public IEnumerable <TKey> DistinctKeysTest <TKey, TElement>(IEnumerable <Dictionary <TKey, TElement> > source)
{
IEnumerable <TKey> result = EnumerableExtension.DistinctKeys <TKey, TElement>(source);
return(result);
// TODO: add assertions to method EnumerableExtensionTest.DistinctKeysTest(IEnumerable`1<Dictionary`2<!!0,!!1>>)
}