public void Select_SourceIsArrayTakeTake()
{
var source = new[] { 1, 2, 3, 4 }.Select(i => i * 2).Take(2).Take(1);
Assert.Equal(new[] { 2 }, source);
Assert.Equal(new[] { 2 }, source.Take(10));
}
public void Select_SourceIsArray_Take()
{
var source = new[] { 1, 2, 3, 4 }.Select(i => i * 2);
Assert.Equal(new[] { 2, 4 }, source.Take(2));
Assert.Equal(new[] { 2, 4 }, source.Take(3).Take(2));
Assert.Empty(source.Take(-1));
Assert.Equal(new[] { 2, 4, 6, 8 }, source.Take(4));
Assert.Equal(new[] { 2, 4, 6, 8 }, source.Take(40));
Assert.Equal(new[] { 2 }, source.Take(1));
Assert.Equal(new[] { 4 }, source.Skip(1).Take(1));
Assert.Equal(new[] { 6 }, source.Take(3).Skip(2));
Assert.Equal(new[] { 2 }, source.Take(3).Take(1));
}
public void Select_SourceIsArray_Last()
{
var source = new[] { 1, 2, 3, 4 }.Select(i => i * 2);
Assert.Equal(8, source.Last());
Assert.Equal(8, source.LastOrDefault());
Assert.Equal(6, source.Take(3).Last());
Assert.Equal(6, source.Take(3).LastOrDefault());
var empty = new int[0].Select(i => i * 2);
Assert.Throws<InvalidOperationException>(() => empty.Last());
Assert.Equal(0, empty.LastOrDefault());
Assert.Throws<InvalidOperationException>(() => empty.Skip(1).Last());
Assert.Equal(0, empty.Skip(1).LastOrDefault());
}