2.x: BaseObserver.assertNothing

[arturdryomov]

Just want to piggyback on #5555.

assertOnlyValues became very useful in our team, basically freeing us from writing multiple tests to check that the stream emitted values and, at the same time, did not produce errors or completion.

assertNothing should do pretty much the same thing as assertOnlyValues being an alias to other checks.

public final U assertNothing() {
    return assertSubscribed()
        .assertNoValues
        .assertNoErrors()
        .assertNotComplete();
}

[vanniktech]

Can't you use assertResult()?

[arturdryomov]

Not exactly, we want to check that nothing was emitted, no error and no complete were passed as well.

[vanniktech]

Ah okay got it. Didn't see the assertNotComplete. I like the idea. I'm +1 for the operator.

[akarnokd]

It is called assertEmpty.

[arturdryomov]

Great, thanks! I guess we learn something every day :-)