public void ListSourceGetEnumerator()
{
tlog.Debug(tag, $"ListSourceGetEnumerator START");
var para = new TestEnumerable();
var testingTarget = new ListSource(para);
Assert.IsNotNull(testingTarget, "should be not null");
Assert.IsInstanceOf <ListSource>(testingTarget, "should be an instance of testing target class!");
var ret = testingTarget.GetEnumerator();
Assert.IsNotNull(ret, "The Enumerator of ListSouce should not be null.");
testingTarget.Dispose();
tlog.Debug(tag, $"ListSourceGetEnumerator END (OK)");
}