### Question:
NcAvhrrGacProductReaderPlugIn implements ProductReaderPlugIn { @Override public String[] getDefaultFileExtensions() { return new String[]{FILE_EXTENSION_NC}; }  @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 testGetFileExtension() { final String[] defaultFileExtensions = plugIn.getDefaultFileExtensions(); assertEquals(1, defaultFileExtensions.length); assertEquals(".nc", defaultFileExtensions[0]); }