OptionalExample.java 文件源码

@Test
public void present_instances () {

    List<Optional<PullRequest>> pullRequests = Lists.newArrayList();
    pullRequests.add(getPullRequestUsingGuavaOptional());
    pullRequests.add(Optional.of(new PullRequest("Graham", "a->b summary",  "please merge")));
    pullRequests.add(getPullRequestUsingGuavaOptional());
    pullRequests.add(Optional.of(new PullRequest("Jesse", "c->d summary",  "check code")));

    Iterable<PullRequest> presentInstances = Optional.presentInstances(pullRequests);

    assertThat(presentInstances, IsIterableWithSize.<PullRequest>iterableWithSize(2));
}