Clones of robolectric.shadows-supportv4 supports AndroidX
robolectric-base supports androidx, but robolectric:shadows-supportv4 still doesn’t robolectric/robolectric#3985, so can not use SupportFragmentController or something else in shadows-supportv4. While waiting for official support from robolectric team, this clones of robolectric:shadows-supportv4 was made for supporting current tests using robolectric:shadows-supportv4 works without any changes in test codes.
Instead of using "org.robolectric:shadows-supportv4:$robolectric_version", change to "com.github.nimbl3:robolectric.shadows-supportv4:LATEST_VERSION". Check LATEST_VERSION from JitPack badge.
- If still meet the error like this robolectric/robolectric#3981. Try
Invalidate Cache and Restartyour Android Studio robolectric/robolectric#3981 (comment), then re-run the test.