I'm trying to test my worker class, but when I attempt to create the worker instance, it gives me this error
java.lang.IllegalStateException: Could not create an instance of ListenableWorker
This is the code of my Worker class
@HiltWorker
class MyWorker @AssistedInject constructor(
@Assisted private val context: Context,
@Assisted parameters: WorkerParameters,
private val repository: IMyRepository // this is an interface
) : CoroutineWorker(context, parameters) {
////
}
I'm trying to test my worker with this code:
@HiltAndroidTest
class WorkerTest {
@get:Rule
val hiltRule = HiltAndroidRule(this)
private lateinit var appContext: Context
@Before
fun setUp() {
appContext = ApplicationProvider.getApplicationContext()
hiltRule.inject()
}
@Test
fun testMyWorker() {
val worker = TestListenableWorkerBuilder<DecryptionWorker>(
context = appContext,
).build() // Error on this line
}
}
And this code is my test repository implementation:
@Singleton
class TestMyRepositoryImpl @Inject constructor(): IMyRepository {
////
}
I'm not sure, but I think this is the correct way to bind my test repository and replace my actual CoreModule
@Module
@TestInstallIn(
components = [SingletonComponent::class],
replaces = [CoreModule::class]
)
abstract class TestCoreModule {
@Binds
abstract fun provideMyRepository(myRepositoryImpl: TestMyRepositoryImpl): IMyRepository
}
I learned from this article that you can create a worker factory and use it to create an instance of your worker. With that said, here's my current implementation.
class TestWorkerFactory(
private val myRepository: IMyRepository
) : WorkerFactory() {
override fun createWorker(
appContext: Context,
workerClassName: String,
workerParameters: WorkerParameters
): ListenableWorker? {
return when (workerClassName) {
MyWorker::class.java.name -> MyWorker(
appContext,
workerParameters,
myRepository
)
else -> null
}
}
}
Since I'm still using the TestCoreModule
, this is my current test code:
@HiltAndroidTest
class WorkerTest {
@get:Rule
val hiltRule = HiltAndroidRule(this)
private lateinit var appContext: Context
@Inject
lateinit var myRepository: IMyRepository
@Before
fun setUp() {
appContext = ApplicationProvider.getApplicationContext()
hiltRule.inject()
}
@Test
fun testMyWorker() {
val worker = TestListenableWorkerBuilder<MyWorker>(
context = appContext
).setWorkerFactory(
TestWorkerFactory(myRepository)
).build()
// The rest of my test code
}
}
Note: I'm open to feedback and learning from others, so if you happen to notice any flaws in my current implementation, please feel free to share your insights. I'm continuously learning.