public void coroutines_can_be_iterated()
{
var sut = new SomeClass();
sut.Step.Should().Be(0);
var iterator = sut.AnotherCoroutine().GetEnumerator();
iterator.MoveNext().Should().Be(true);
iterator.Current.Should().Be("foo");
sut.Step.Should().Be(1);
iterator.MoveNext().Should().Be(true);
iterator.Current.Should().Be("bar");
sut.Step.Should().Be(2);
iterator.MoveNext().Should().Be(true);
iterator.Current.Should().Be("baz");
sut.Step.Should().Be(3);
iterator.MoveNext().Should().Be(false);
}