public void TestAddIgnoreNullSuccess()
 {
     Assert.True(CollectionUtils.AddIgnoreNull(StringList, "SS"));
     Assert.False(CollectionUtils.AddIgnoreNull(StringList, null));
     Assert.True(StringList.Contains("SS"));
     Assert.True(!StringList.Contains(null));
 }
 public void TestAddgnoreNullByNullMainCollThrowsException()
 {
     Assert.Throws <NullReferenceException>(() => CollectionUtils.AddIgnoreNull(null, "SS"));
 }