how to mock test Kotlin Spring boot 2 application - spring-boot

Question

I am trying to test a spring boot application written completely in kotlin.
I am trying to test the Service layer mocking the repository object. Code is as bellow
#RunWith(MockitoJUnitRunner::class)
class TaskServiceTest {
#Mock
lateinit var taskRepository: TaskRepository
#InjectMocks
lateinit var taskService: TaskService
#Test
fun createNewTaskFailTest() {
val taskRequest = TaskRequest("fullName", "94123456789", "", "")
val newTask = Task(
id = null,
status = PENDING)
val savedTask = newTask.copy(id = 1L)
given(taskRepository.save(newTask)).willReturn(savedTask)
val createdTask = taskService.createTask(taskRequest)
Assert.assertEquals(createdTask.status, PENDING)
}
}
when I run this code I get the following error
java.lang.IllegalStateException: savedTask must not be null
at com.hsenid.servicestatusinquiry.service.TaskService.createTask(TaskService.kt:46)
at com.hsenid.servicestatusinquiry.service.TaskServiceTest.createNewTaskFailTest(TaskServiceTest.kt:41)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.mockito.internal.runners.DefaultInternalRunner$1.run(DefaultInternalRunner.java:79)
at org.mockito.internal.runners.DefaultInternalRunner.run(DefaultInternalRunner.java:85)
at org.mockito.internal.runners.StrictRunner.run(StrictRunner.java:39)
at org.mockito.junit.MockitoJUnitRunner.run(MockitoJUnitRunner.java:163)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
[MockitoHint] TaskServiceTest.createNewTaskFailTest (see javadoc for MockitoHint):
[MockitoHint] 1. Unused... -> at com.hsenid.servicestatusinquiry.service.TaskServiceTest.createNewTaskFailTest(TaskServiceTest.kt:40)
[MockitoHint] ...args ok? -> at com.hsenid.servicestatusinquiry.service.TaskService.createTask(TaskService.kt:45)
create task is working fine when I call it from controller with http call
bellow is create task code sample
fun createTask(taskRequest: TaskRequest): Task {
val newTask = Task(
id = null,
status = PENDING)
val savedTask = repository.save(newTask)
return savedTask
}
how to fix this?

Answer 1

The following code worked for me
given(taskRepository.save(any(Task.class))).willReturn(savedTask)

Answer 2

I did this:
First I annotate my class with:
#ExtendWith(MockitoExtension::class)
class TaskServiceTest
Then:
private fun <T> anyObject(): T {
Mockito.anyObject<T>()
return uninitialized()
}
Mockito.`when`<Any>(taskRepository.save(anyObject()))
.thenReturn(validTask())
Worked for me.