This is my main function
object Service {
fun getConfigMappings(client: RedissonClient, request: GetRequest): IndataType {
****
return obj
}
}
I calling it in my main class, and everything works good, I can get the response.
#Autowired
lateinit var client: RedissonClient
val indataObj = Service.getConfigMappings(client, request)
When I want to write a test for it, I got error "kotlin.UninitializedPropertyAccessException: lateinit property client has not been initialized", can anyone help me with that?
"
class ServiceTest {
#Autowired
lateinit var client: RedissonClient
#Test
fun `test1`() {
val request = GetRequest {
***
}
val indataObj = Service.getConfigMappings(client, request)
}
}
kotlin.UninitializedPropertyAccessException: lateinit property has not been initialized is occured because there is no configuration for AutoWired.
If you want to use AutoWired in the unit test, it needs annotation for configuration.
#RunWith(SpringJUnit4ClassRunner.class)
#ContextConfiguration(locations="classpath:config/springbeans.xml")
public class BeanSpringTest {
if you want to use #Autowired, there must have a #Bean somewhere
Related
After searching around the net for few days, couldn't really find the resources I need for my use case as many of it are implemented in Java.
I have a service class that is calling external api, and I am trying to write unit tests on it with MockWebServer
#Service
class ApiService {
#Autowired
private lateinit var webClient: WebClient
fun getApiResult(name: String): ResultDto? {
return try {
webClient
.get()
.uri("https://www.example.com/")
.retrieve()
.bodyToMono(Result::class)
.block()
catch {
null
}
}
}
#ExtendWith(MockitoExtension::class)
#MockitoSettings(strictname = Strictness.LENIENT)
#TestInstance(TestInstance.Lifecycle.PER_CLASS)
class ApiServiceTest {
#Mock
private lateinit var webClient: WebClient
#InjectMocks
private lateinit var mockApiService: ApiService
private val mockName = "mockName"
private val mockDetailDto = DetailDto(name = "mockName", age = 18)
#Test
fun canGetDetails() {
mockWebServer.enqueue(
MockResponse()
.setResponse(200)
.addHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
.setBody(mockDetailDto))
)
mockApiService.getApiResult(mockName)
val request: RecordedRequest = mockWebServer.takeRequest()
// Assert statements with request
}
}
However, I am getting lateinit property webClient has not been initialised. But if I were to use #Spy instead of #Mock for the webClient in my test, it will be making actual apis calls which is not the goal of unit test. My goal would be able to check the request for some of the details such as GET and its return value. Appreciate the community's help.
By my opinion you not add some configuration, for resolve it automatically you can try make Integration Test for this. Like this
#WithMockUser//if you use spring secutity
#AutoConfigureMockMvc
#SpringBootTest(webEnvironment = RANDOM_PORT)
class MyTest {
#Autowired
private MockMvc mvc;
}
and make a test application for quickly loading environment
#SpringBootApplication
#ConfigurationPropertiesScan
#ComponentScan(lazyInit = true)//make loading is faster
public class TestApplication {
public static void main(String[] args) {
SpringApplication.run(TestApplication.class, args);
}
}
This way can load full context configuration like prod mode, of course only for called methods if you used lazyInit = true
I am having trouble using my application.properties values while testing.
Here's my code:
#Repository
class RedisSubscriptionStore(): SubscriptionStore {
#Value("\${default.package}")
lateinit var defaultPackageForFCMInstance: String }
and this works as expected. It's used in my updateSubscription method with the correct value from application.properties
The problem is in my test when I use the class the value is not instantiated and throws an error
#SpringBootTest()
#Tag("integration")
internal class RedisSubscriptionStoreIntegTest #Autowired constructor(
val objectMapper: ObjectMapper,
val redisTemplate: RedisTemplate<String, String>
) {
val sut = RedisSubscriptionStore(redisTemplate, objectMapper)
#Test
fun `return 200 when updating subscription`() {
sut.updateSubscription(updatedSub)
//Assert
val newlyUpdatedSub = getSubscription(updatedSub.peerID)
Assertions.assertEquals(updatedSub, newlyUpdatedSub)
}
but this throws the error: lateinit property defaultPackageForFCMInstance has not been initialized
even though this works with the correct value:
#SpringBootTest()
#Tag("integration")
internal class RedisSubscriptionStoreIntegTest #Autowired constructor(
val objectMapper: ObjectMapper,
val redisTemplate: RedisTemplate<String, String>
) {
#Value("\${default.package}")
lateinit var defaultPackageForFCMInstance: String
}
so why is my defaultPackageForFCMInstance not initialized when calling from my test class? It obviously have a value, I've tried printing it out in the test class before calling it from sut
Your are instantiating the RedisSubscriptionStore
So there is no way for Spring to inject value. Either also pass the value in the constructor or use injecation in the test
#Autowired
var sut: RedisSubscriptionStore
I have app.name in my application.yaml
How do i access this please, I was hoping for a simple one liner.
#Values doesn't seem to work, it only works in my restcontroller. I've created a configurationproperties and a EnableConfigurationProperties, but no one will tell me how to actually get a value from the properties.
class databaseHandler() {
#Value("\${app.url}")
private val url: String? = null
fun dave(){
print(url)
} ==Null
==
#Component
#ConfigurationProperties("app")
class appConfig(){
lateinit var url: String
}
#EnableConfigurationProperties(appConfig::class)
class dave(){
fun dave(){
print(appConfig().url)
} ==Lateinit url hasn't been initalized
}
Figured out the issue, You need to initialise your sub-class as well and also declare it as a spring component e.g.
#Service
class DatabaseHelper {
#Value("\${app.url}")
val url= ""
}
#RestController
#RequestMapping("/")
class GitHubController{
#Autowired
lateinit var databaseHelper : DatabaseHelper
#GetMapping("")
fun hello() = "hello $databaseHelper.url"
}
Assuming application.yml has the following properties:
app-url: www.demo-url.com
Add#EnableConfigurationProperties to your binding class i.e.
#Configuration
#EnableConfigurationProperties
#ConfigurationProperties
class appConfig() {
lateinit var url: String
}
#EnableConfigurationProperties this annotation is used to enable #ConfigurationProperties annotated beans in the Spring application
Please refer: https://www.baeldung.com/spring-yaml
I have working kotlin service, but when i try to write test for it i get stuck because i cant get all my services initialized no matter what...
#RunWith(SpringRunner::class)
class DataServiceTest {
#InjectMocks
private lateinit var DataService : DataService
#Mock
private lateinit var updateDataService: UpdateDataService
#Test
fun shouldUpdateCustomerEmail() {
DataService.setNewCustomerEmail("221722", ApiEmail("test#test.org"))
}
}
which calls DataService class:
#Autowired
private lateinit var updateDataService: UpdateDataService
.....
fun setNewCustomerEmail(id: String, email: ApiEmail) {
updateDataService.setNewCustomerEmail(id, email)
}
which calls UpdateDataService class:
#Service
open class UpdateDataService {
#Autowired
private lateinit var addressRepository: AddressRepository
fun setNewCustomerEmail(id: String, email: ApiEmail) {
val AddressList = getCustomerAddressList(id)
mapNewEmailToAddressList(AddressList, email)
cusAddressRepository.saveAll(AddressList)
}
fun getCustomerCusbaAddressList(id: String) : List<Address> {
return addressRepository.findAddressByCustomerId( id )
}
fun mapNewEmailToAddressList(cusbaAddressList : List<Address>, email: ApiEmail) {
AddressList.map { DataUtil.trimAddressFields( it ) }
AddressList.map { it.email = email.email }
}
}
I've tried lots of different #RunWith() properties and lots of different ways to Autowire / Mock / InjectMocks but to no avail.
Problem:
At the moment with this code. AddressRepository will be uninitialized when test gets to UpdateDataService.class in line. return addressRepository.findAddressByCustomerId( id )
Question:
How do i wire all these services in such way that services are loaded when app is running, but also test would know how to wire these services and repository ?
Using Spring Boot Test you can operate context easily
#RunWith(SpringRunner::class)
#SpringBootTest
class DataServiceTest
or provide a #TestConfiguration
Is it possible to do something like following in Kotlin?
#Autowired
internal var mongoTemplate: MongoTemplate
#Autowired
internal var solrClient: SolrClient
Recommended approach to do Dependency Injection in Spring is constructor injection:
#Component
class YourBean(
private val mongoTemplate: MongoTemplate,
private val solrClient: SolrClient
) {
// code
}
Prior to Spring 4.3 constructor should be explicitly annotated with Autowired:
#Component
class YourBean #Autowired constructor(
private val mongoTemplate: MongoTemplate,
private val solrClient: SolrClient
) {
// code
}
In rare cases, you might like to use field injection, and you can do it with the help of lateinit:
#Component
class YourBean {
#Autowired
private lateinit var mongoTemplate: MongoTemplate
#Autowired
private lateinit var solrClient: SolrClient
}
Constructor injection checks all dependencies at bean creation time and all injected fields is val, at other hand lateinit injected fields can be only var, and have little runtime overhead. And to test class with constructor, you don't need reflection.
Links:
Documentation on lateinit
Documentation on constructors
Developing Spring Boot applications with Kotlin
Yes, java annotations are supported in Kotlin mostly as in Java.
One gotcha is annotations on the primary constructor requires the explicit 'constructor' keyword:
From https://kotlinlang.org/docs/reference/annotations.html
If you need to annotate the primary constructor of a class, you need to add the constructor keyword to the constructor declaration, and add the annotations before it:
class Foo #Inject constructor(dependency: MyDependency) {
// ...
}
You can also autowire dependencies through the constructor. Remember to annotate your dependencies with #Configuration, #Component, #Service etc
import org.springframework.stereotype.Component
#Component
class Foo (private val dependency: MyDependency) {
//...
}
like that
#Component class Girl( #Autowired var outfit: Outfit)
If you want property injection but don't like lateinit var, here is my solution using property delegate:
private lateinit var ctx: ApplicationContext
#Component
private class CtxVarConfigurer : ApplicationContextAware {
override fun setApplicationContext(context: ApplicationContext) {
ctx = context
}
}
inline fun <reified T : Any> autowired(name: String? = null) = Autowired(T::class.java, name)
class Autowired<T : Any>(private val javaType: Class<T>, private val name: String?) {
private val value by lazy {
if (name == null) {
ctx.getBean(javaType)
} else {
ctx.getBean(name, javaType)
}
}
operator fun getValue(thisRef: Any?, property: KProperty<*>): T = value
}
Then you can use the much better by delegate syntax:
#Service
class MyService {
private val serviceToBeInjected: ServiceA by autowired()
private val ambiguousBean: AmbiguousService by autowired("qualifier")
}