public void TestSkipNulls()
{
var skipNulls = J.SkipNulls();
CheckNoOutput(skipNulls, ITERABLE_);
CheckNoOutput(skipNulls, ITERABLE_NULL);
CheckNoOutput(skipNulls, ITERABLE_NULL_NULL);
CheckNoOutput(skipNulls, ITERABLE_FOUR_NULLS);
CheckResult(skipNulls, ITERABLE_1, "1");
CheckResult(skipNulls, ITERABLE_12, "1-2");
CheckResult(skipNulls, ITERABLE_123, "1-2-3");
CheckResult(skipNulls, ITERABLE_NULL_1, "1");
CheckResult(skipNulls, ITERABLE_1_NULL, "1");
CheckResult(skipNulls, ITERABLE_1_NULL_2, "1-2");
}