldlab/n5/universe/metadata/ome/ngff/v04/BuildMultiscaleTest.java

@@ -0,0 +1,43 @@
+package org.janelia.saalfeldlab.n5.universe.metadata.ome.ngff.v04;
+
+import static org.junit.Assert.assertEquals;
+
+import org.janelia.saalfeldlab.n5.universe.metadata.axes.Axis;
+import org.janelia.saalfeldlab.n5.universe.metadata.axes.AxisUtils;
+import org.junit.Test;
+
+public class BuildMultiscaleTest {
+
+	@Test
+	public void buildMultiscaleRoot() {
+
+		final String path = "";
+		final String downsampleMethod = "sampling";
+
+		final Axis[] axes = AxisUtils.buildAxes("x", "y", "z");
+		final OmeNgffMultiScaleMetadataMutable ms = new OmeNgffMultiScaleMetadataMutable("");
+
+		final String[] paths = new String[]{"s0", "s1", "s2", "s3"};
+		ms.addChild(buildScaleLevelMetadata(paths[0], new double[]{1, 1, 1}, axes));
+		ms.addChild(buildScaleLevelMetadata(paths[1], new double[]{2, 2, 2}, axes));
+		ms.addChild(buildScaleLevelMetadata(paths[2], new double[]{4, 4, 4}, axes));
+		ms.addChild(buildScaleLevelMetadata(paths[3], new double[]{8, 8, 8}, axes));
+
+		final OmeNgffMultiScaleMetadata meta = new OmeNgffMultiScaleMetadata(ms.getAxes().length,
+				path, path, downsampleMethod, "0.4",
+				ms.getAxes(),
+				ms.getDatasets(), null,
+				ms.coordinateTransformations, ms.metadata, true);
+
+		for( int i = 0; i < 4; i++ ) {
+			assertEquals( paths[i], meta.getDatasets()[i].path );
+		}
+	}
+
+	private static NgffSingleScaleAxesMetadata buildScaleLevelMetadata(final String path, final double[] res,
+			final Axis[] axes)	{
+
+		return new NgffSingleScaleAxesMetadata(path, res, null, axes, null);
+	}
+
+}