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56 lines
1.9 KiB
Markdown
56 lines
1.9 KiB
Markdown
<!--- TOC -->
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* [Testing database migration](#testing-database-migration)
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* [Creating a reference database](#creating-a-reference-database)
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* [Testing](#testing)
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<!--- END -->
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## Testing database migration
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### Creating a reference database
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Databases are encrypted, the key to decrypt is needed to setup the test.
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A special build property must be enabled to extract it.
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Set `vector.debugPrivateData=true` in `~/.gradle/gradle.properties` (to avoid committing by mistake)
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Launch the app in your emulator, login and use the app to fill up the database.
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Save the key for the tested database
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```
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RealmKeysUtils W Database key for alias `session_db_fe9f212a611ccf6dea1141777065ed0a`: 935a6dfa0b0fc5cce1414194ed190....
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RealmKeysUtils W Database key for alias `crypto_module_fe9f212a611ccf6dea1141777065ed0a`: 7b9a21a8a311e85d75b069a343.....
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```
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Use the [Device File Explorer](https://developer.android.com/studio/debug/device-file-explorer) to extrat the database file from the emulator.
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Go to `data/data/im.vector.app.debug/files/<hash>/`
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Pick the database you want to test (name can be found in SessionRealmConfigurationFactory):
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- crypto_store.realm for crypto
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- disk_store.realm for session
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- etc...
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Download the file on your disk
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### Testing
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Copy the file in `src/AndroidTest/assets`
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see `CryptoSanityMigrationTest` or `RealmSessionStoreMigration43Test` for sample tests.
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There are already some databases in the assets folder.
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The existing test will properly detect schema changes, and fail with such errors if a migration is missing:
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```
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io.realm.exceptions.RealmMigrationNeededException: Migration is required due to the following errors:
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- Property 'CryptoMetadataEntity.foo' has been added.
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```
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If you want to test properly more complex database migration (dynamic transforms) ensure that the database contains
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the entity you want to migrate.
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You can explore the database with [realm studio](https://www.mongodb.com/docs/realm/studio/) if needed.
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