@Test
public void testGetCodec() {

  checkCodec(GzipCodec.class, "gzip");
  checkCodec(GzipCodec.class, "Gzip");
  checkCodec(GzipCodec.class, "gzipcodec");
  checkCodec(GzipCodec.class, "GzipCodec");
  checkCodec(GzipCodec.class, "org.apache.hadoop.io.compress.GzipCodec");
}