@Test
public void testIsNormal() {

    SeverityComparator a = new SeverityComparator();
    assertTrue(a.isNormal(this.headIeChain(null)));
    assertTrue(a.isNormal(this.headIioeChain(null)));
    assertTrue(a.isNormal(this.headCbieChain(null)));
    assertTrue(a.isNormal(this.headFlieChain(null)));
    assertTrue(a.isNormal(this.headSubIeChain(null)));
    assertTrue(a.isNormal(this.headSubIioeChain(null)));
    assertTrue(a.isNormal(this.headSubTdChain(null)));
    assertTrue(a.isNormal(this.headSubTdChain(null)));
    assertTrue(a.isNormal(this.headWidChain(null)));
    assertTrue(a.isNormal(this.headWitChain(null)));
}