IssueTracker

Component used:fragment-testing
Version used:1.1.0-alpha03
Devices/Android versions reproduced on:


as per https://stackoverflow.com/questions/54012481/crash-after-updating-to-fragment-testing-library-v1-1-0-alpha03?noredirect=1#comment94863696_54012481

After updating to androidx.fragment:fragment-testing v1.0-alpha03 we're now getting following crash at end of test.

```
java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.Collection java.util.concurrent.ConcurrentHashMap.values()' on a null object reference
at androidx.lifecycle.ViewModel.clear(ViewModel.java:125)
at androidx.lifecycle.ViewModelStore.clear(ViewModelStore.java:62)
```

Importantly this is test where we're mocking instance of ViewModel being used and issues seems to be related to associated changes to lifecycle-viewmodel v2.1.0-alpha01 which we now have a transitive dependency to. Specifically crash is occurring in following method because mBagOfTags is null

```
final void clear() {
    mCleared = true;
    for (Object value: mBagOfTags.values()) {
        // see comment for the similar call in setTagIfAbsent
        closeWithRuntimeException(value);
    }
    onCleared();
}
```

repo steps:

clone https://github.com/joreilly/galway-bus-android
checkout `fragment_test_issue ` branch
run `RouteListFragmentTest`