Matchers.java 文件源码

@Factory
public static Matcher<Iterable<?>> isEmpty() {
    return new BaseMatcher<Iterable<?>>() {
        public boolean matches(Object o) {
            Iterable<?> iterable = (Iterable<?>) o;
            return iterable != null && !iterable.iterator().hasNext();
        }

        public void describeTo(Description description) {
            description.appendText("an empty Iterable");
        }
    };
}