Rxjava: onErrorResumeNext onErrorReturn not called when subscribeOn any scheduler under unit test environment using 2.1

[exloong]

onErrorResumeNext onErrorReturn not called when subscribeOn any schedule under unit test environment using 2.1, but they work in the actual app environment and also works on RxJava1.

What I am expecting is that the first test case should pass. Do I have wrong expectation or do somthing wrong?

Version for rxjava: 'io.reactivex.rxjava2:rxjava:2.1.0'
Version for junit: "junit:junit:4.12'

This fails

    @Test
    public void test() {
        Observable.error(() -> new RuntimeException())
                .subscribeOn(Schedulers.newThread())
                .onErrorResumeNext(Observable.just("1"))
                .test()
                .assertValueAt(0, v -> "1".equals(v));
    }

This passes
```
@Test
public void test() {
Observable.error(new RuntimeException())
.subscribeOn(Schedulers.newThread())
.onErrorResumeNext(Observable.just("1"))
.test()
.assertValueAt(0, v -> "1".equals(v));
}

**This passes**

@Test
public void test() {
    Observable.error(() -> new RuntimeException())
            .onErrorResumeNext(Observable.just("1"))
            .test()
            .assertValueAt(0, v -> "1".equals(v));
}

**trace for failed test case**

java.lang.AssertionError: No values (latch = 1, values = 0, errors = 0, completions = 0)

at io.reactivex.observers.BaseTestConsumer.fail(BaseTestConsumer.java:162)
at io.reactivex.observers.BaseTestConsumer.assertValueAt(BaseTestConsumer.java:417)
   /** hide one line of trace because of containing company information, just where the assertion failes in test class **/
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:117)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:262)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:84)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

Process finished with exit code 255
```

[akarnokd]

You have to wait for the sequence to finish before asserting properties when using operators that run on schedulers:

.test()
.awaitDone(5, TimeUnit.SECONDS)
.assertResult(1);

See the other await methods.

[exloong]

Thanks, @akarnokd , it works for me, actually, I will choose await() in my case. And this has been already in WiKi page. Sorry for not reading it carefully, I paste the link here for anyone who may be interested.

[akarnokd]

Looks like this question has been answered. If you have further input on the issue, don't hesitate to reopen this issue or post a new one.

[GaldinoJr]

Nice @akarnokd !!
Works perfectly.
Thanks a lot!