Refactor pyramid tests as a JUnit 5 interface and split per backend

Replaces the single DefaultPyramidal5DImageDataTest with:

- Pyramidal5DImageDataTestBase, a JUnit 5 test interface holding all
  shared parameterized tests as default methods. The single abstract
  method load(resource, context, preferredWidth) supplies a backend-
  configured Pyramidal5DImageDataImpl.
- N5BackedPyramidal5DImageDataTest and
  ZarrJavaBackedPyramidal5DImageDataTest, two thin classes that
  implement the interface by constructing the matching PyramidBackend.

The interface form means each concrete test class shows up as a
runnable JUnit class in IntelliJ, so individual test methods can be
launched directly. Both backends now run the full shared suite
against the same OME-Zarr v0.4 / v0.5 fixtures.

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

Author: stefanhahmann

src/test/java/sc/fiji/ome/zarr/pyramid/N5BackedPyramidal5DImageDataTest.java

@@ -0,0 +1,49 @@
+/*-
+ * #%L
+ * OME-Zarr extras for Fiji
+ * %%
+ * Copyright (C) 2022 - 2026 SciJava developers
+ * %%
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ * #L%
+ */
+package sc.fiji.ome.zarr.pyramid;
+
+import java.net.URISyntaxException;
+import java.nio.file.Path;
+
+import org.scijava.Context;
+
+import sc.fiji.ome.zarr.pyramid.backend.n5.N5PyramidBackend;
+import sc.fiji.ome.zarr.util.ZarrTestUtils;
+
+class N5BackedPyramidal5DImageDataTest implements Pyramidal5DImageDataTestBase
+{
+	@Override
+	@SuppressWarnings( { "rawtypes", "unchecked" } )
+	public Pyramidal5DImageDataImpl< ?, ? > load( final String resource, final Context context, final Integer preferredWidth )
+			throws URISyntaxException
+	{
+		Path path = ZarrTestUtils.resourcePath( resource );
+		return new Pyramidal5DImageDataImpl<>( context, new N5PyramidBackend( path.toString(), preferredWidth ) );
+	}
+}