### Question:
AmsreProductReaderPlugIn implements ProductReaderPlugIn { @Override public String[] getDefaultFileExtensions() { return new String[]{".hdf"}; }  @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 testGetDefaultFileExtensions(){ final String[] extensions = plugIn.getDefaultFileExtensions(); assertEquals(1, extensions.length); assertEquals(".hdf", extensions[0]); }