### Question:
AmsreProductReaderPlugIn implements ProductReaderPlugIn { @Override public BeamFileFilter getProductFileFilter() { return new BeamFileFilter(FORMAT_NAME, getDefaultFileExtensions(), getDescription(null)); }  @Override DecodeQualification getDecodeQualification(Object input); @Override Class[] getInputTypes(); @Override ProductReader createReaderInstance(); @Override String[] getFormatNames(); @Override String[] getDefaultFileExtensions(); @Override String getDescription(Locale locale); @Override BeamFileFilter getProductFileFilter(); static final String FORMAT_NAME; }### Answer:
@Test public void testProductFileFilter() { final BeamFileFilter fileFilter = plugIn.getProductFileFilter(); assertNotNull(fileFilter); assertEquals(".hdf", fileFilter.getDefaultExtension()); }