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如何在 kotlin 中测试 lambda 函数

[英]How to test lambda function in kotlin

 原文  2022-11-25 13:28:27  7   2    android/ kotlin/ android-jetpack-compose/ mockk

问题描述

我正在测试我的功能。 在函数参数内部，我使用Arrangement.Vertical传递Lambda 。 我尝试了一些代码，但它给了我错误。 我在这里添加我的功能

配对视图模型

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.setValue

class PairViewModel : BaseViewModel() {

    var isBluetoothEnabled by mutableStateOf(false)
        private set

    fun setBluetoothEnable(newValue: Boolean) {
        isBluetoothEnabled = newValue
    }

    fun isBluetoothEnable(
        bluetoothOn: () -> Arrangement.Vertical,
        bluetoothOff: () -> Arrangement.Vertical
    ): Arrangement.Vertical {
        return if (isBluetoothEnabled) {
            bluetoothOn()
        } else {
            bluetoothOff()
        }
    }
}

配对视图模型测试

class PairViewModelTest {

    @get:Rule
    val testInstantTaskExecutorRule: TestRule = TestMainCoroutineRule()

    private val subject by lazy { spyk(PairViewModel()) }
    @Before
    fun setUp() {
        MockKAnnotations.init(this, relaxed = true)
    }
    
    @Test
    fun `isBluetoothEnable - WHEN isBluetoothEnabled is false THEN should call lamda bluetoothOn`() {
        // STUBBING
        val mockedUnit = mockk<() -> Arrangement.Vertical>(relaxed = true)
        every { subject.isBluetoothEnabled } returns false

        // EXECUTION
        subject.isBluetoothEnable(mockedUnit, mockedUnit)

        // VERIFICATION
        verify {
            mockedUnit()
        }
    }
}

错误

class java.lang.Object cannot be cast to class androidx.compose.foundation.layout.Arrangement$Vertical (java.lang.Object is in module java.base of loader 'bootstrap'; androidx.compose.foundation.layout.Arrangement$Vertical is in unnamed module of loader 'app')
java.lang.ClassCastException: class java.lang.Object cannot be cast to class androidx.compose.foundation.layout.Arrangement$Vertical (java.lang.Object is in module java.base of loader 'bootstrap'; androidx.compose.foundation.layout.Arrangement$Vertical is in unnamed module of loader 'app')
    at com.abc.app.bloodpressure.PairViewModel.isBluetoothEnable(PairViewModel.kt:136)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at io.mockk.proxy.jvm.advice.MethodCall.call(MethodCall.kt:14)
    at io.mockk.proxy.jvm.advice.SelfCallEliminatorCallable.call(SelfCallEliminatorCallable.kt:14)
    at io.mockk.impl.instantiation.JvmMockFactoryHelper.handleOriginalCall(JvmMockFactoryHelper.kt:95)
    at io.mockk.impl.instantiation.JvmMockFactoryHelper.access$handleOriginalCall(JvmMockFactoryHelper.kt:18)
    at io.mockk.impl.instantiation.JvmMockFactoryHelper$mockHandler$1$invocation$$inlined$stdFunctions$lambda$1.invoke(JvmMockFactoryHelper.kt:27)
    at io.mockk.impl.stub.MockKStub$handleInvocation$originalPlusToString$1.invoke(MockKStub.kt:230)
    at io.mockk.impl.stub.SpyKStub.defaultAnswer(SpyKStub.kt:15)
    at io.mockk.impl.stub.MockKStub.answer(MockKStub.kt:42)
    at io.mockk.impl.recording.states.AnsweringState.call(AnsweringState.kt:16)
    at io.mockk.impl.recording.CommonCallRecorder.call(CommonCallRecorder.kt:53)
    at io.mockk.impl.stub.MockKStub.handleInvocation(MockKStub.kt:266)
    at io.mockk.impl.instantiation.JvmMockFactoryHelper$mockHandler$1.invocation(JvmMockFactoryHelper.kt:23)
    at io.mockk.proxy.jvm.advice.Interceptor.call(Interceptor.kt:21)
    at com.abc.app.bloodpressure.PairViewModel.isBluetoothEnable(PairViewModel.kt:135)
    at com.abc.app.bloodpressure.PairViewModelTest.isBluetoothEnable - WHEN isBluetoothEnabled is false THEN should call lamda bluetoothOn(PairViewModelTest.kt:512)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at com.abc.app.utils.TestMainCoroutineRule$apply$1.evaluate(TestMainCoroutineRule.kt:26)
    at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
    at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
    at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
    at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
    at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.runTestClass(JUnitTestClassExecutor.java:110)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:58)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:38)
    at org.gradle.api.internal.tasks.testing.junit.AbstractJUnitTestClassProcessor.processTestClass(AbstractJUnitTestClassProcessor.java:62)
    at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:51)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
    at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
    at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
    at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
    at com.sun.proxy.$Proxy5.processTestClass(Unknown Source)
    at org.gradle.api.internal.tasks.testing.worker.TestWorker$2.run(TestWorker.java:176)
    at org.gradle.api.internal.tasks.testing.worker.TestWorker.executeAndMaintainThreadName(TestWorker.java:129)
    at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:100)
    at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:60)
    at org.gradle.process.internal.worker.child.ActionExecutionWorker.execute(ActionExecutionWorker.java:56)
    at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:133)
    at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:71)
    at worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:69)
    at worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:74)

有人知道这里有什么问题吗？ 谢谢

更新

我试图遵循这个答案。 但是还是没有解决问题。

@Test
    fun `isBluetoothEnable`() {
        // STUBBING
        every { subject.isBluetoothEnabled } returns true
        val lambdaUnit = { Arrangement.Top }
        val lambdaSlot = slot<(() -> Arrangement.Vertical)>()

        // EXECUTION
        subject.isBluetoothEnable(lambdaUnit, lambdaUnit)

        // VERIFICATION
        verify {
            capture(lambdaSlot)
        }
        lambdaSlot.captured.invoke()
        verify {
            Arrangement.Top
        }
    }

错误

Failed matching mocking signature for

left matchers: [slotCapture<Function0>()]
io.mockk.MockKException: Failed matching mocking signature for

left matchers: [slotCapture<Function0>()]
    at app//io.mockk.impl.recording.SignatureMatcherDetector.detect(SignatureMatcherDetector.kt:99)
    at app//io.mockk.impl.recording.states.RecordingState.signMatchers(RecordingState.kt:39)
    at app//io.mockk.impl.recording.states.RecordingState.round(RecordingState.kt:31)
    at app//io.mockk.impl.recording.CommonCallRecorder.round(CommonCallRecorder.kt:50)
    at app//io.mockk.impl.eval.RecordedBlockEvaluator.record(RecordedBlockEvaluator.kt:63)
    at app//io.mockk.impl.eval.VerifyBlockEvaluator.verify(VerifyBlockEvaluator.kt:30)
    at app//io.mockk.MockKDsl.internalVerify(API.kt:119)
    at app//io.mockk.MockKKt.verify(MockK.kt:149)
    at app//io.mockk.MockKKt.verify$default(MockK.kt:146)
    at app//com.abc.app.bloodpressurePair.iewModelTest.isBluetoothEnable(PairViewModelTest.kt:576)
    at java.base@11.0.13/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base@11.0.13/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base@11.0.13/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base@11.0.13/java.lang.reflect.Method.invoke(Method.java:566)
    at app//org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
    at app//org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at app//org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
    at app//org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at app//org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at app//com.abc.app.utils.TestMainCoroutineRule$apply$1.evaluate(TestMainCoroutineRule.kt:26)
    at app//org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
    at app//org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
    at app//org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
    at app//org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
    at app//org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
    at app//org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
    at app//org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
    at app//org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
    at app//org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
    at app//org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
    at app//org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
    at app//org.junit.runners.ParentRunner.run(ParentRunner.java:413)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.runTestClass(JUnitTestClassExecutor.java:110)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:58)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:38)
    at org.gradle.api.internal.tasks.testing.junit.AbstractJUnitTestClassProcessor.processTestClass(AbstractJUnitTestClassProcessor.java:62)
    at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:51)
    at java.base@11.0.13/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base@11.0.13/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base@11.0.13/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base@11.0.13/java.lang.reflect.Method.invoke(Method.java:566)
    at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
    at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
    at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
    at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
    at com.sun.proxy.$Proxy5.processTestClass(Unknown Source)
    at org.gradle.api.internal.tasks.testing.worker.TestWorker$2.run(TestWorker.java:176)
    at org.gradle.api.internal.tasks.testing.worker.TestWorker.executeAndMaintainThreadName(TestWorker.java:129)
    at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:100)
    at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:60)
    at org.gradle.process.internal.worker.child.ActionExecutionWorker.execute(ActionExecutionWorker.java:56)
    at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:133)
    at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:71)
    at app//worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:69)
    at app//worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:74)

2 个解决方案

解决方案1
 0  2022-11-25 14:00:13

我的建议是测试 lambda 是否起作用。 让你的 lambda 做点什么。 不需要模拟它，因为当您希望某个对象独立于任何可能的条件返回您想要的特定内容时，就会使用模拟。 你可能想使用slot

// Please match the type () -> Arrangement.Vertical , below is raw example
val lambdaUnit = { example.exampleWork() } 
val lambdaSlot = slot<(() -> Arrangement.Vertical)>()

subject.isBluetoothEnable(lambdaUnit, lambdaUnit)

verify { capture(lambdaSlot) }

lambdaSlot.captured.invoke()

verify { example.exampleWork() }

解决方案2
 0  2022-12-15 14:21:14

试试这个：

PairViewModel

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.setValue

class PairViewModel : BaseViewModel() {

    var isBluetoothEnabled by mutableStateOf(false)
        private set

    var uiState by mutableStateOf<BluetoothConnectionUIState>(BluetoothConnectionUIState.Initial)
        private set

    fun bluetoothArrangement(
        on: () -> Arrangement.Vertical,
        off: () -> Arrangement.Vertical
    ): Arrangement.Vertical {
        return if (isBluetoothEnabled || uiState == BluetoothConnectionUIState.Initial) {
            on.invoke()
        } else {
            off.invoke()
        }
    }
}

PairViewModelTest

    class PairViewModelTest {

    @get:Rule
    val testInstantTaskExecutorRule: TestRule = TestMainCoroutineRule()

    private val subject by lazy { spyk(PairViewModel()) }

    @Test
    fun `bluetoothArrangement - WHEN isBluetoothEnabled THEN should invoke bluetooth on`() {
        // STUBBING
        val mockOn = mockk<() -> Arrangement.Vertical>(relaxed = true)
        every { mockOn.invoke() } returns mockk()
        every { subject.isBluetoothEnabled } returns true

        // EXECUTION
        subject.bluetoothArrangement(mockOn, mockk())

        // VERIFICATION
        verify {
            mockOn.invoke()
        }
    }

    @Test
    fun `bluetoothArrangement - WHEN uiState is Initial THEN should should invoke bluetooth on`() {
        // STUBBING
        val mockOn = mockk<() -> Arrangement.Vertical>(relaxed = true)
        every { mockOn.invoke() } returns mockk()
        every { subject.uiState } returns BluetoothConnectionUIState.Initial

        // EXECUTION
        subject.bluetoothArrangement(mockOn, mockk())

        // VERIFICATION
        verify {
            mockOn.invoke()
        }
    }

    @Test
    fun `bluetoothArrangement - WHEN uiState is not Initial & is not isBluetoothEnabled THEN should should invoke bluetooth off`() {
        // STUBBING
        val mockOff = mockk<() -> Arrangement.Vertical>(relaxed = true)
        every { mockOff.invoke() } returns mockk()
        every { subject.isBluetoothEnabled } returns false
        every { subject.uiState } returns BluetoothConnectionUIState.ScanningDevice()

        // EXECUTION
        subject.bluetoothArrangement(mockk(), mockOff)

        // VERIFICATION
        verify {
            mockOff.invoke()
        }
    }
}

只是为了解释原因，错误：

class java.lang.Object cannot be cast to class androidx.compose.foundation.layout.Arrangement$Vertical (java.lang.Object is in module java.base of loader 'bootstrap'; androidx.compose.foundation.layout.Arrangement$Vertical is in unnamed module of loader 'app')
java.lang.ClassCastException: class java.lang.Object cannot be cast to class androidx.compose.foundation.layout.Arrangement$Vertical (java.lang.Object is in module java.base of loader 'bootstrap'; androidx.compose.foundation.layout.Arrangement$Vertical is in unnamed module of loader 'app')
    at com.abc.app.bloodpressure.PairViewModel.isBluetoothEnable(PairViewModel.kt:136)

当您调用on.invoke()时，此方法应返回有效的垂直方向，您会收到此错误，因为您没有设置调用方法的返回值。

“技巧”在这里every { mockOn.invoke() } returns mockk()

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