CODEWITHSUNDEEP
javaunit-testingmockitopowermockito
Caesar
Caesar

Reputation: 1092

Unable to stub a static method call using PowerMockito

I have a file Util.java:

public class Util  {
    public static int returnInt() {
        return 1;
    }

    public static String returnString() {
        return "string";
    }
}

Another class:

public class ClassToTest {
    public String methodToTest() {
        return Util.returnString();
    }
}

I want to test it using TestNg and PowerMockito:

@RunWith(PowerMockRunner.class)
@PrepareForTest(Util.class)
public class PharmacyConstantsTest {    
    ClassToTest classToTestSpy;

    @BeforeMethod
    public void beforeMethod() {
        classToTestSpy = spy(new ClassToTest());
    }

    @Test
    public void method() throws Exception {
        mockStatic(Util.class);
        when(Util.returnString()).thenReturn("xyz");
        classToTestSpy.methodToTest();
    }
}

However, it throws the following error:

FAILED: method org.mockito.exceptions.misusing.MissingMethodInvocationException: when() requires an argument which has to be 'a method call on a mock'. For example: when(mock.getArticles()).thenReturn(articles);

I tried this solution using various solutions from the web, but could not locate the mistake in my code. I need to stub the call for static method, since I need it for a legacy code. How do I mock a static method using PowerMockito?

Upvotes: 0

Views: 1840

Answers (3)

Caesar
Caesar

Reputation: 1092

Just for the record, adding making the test class a subclass of PowerMockTestCase worked for me. 

@PrepareForTest(Util.class)
public class PharmacyConstantsTest extends PowerMockTestCase {    
    ClassToTest classToTestSpy;

    @BeforeMethod
    public void beforeMethod() {
        classToTestSpy = spy(new ClassToTest());
    }

    @Test
    public void method() throws Exception {
        mockStatic(Util.class);
        when(Util.returnString()).thenReturn("xyz");
        classToTestSpy.methodToTest();
     }
 }

Upvotes: 1

marcospereira
marcospereira

Reputation: 12202

Use PowerMockito methods instead of the Mockito's. The docs states that:

PowerMockito extends Mockito functionality with several new features such as mocking static and private methods and more. Use PowerMock instead of Mockito where applicable.

Per instance:

PowerMockito.when(Util.returnString()).thenReturn("xyz");

Upvotes: -1

Rahul Sharma
Rahul Sharma

Reputation: 6005

You need to configure TestNG to use the PowerMock object factory like this:

<suite name="dgf" verbose="10" object-factory="org.powermock.modules.testng.PowerMockObjectFactory">
    <test name="dgf">
        <classes>
            <class name="com.mycompany.Test1"/>
            <class name="com.mycompany.Test2"/>
        </classes>
    </test>
</suite>

in your suite.xml file of the project.

Please refer this link.

Upvotes: 1

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