public void Eagerly_Validates_Source()
{
var target = new ThrowingAsyncEnumerable <int>();
Assert.Throws <ArgumentNullException>(() =>
{
var iter = AsyncEnumerable.Cast <int, object>((IAsyncEnumerable <int>)null);
});
}
public async Task Awaiting_Causes_Iteration()
{
var target = new ThrowingAsyncEnumerable <int>();
await Assert.ThrowsAsync <NotImplementedException>(async() =>
{
await using (var items = AsyncEnumerable.Cast <int, object>(target).GetAsyncEnumerator())
{
await items.MoveNextAsync();
}
});
}
