我应该如何使用RxJava的TestScheduler
?我来自.NET背景,但RxJava中的TestScheduler
似乎与.NET rx中的测试调度程序的工作方式不同。
以下是我要测试的示例代码
Observable<Long> tick = Observable.interval(1, TimeUnit.SECONDS);
contactsRepository.find(index)
.buffer(MAX_CONTACTS_FETCH)
.zipWith(tick, new Func2<List<ContactDto>, Long, List<ContactDto>>() {
@Override
public List<ContactDto> call(List<ContactDto> contactList, Long aLong) {
return contactList;
}
}).subscribe()
我试过了:
subscribeOn(testScheduler)
testScheduler.advanceTimeBy(2, TimeUnit.SECONDS);
testScheduler.triggerActions();
没有运气。
答案 0 :(得分:22)
我举了一个如何使用TestScheduler
的例子。我认为它与.NET实现非常相似
@Test
public void should_test_the_test_schedulers() {
TestScheduler scheduler = new TestScheduler();
final List<Long> result = new ArrayList<>();
Observable.interval(1, TimeUnit.SECONDS, scheduler).take(5).subscribe(result::add);
assertTrue(result.isEmpty());
scheduler.advanceTimeBy(2, TimeUnit.SECONDS);
assertEquals(2, result.size());
scheduler.advanceTimeBy(10, TimeUnit.SECONDS);
assertEquals(5, result.size());
}
修改强>
根据您的代码:您应该将调度程序传递给Observable.interval
操作,因为这是您要控制的:
TestScheduler scheduler = new TestScheduler();
Observable<Long> tick = Observable.interval(1, TimeUnit.SECONDS, scheduler);
Subscription toBeTested = Observable.from(Arrays.asList(1, 2, 3, 4, 5))
.buffer(3)
.zipWith(tick, (i, t) -> i)
.subscribe(System.out::println);
scheduler.advanceTimeBy(2, TimeUnit.SECONDS);
答案 1 :(得分:12)
你有一些课程:
public class SomeClass {
public void someMethod() {
Observable<Long> tick = Observable.interval(1, TimeUnit.SECONDS);
contactsRepository.find(index)
.buffer(MAX_CONTACTS_FETCH)
.zipWith(tick, new Func2<List<ContactDto>, Long, List<ContactDto>>() {
@Override
public List<ContactDto> call(List<ContactDto> contactList, Long aLong) {
return contactList;
}
}).subscribe()
}
}
在文档中查找[Observable.interval][1]
,您将看到它在计算调度程序上运行,因此我们在测试中覆盖它。
public class SomeClassTest {
private TestScheduler testScheduler;
@Before
public void before() {
testScheduler = new TestScheduler();
// set calls to Schedulers.computation() to use our test scheduler
RxJavaPlugins.setComputationSchedulerHandler(ignore -> testScheduler);
}
@After
public void after() {
// reset it
RxJavaPlugins.setComputationSchedulerHandler(null);
}
@Test
public void test() {
SomeClass someInstance = new SomeClass();
someInstance.someMethod();
// advance time manually
testScheduler.advanceBy(1, TimeUnit.SECONDS);
}
此解决方案是对已接受答案的改进,因为维护了生产代码的质量,完整性和简单性。