Issue#67 Extract MigrationTestHelper into separate module

test-util-shared-android/.gitignore

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+/build

test-util-shared-android/build.gradle

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+plugins {
+    id 'com.android.library'
+    id 'org.jetbrains.kotlin.android'
+}
+
+android {
+    compileSdk 31
+
+    defaultConfig {
+        minSdk 21
+        targetSdk 31
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles "consumer-rules.pro"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+}
+
+dependencies {
+    implementation "androidx.room:room-testing:$room_version"
+    api project(':test-util-shared-robolectric')
+
+}

test-util-shared-android/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

test-util-shared-android/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="org.fnives.test.showcase.android.testutil">
+
+</manifest>

test-util-shared-android/src/main/java/org/fnives/test/showcase/android/testutil/AndroidMigrationTestRule.kt

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+package org.fnives.test.showcase.android.testutil
+
+import android.app.Instrumentation
+import androidx.room.RoomDatabase
+import androidx.room.migration.AutoMigrationSpec
+import androidx.room.migration.Migration
+import androidx.room.testing.MigrationTestHelper
+import androidx.sqlite.db.SupportSQLiteDatabase
+import androidx.sqlite.db.SupportSQLiteOpenHelper
+import org.junit.runner.Description
+import org.junit.runners.model.Statement
+
+/**
+ * Wrapper around [MigrationTestHelper] so it can be created in SharedTests, in both Robolectric and on Device.
+ */
+class AndroidMigrationTestRule : SharedMigrationTestRule {
+
+    private val migrationTestHelper: MigrationTestHelper
+
+    constructor(
+        instrumentation: Instrumentation,
+        databaseClass: Class<out RoomDatabase>
+    ) {
+        migrationTestHelper = MigrationTestHelper(instrumentation, databaseClass)
+    }
+
+    constructor(
+        instrumentation: Instrumentation,
+        databaseClass: Class<out RoomDatabase>,
+        specs: List<AutoMigrationSpec>
+    ) {
+        migrationTestHelper = MigrationTestHelper(instrumentation, databaseClass, specs)
+    }
+
+    constructor(
+        instrumentation: Instrumentation,
+        databaseClass: Class<out RoomDatabase>,
+        specs: List<AutoMigrationSpec>,
+        openFactory: SupportSQLiteOpenHelper.Factory
+    ) {
+        migrationTestHelper = MigrationTestHelper(instrumentation, databaseClass, specs, openFactory)
+    }
+
+    override fun apply(base: Statement, description: Description): Statement =
+        migrationTestHelper.apply(base, description)
+
+    override fun closeWhenFinished(db: RoomDatabase) =
+        migrationTestHelper.closeWhenFinished(db)
+
+    override fun closeWhenFinished(db: SupportSQLiteDatabase) =
+        migrationTestHelper.closeWhenFinished(db)
+
+    override fun createDatabase(name: String, version: Int): SupportSQLiteDatabase =
+        migrationTestHelper.createDatabase(name, version)
+
+    override fun runMigrationsAndValidate(
+        name: String,
+        version: Int,
+        validateDroppedTables: Boolean,
+        vararg migrations: Migration
+    ): SupportSQLiteDatabase =
+        migrationTestHelper.runMigrationsAndValidate(
+            name,
+            version,
+            validateDroppedTables,
+            *migrations
+        )
+}