Question

尝试使用MigrationTestHelper类和Robolectric测试房间迁移。我们希望将其作为JUnit测试，因为我们的CI环境无法启动仿真器。 （请为模拟器提供CI修复程序，请提供答案，CI不在我的控制范围内。）我唯一遇到的问题是测试失败，因为它找不到架构。我的build.gradle已经包含了它

android {
    sourceSets {
        test.assets.srcDirs += files("$projectDir/schemas".toString())
        androidTest.assets.srcDirs += files("$projectDir/schemas".toString())

    test {
        java.srcDirs += "$projectDir/src/sharedTest/java"
    }

    testOptions {
        unitTests {
            includeAndroidResources = true
        }
        unitTests.all {
            systemProperty 'robolectric.enabledSdks', '21'
        }
    }
}
dependencies {
   // has all the proper dependencies from mockito adn robolectric to kotlin and junit.
}

这是测试代码，但是再次调用数据库创建时找不到其大部分模式。 json文件也位于架构目录中

@RunWith(RobolectricTestRunner::class)
class Migration19To20Test {
    private val migration = MyDatabase.MIGRATION_19_20
    private val fromVersion = 19
    private val toVersion = 20

    @get:Rule
    val helper: MigrationTestHelper = MigrationTestHelper(
            InstrumentationRegistry.getInstrumentation(),
            MyDatabase::class.java.canonicalName,
            FrameworkSQLiteOpenHelperFactory())

    private val testDatabaseName = "migration-test"

    @Test
    fun insertsFirmwareVersionFullColumn() {
        givenADatabase()

        val validateDroppedTables = true
        val db = helper.runMigrationsAndValidate(
                testDatabaseName,
                toVersion,
                validateDroppedTables,
                migration)

        db.query("select * from ${DatabaseConstants.Table.People}").use { cursor ->
            cursor.moveToFirst()
            assertTrue("table should contain the ${DatabaseConstants.Column.People.NAME_FULL} column as it should have been added",
                    cursor.columnNames.contains(DatabaseConstants.Column.People.NAME_FULL))
        }
    }

    private fun givenADatabase() {
        // Test fails here
        helper.createDatabase(testDatabaseName, fromVersion)
    }
}

Answer 1

我通过将MigrationTestHelper复制到测试源代码并修改了loadSchema方法使其看起来像这样来解决了

    private SchemaBundle loadSchema(Context context, int version) throws IOException {
//        InputStream input = context.getAssets().open(mAssetsFolder + "/" + version + ".json");
        InputStream input = new FileInputStream("./schemas/" + mAssetsFolder + "/" + version + ".json");
        return SchemaBundle.deserialize(input);
    }

schemas目录是在build.gradle中配置的

android {
    defaultConfig {
        javaCompileOptions {
            annotationProcessorOptions {
                arguments = [
                        "room.schemaLocation"  : "$projectDir/schemas".toString(),
                        "room.incremental"     : "true",
                        "room.expandProjection": "true"]
            }
        }
    }
}

您可以看到，原因是该类在assets目录中寻找迁移，因为Google假定您将在设备上运行这些迁移。在这种情况下，您必须将它们包含在android资产中。

使用Robolectric，它只是从目录中读取内容并将其放入流中。

测试室作为JUnit测试而不是AndroidTest

1 个答案: