FoodDbDao_test error

[nadar71]

Running the test, it ends with :
java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.Object java.util.List.get(int)' on a null object reference

as if the foodList from LiveData<List> foodListLive is null.
foodListLive is null as well if I comment all what is after : Observer<List> observer = res -> assertEquals(1,res.size());

The pb happens both if I use this for creating db :
foodDatabase = ((SingletonProvider) SingletonProvider.Companion.getsContext()).getDatabase();

or this :
foodDatabase = Room.inMemoryDatabaseBuilder(
InstrumentationRegistry.getInstrumentation().getContext(),
FoodDatabase.class)
//.addMigrations(FoodDatabase.Companion.MIGRATION_1_2)
.build();

with only differences that in the first data are inserted in the physical db on device, so they are in, but no list is recovered.

Maybe depending of not using androidx ?