tancesOfType( IEnumerable collection,
          Type expectedType );
CollectionAssert.AllItemsAreInstancesOfType( IEnumerable collection,
          Type expectedType, string message );
CollectionAssert.AllItemsAreInstancesOfType( IEnumerable collection,
          Type expectedType, string message, params object[] args );

CollectionAssert.AllItemsAreNotNull( IEnumerable collection );
CollectionAssert.AllItemsAreNotNull( IEnumerable collection,
          string message );
CollectionAssert.AllItemsAreNotNull(