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Mocking behaviour resets after each test with PowerMock

The method PowerMockito.mockStatic(…) invokes MockCreator.mock(…). This method regsiters a Runnable that will be executed after each test : MockRepository.addAfterMethodRunner(new MockitoStateCleaner()); This runnable cleans the internal state of Mockito : private static class MockitoStateCleaner implements Runnable { public void run() { clearMockProgress(); clearConfiguration(); } private void clearMockProgress() { clearThreadLocalIn(ThreadSafeMockingProgress.class); } private void clearConfiguration() { clearThreadLocalIn(GlobalConfiguration.class); } … Read more

Powermock – java.lang.IllegalStateException: Failed to transform class

Powermock 1.6.3 uses javassist 3.15.2-GA which does not support certain types. Using 3.18.2-GA javassist worked for me. You may want to override dependency in your project. <dependency> <groupId>org.javassist</groupId> <artifactId>javassist</artifactId> <version>3.18.2-GA</version> </dependency> You may face another problem for which the solution lies here Mockito + PowerMock LinkageError while mocking system class Hope this helps.

How to mock a Kotlin singleton object?

There’s a very nice mocking library for Kotlin – Mockk, which allows you to mock objects, the exact same way you’re desiring. As of its documentation: Objects can be transformed to mocks following way: object MockObj { fun add(a: Int, b: Int) = a + b } mockkObject(MockObj) // aplies mocking to an Object assertEquals(3, … Read more

Unable to run JUnit test with PowerMockRunner

This is a bug that occurs when you use JUnit 4.12 and PowerMock < 1.6.1. The problem is solved in PowerMock 1.6.1. Please update your dependencies accordingly testCompile ‘junit:junit:4.12’, ‘org.powermock:powermock-core:1.6.1’, ‘org.powermock:powermock-module-junit4:1.6.1’, ‘org.powermock:powermock-api-mockito:1.6.1’ If you cannot upgrade PowerMock then you can use JUnit 4.11. testCompile ‘junit:junit:4.11’, ‘org.powermock:powermock-core:1.5.6’, ‘org.powermock:powermock-module-junit4:1.5.6’, ‘org.powermock:powermock-api-mockito:1.5.6’ Could you please add further lines of … Read more

PowerMock: mock out private static final variable, a concrete example

Disclaimer: After a lot of hunting around on various threads I have found an answer. It can be done, but the general concensus is that it is not very safe but seeing as how you are doing this ONLY IN UNIT TESTS, I think you accept those risks 🙂 The answer is not Mocking, since … Read more

How to mock a static final variable using JUnit, EasyMock or PowerMock

Is there something like mocking a variable? I would call that re-assign. I don’t think EasyMock or PowerMock will give you an easy way to re-assign a static final field (it sounds like a strange use-case). If you want to do that there probably is something wrong with your design: avoid static final (or more … Read more

Can Powermockito mock final method in non-final concrete class?

This works : @RunWith(PowerMockRunner.class) @PrepareForTest(ABC.class) public class ABCTest { @Test public void finalCouldBeMock() { final ABC abc = PowerMockito.mock(ABC.class); PowerMockito.when(abc.myMethod()).thenReturn(“toto”); assertEquals(“toto”, abc.myMethod()); } }

PowerMock, mock a static method, THEN call real methods on all other statics

What are you looking for is called partial mocking. In PowerMock you can use mockStaticPartial method. In PowerMockito you can use stubbing, which will stub only the method defined and leave other unchanged: PowerMockito.stub(PowerMockito.method(StaticUtilClass.class, “someStaticMethod”)).toReturn(5); also don’t forget about the @PrepareForTest(StaticUtilClass.class)

Mocking Logger and LoggerFactory with PowerMock and Mockito

EDIT 2020-09-21: Since 3.4.0, Mockito supports mocking static methods, API is still incubating and is likely to change, in particular around stubbing and verification. It requires the mockito-inline artifact. And you don’t need to prepare the test or use any specific runner. All you need to do is : @Test public void name() { try … Read more

Junit5 mock a static method

From Mockito 3.4.0 (2020-07-10), it is possible to mock static methods out of the box even in JUnit 5, without any extension. In the documentation, you can find an example: 48. Mocking static methods (since 3.4.0) Important note: You need to use inline mock maker. So the dependency to use is not the core one: <dependency> … Read more