@Test
public void testIsGapSymbol() {

    assertFalse(isGapSymbol(DNATools.a()));
    assertFalse(isGapSymbol(DNATools.c()));
    assertFalse(isGapSymbol(DNATools.t()));
    assertFalse(isGapSymbol(DNATools.g()));
    assertFalse(isGapSymbol(DNATools.n()));
    assertTrue(isGapSymbol(AlphabetManager.getGapSymbol()));
    assertTrue(isGapSymbol(DNATools.getDNA().getGapSymbol()));
}