[英]Unit test ViewModel with MeditorLiveData and coroutines
I created Unit test for my viewModel. 我为viewModel创建了单元测试。 This ViewModel just call loadAllStructures when created and call loadSubmissionBy when currentFilter or query changes (throught mediator)
此ViewModel在创建时仅调用loadAllStructures,在currentFilter或查询发生更改时调用loadSubmissionBy(通过中介)
But when I instanciate my ViewModel in before(), the test crash with this a nullPointerException at "addsource(query)" 但是当我在before()中实例化ViewModel时,测试在“ addsource(query)”处使用nullPointerException崩溃
If I put this line in comment, I got the same error but at "submissionRepository.loadSubmissionBy(...)" 如果我在注释中添加此行,则会出现相同的错误,但在“ submissionRepository.loadSubmissionBy(...)”处
"currentFilter" and "query" can be null and this case is handled by repo/dao by @Query (I'm using room) “ currentFilter”和“ query”可以为null,这种情况由@Query由repo / dao处理(我正在使用room)
What am I missing ? 我想念什么?
ViewModel 视图模型
private val currentFilter: LiveData<SubmissionFilter> = structureFilterRepository.selectedFilter
var mQuery = MutableLiveData("")
private val query: LiveData<String> = mQuery
private val mediator = MediatorLiveData<List<Submission>>().apply {
addSource(currentFilter) {
populate()
spyStructures()
}
addSource(query) { populate() }
}
val submissionModels: LiveData<List<Submission>>
get() = mediator
fun init() {
viewModelScope.launch {
structures.value = structureRepository.loadAllStructures().map { it.structureId to it }.toMap()
}
populate()
}
private fun populate() {
val result = submissionRepository.loadSubmissionBy(currentFilter.value, query.value?.trim())
mediator.addSource(result) { mediator.value = it }
}
ViewModelTest ViewModelTest
@ExperimentalCoroutinesApi
@RunWith(RobolectricTestRunner::class)
class SubmissionViewModelTest: KoinTest {
@Mock
private lateinit var structureRepository: StructureRepository
@Mock
private lateinit var structureFilterRepository: SubmissionFilterRepository
@Mock
private lateinit var submissionRepository: SubmissionRepository
private val fakeStructures = createFakeStructure(5)
@get:Rule
val rule = InstantTaskExecutorRule()
@Before
fun before() {
MockitoAnnotations.initMocks(this)
parentViewModelTest = SubmissionParentViewModel(structureRepository, structureFilterRepository, submissionRepository)
runBlocking { whenever(structureRepository.loadAllStructures()).thenReturn(fakeStructures) }
runBlocking { parentViewModelTest.init() }
}
@Test
fun empty() {
}
}
Stacktrace 堆栈跟踪
java.lang.NullPointerException
at androidx.arch.core.internal.SafeIterableMap.get(SafeIterableMap.java:48)
at androidx.arch.core.internal.SafeIterableMap.putIfAbsent(SafeIterableMap.java:66)
at androidx.lifecycle.MediatorLiveData.addSource(MediatorLiveData.java:87)
at com.daxium.air.base.submissions.SubmissionParentViewModel.<init>(SubmissionParentViewModel.kt:33)
at com.daxium.air.app.submissions.SubmissionViewModelTest.before(SubmissionViewModelTest.kt:89)
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.RunBefores.evaluate(RunBefores.java:24)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
at org.robolectric.internal.SandboxTestRunner$2.evaluate(SandboxTestRunner.java:228)
at org.robolectric.internal.SandboxTestRunner.runChild(SandboxTestRunner.java:110)
at org.robolectric.internal.SandboxTestRunner.runChild(SandboxTestRunner.java:37)
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.robolectric.internal.SandboxTestRunner$1.evaluate(SandboxTestRunner.java:64)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$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)
The empty test should pass and the init of ViewModel should work like it's work in production 空测试应该通过并且ViewModel的init应该像在生产中一样工作
I will explain in currentFilter
我会在
currentFilter
解释
private val currentFilter: LiveData<SubmissionFilter> = structureFilterRepository.selectedFilter
. 。
addSource(currentFilter) {
populate()
spyStructures()
}
your structureFilterRepository
is mocked , it means all fields inside are null
and all functions will return null
您的
structureFilterRepository
是模拟的,这意味着其中的所有字段均为null
并且所有函数都将返回null
how to solve it 如何解决
@Before
fun before() {
MockitoAnnotations.initMocks(this)
//define what will return your mocked objects
whenever(structureFilterRepository.selectedFilter).thenReturn(/*return what you need to use */)
parentViewModelTest = SubmissionParentViewModel(structureRepository, structureFilterRepository, submissionRepository)
runBlocking { whenever(structureRepository.loadAllStructures()).thenReturn(fakeStructures) }
runBlocking { parentViewModelTest.init() }
}
all functions or properties inside mocked
objects which are used inside parentViewModelTest
s properties
, init
block and constructor
must be defined before this line 内的所有功能或性质
mocked
其内部使用的对象parentViewModelTest
小号properties
, init
块和constructor
必须在该行之前被定义
parentViewModelTest = SubmissionParentViewModel(structureRepository, structureFilterRepository, submissionRepository)
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