internal static void AssertDeferredThrowsExceptionOnIteration <T>(Func <IEnumerable <int>, IEnumerable <T> > deferredFunction)
{
ThrowingEnumerable source = new ThrowingEnumerable();
var result = deferredFunction(source);
using (var iterator = result.GetEnumerator())
{
Assert.Throws <InvalidOperationException>(() => iterator.MoveNext());
}
}
public void ExecutionIsDeferred()
{
ThrowingEnumerable.AssertDeferredThrowsExceptionOnIteration(src => src.Where(x => x > 0));
}
public void ExecutionIsDeferred()
{
ThrowingEnumerable.AssertDeferredThrowsExceptionOnIteration(src => src.Select(x => x.ToString()));
}