ALinq.Tests.ASyncEnumerableDefaultIfEmptyTests.DefaultIfEmptyShouldReturnDefaultValueOnEmptySequence C# (CSharp) 메소드

        public async Task DefaultIfEmptyShouldReturnDefaultValueOnEmptySequence()
        {
            var sequence1 = await AsyncEnumerable.Empty<int>().DefaultIfEmpty().ToList();

            CollectionAssert.AreEqual(new [] { 0 },sequence1.ToList());

            var sequence2 = await AsyncEnumerable.Range(0, 2).DefaultIfEmpty().ToList();

            CollectionAssert.AreEqual(new [] { 0,1},sequence2.ToList());
        }
    }