Elements of Android Room Version 0.4 by Mark L. Murphy

Author:Mark L. Murphy
Language: eng
Format: mobi, epub
Publisher: CommonsWare
Published: 2021-01-31T16:02:40+00:00

Testing Migrations

It would be nice if your migrations worked. Users, in particular, appreciate working code… or, perhaps more correctly, they get rather angry with non-working code.

Hence, you might want to test the migrations.

This gets a bit tricky, though. The code-generated Room classes are expecting the latest-and-greatest schema version, so you cannot use your DAO for testing older schemas. Besides, RoomDatabase.Builder wants to set up your database with that latest-and-greatest schema automatically.

Fortunately, Room ships with some testing code to help you test your schemas in isolation… though you bypass most of Room to do that.

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