// Check that the final Coverage Bands are 2
Assert.assertEquals(2, mosaic.getNumSampleDimensions());
// Check that the final GridCoverage BoundingBox is equal to the union of the separate coverages bounding box
Envelope2D expected = coverage3.getEnvelope2D();
expected.include(coverage4.getEnvelope2D());
// Mosaic Envelope
Envelope2D actual = mosaic.getEnvelope2D();
// Check the same Bounding Box
assertEqualBBOX(expected, actual);