Database migrations test

app/build.gradle

@@ -16,6 +16,7 @@ android {
 		versionCode 367
 		versionName '1.1.2'
 		generatedDensities = []
+		testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
 
 		kapt {
 			arguments {
@@ -41,6 +42,9 @@ android {
 	buildFeatures {
 		viewBinding true
 	}
+	sourceSets {
+		androidTest.assets.srcDirs += files("$projectDir/schemas".toString())
+	}
 	lintOptions {
 		disable 'MissingTranslation'
 		abortOnError false
@@ -106,4 +110,11 @@ dependencies {
 	testImplementation 'org.json:json:20210307'
 	testImplementation 'org.jetbrains.kotlinx:kotlinx-coroutines-test:1.5.1'
 	testImplementation 'io.insert-koin:koin-test-junit4:3.1.2'
+
+	androidTestImplementation 'androidx.test:runner:1.4.0'
+	androidTestImplementation 'androidx.test:rules:1.4.0'
+	androidTestImplementation 'androidx.test:core-ktx:1.4.0'
+	androidTestImplementation 'androidx.test.ext:junit-ktx:1.1.3'
+	androidTestImplementation 'androidx.room:room-testing:2.3.0'
+	androidTestImplementation 'com.google.truth:truth:1.1.3'
 }

app/src/androidTest/java/org/koitharu/kotatsu/core/db/MangaDatabaseTest.kt

@@ -0,0 +1,55 @@
+package org.koitharu.kotatsu.core.db
+
+import androidx.room.testing.MigrationTestHelper
+import androidx.sqlite.db.framework.FrameworkSQLiteOpenHelperFactory
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.platform.app.InstrumentationRegistry
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.koitharu.kotatsu.core.db.migrations.*
+import java.io.IOException
+
+@RunWith(AndroidJUnit4::class)
+class MangaDatabaseTest {
+
+	@get:Rule
+	val helper: MigrationTestHelper = MigrationTestHelper(
+		InstrumentationRegistry.getInstrumentation(),
+		MangaDatabase::class.java.canonicalName,
+		FrameworkSQLiteOpenHelperFactory()
+	)
+
+	@Test
+	@Throws(IOException::class)
+	fun migrateAll() {
+		helper.createDatabase(TEST_DB, 1).apply {
+			// TODO execSQL("")
+			close()
+		}
+		for (migration in migrations) {
+			helper.runMigrationsAndValidate(
+				TEST_DB,
+				migration.endVersion,
+				true,
+				migration
+			)
+		}
+	}
+
+
+	private companion object {
+
+		const val TEST_DB = "test-db"
+
+		val migrations = arrayOf(
+			Migration1To2(),
+			Migration2To3(),
+			Migration3To4(),
+			Migration4To5(),
+			Migration5To6(),
+			Migration6To7(),
+			Migration7To8(),
+		)
+	}
+}