public static void Prepend1()
{
IEnumerable <int> source = new ThrowingEnumerable <int>();
var q = Assert.DoesNotThrow(() => source.Prepend(1));
// We bypass the first iteration (we just prepended 1 to the sequence,
// iterating won't throw immediately).
Assert.ThrowsAfter(q, 1);
}
public static void Generate01()
{
Func <int, int> generator = _ => throw new InvalidOperationException();
Func <int, bool> predicate = _ => throw new InvalidOperationException();
var q1 = Assert.DoesNotThrow(() => Sequence.Generate(0, generator));
Assert.ThrowsAfter(q1, 1);
var q2 = Assert.DoesNotThrow(() => Sequence.Generate(0, generator, _ => true));
Assert.ThrowsAfter(q2, 1);
var q3 = Assert.DoesNotThrow(() => Sequence.Generate(0, i => i + 1, predicate));
Assert.ThrowsOnNext(q3);
}
public static void Unfold1b()
{
Func <int, int> generator = _ => throw new InvalidOperationException();
Func <int, int> resultSelector = _ => throw new InvalidOperationException();
Func <int, bool> predicate = _ => throw new InvalidOperationException();
var q1 = Assert.DoesNotThrow(() => Sequence.Unfold(0, generator, i => i + 1));
Assert.ThrowsAfter(q1, 1);
var q2 = Assert.DoesNotThrow(() => Sequence.Unfold(0, i => i + 1, resultSelector));
Assert.ThrowsOnNext(q2);
var q3 = Assert.DoesNotThrow(() => Sequence.Unfold(0, generator, i => i + 1, _ => true));
Assert.ThrowsAfter(q3, 1);
var q4 = Assert.DoesNotThrow(() => Sequence.Unfold(0, i => i + 1, resultSelector, _ => true));
Assert.ThrowsOnNext(q4);
var q5 = Assert.DoesNotThrow(() => Sequence.Unfold(0, i => i + 1, i => i + 1, predicate));
Assert.ThrowsOnNext(q5);
}
