public async Task SkipLastWithNullableDecimalSourceWithCountIsEquivalentToSkipLastTest()
        {
            // Arrange

            // Arrange 'queryAdapter' parameter
            var queryAdapter = await GetQueryAdapterAsync(DisallowAll);

            // Arrange 'source' parameter
            var source = GetQueryable <decimal?>();

            // Arrange 'asyncSource' parameter
            var asyncSource = queryAdapter.GetAsyncQueryable <decimal?>();

            // Arrange 'count' parameter
            var count = 5;

            // Arrange 'expectedResult' parameter
            var expectedResult =
                EnumerableExtension
                .SkipLast <decimal?>(source, count);

            // Act
            var result = await AsyncQueryable.SkipLast <decimal?>(asyncSource, count).ToListAsync().ConfigureAwait(false);

            // Assert
            Assert.Equal(expectedResult, result);
        }
        public async Task SkipLastWithDoubleSourceWithCountNullSourceThrowsArgumentNullExceptionTest()
        {
            // Arrange

            // Arrange 'queryAdapter' parameter
            var queryAdapter = await GetQueryAdapterAsync(DisallowAll);

            // Arrange 'asyncSource' parameter
            IAsyncQueryable <double> asyncSource = null !;

            // Arrange 'count' parameter
            var count = 5;

            // Act
            // -

            // Assert
            await Assert.ThrowsAsync <ArgumentNullException>(async() =>
            {
                await AsyncQueryable.SkipLast <double>(asyncSource, count).ToListAsync().ConfigureAwait(false);
            });
        }