io.mockk.MockKException: Missing calls inside every { ... } block when mocking extension method

Just be aware about usual MockK support pattern. Tickets are checked from time to time, replied, discussed, labeled, e.t.c. But real fixes are applied in a month-two month period in a bunch. If you think this is unacceptable, go on, join the project, change the world.

Please remove sections wisely

Below information is actually needed to make all the process of fixing faster. Choose main points. Don’t blindly follow this as a set of rules. Don’t waste much time. Usually, the main thing is to have a good reproducible minimal code.

Prerequisites

Please answer the following questions for yourself before submitting an issue.

• [YES ] I am running the latest version
• [ YES] I checked the documentation and found no answer
• [ YES] I checked to make sure that this issue has not already been filed

Expected Behavior

Test should not fail with io.mockk.MockKException: Missing calls inside every { ... } block. exception. Extension method should be mocked.

Current Behavior

When trying to mock one of the extensions defined in kotlin.io.IOSteams.kt - test fails with io.mockk.MockKException: Missing calls inside every { ... } block. exception.

Failure Information (for bugs)

Kotlin version: 1.3.41 mockk version: 1.9.3 junit version: 4.12

Steps to Reproduce

@RunWith(MockitoJUnitRunner::class)
class ExampleTest {
    val mockInputStream = mockk<InputStream>()
    val mockReader = mockk<BufferedReader>()
    
    @Test
    fun `this is just example test`() {
        mockkStatic("kotlin.io.ByteStreamsKt")
        every { mockInputStream.bufferedReader() } returns mockReader
    }
}

Context

Please provide any relevant information about your setup. This is important in case the issue is not reproducible except for under certain conditions.

• MockK version: 1.9.3
• OS: MacOS Catalina
• Kotlin version: 1.3.41
• JDK version: 1.8
• JUnit version: 4.12
• Type of test: unit test

Failure Logs

Please include any relevant log snippets or files here.

Stack trace

io.mockk.MockKException: Missing calls inside every { ... } block.

	at io.mockk.impl.recording.states.StubbingState.checkMissingCalls(StubbingState.kt:14)
	at io.mockk.impl.recording.states.StubbingState.recordingDone(StubbingState.kt:8)
	at io.mockk.impl.recording.CommonCallRecorder.done(CommonCallRecorder.kt:47)
	at io.mockk.impl.eval.RecordedBlockEvaluator.record(RecordedBlockEvaluator.kt:60)
	at io.mockk.impl.eval.EveryBlockEvaluator.every(EveryBlockEvaluator.kt:30)
	at io.mockk.MockKDsl.internalEvery(API.kt:92)
	at io.mockk.MockKKt.every(MockK.kt:104)
	at com.example.ExampleTest.this is just example test(ExampleTest.kt:26)
	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)