Mock Static Methods in JUnit5 using PowerMockito

Question

Need help for Mocking Static methods using JUnit5 with PowerMockito framework.

Powermock junit5 and mockito2.x not working RunnerTestSuiteChunker not found

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PowerMockIgnore;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

import static org.mockito.Mockito.*;


@PrepareForTest(EnvironmentUtils.class)
@RunWith(PowerMockRunner.class)
public class RuleControllerTest {       

        @Before
        public void setup() {           
            PowerMockito.mockStatic(EnvironmentUtils.class);
        }   


        @Test
        public void test_rule_create_rule() throws IOException {
            when(EnvironmentUtils.isCF()).thenReturn(true);

        }
}

and pom.xml

<!-- https://mvnrepository.com/artifact/org.mockito/mockito-core -->
<dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-core</artifactId>
    <version>2.23.4</version>
    <scope>test</scope>
</dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <version>5.4.2</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.junit.vintage</groupId>
            <artifactId>junit-vintage-engine</artifactId>
            <version>5.4.2</version>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-engine</artifactId>
            <version>5.4.2</version>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/junit/junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-module-junit4</artifactId>
            <version>2.0.2</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-api-mockito2</artifactId>
            <version>2.0.2</version>
            <scope>test</scope>
        </dependency>

I followed Junit5 sample from here, 1) https://www.baeldung.com/junit-5 2) Junit5 mock a static method

But facing an issue as, I know there is an existing issue for Junit5 with powermock but any one knows any other way to Mock static methods using JUnit5 using powermock.

Mcgann

Please see: Why is “Can someone help me?” not an actual question?. – Ecdysis

@Ecdysis i see a clear question here, along w/ how he tried to resolve. I disagree with your comment :( – Leishaleishmania

Answer 1

With mockito v 3.4.0 we can simply use mockStatic() method without powermock library :

 try (MockedStatic mocked = mockStatic(Foo.class)) {
   mocked.when(Foo::method).thenReturn("bar");
   assertEquals("bar", Foo.method());
   mocked.verify(Foo::method);
 }

assertEquals("foo", Foo.method());

Latest documentation and example : https://javadoc.io/static/org.mockito/mockito-core/3.5.10/org/mockito/Mockito.html#static_mocks

Nicker

but with that you can mock only one method in context, right? – Impugn

Answer 2

As your link suggests, still you can't do power mock stuff with junit-5 directly, simply because there's no PowerMockRunner (Extension) still available for junit-5.

However, In your above code possibly what has gone wrong is this line.

when(EnvironmentUtils.isCF()).thenReturn(true);

Here, note that you are using when of mockito (by import static org.mockito.Mockito.*;)

Instead, you have to use the one of PowerMockito. So

Remove this line import static org.mockito.Mockito.*;

Instead, add this. import static org.powermock.api.mockito.PowerMockito.*;

Audubon

Answer 3

You're using @Before which is a JUnit4 annotation. JUnit5 in turn has @BeforeEach / @BeforeAll (whichever suits your requirement). Also, your import for @Test is from JUnit4 but not from JUnit5 which should be org.junit.jupiter.api.Test ;)

Loy

Tests are run with junit-vintage-engine. This doesn't address PowerMock or the static method question – Casas