How do I mock a static method in the final class?
I have some code that has a static method inside the final class. I tried to mock this method. I've tried several things.
public final Class Class1{
public static void doSomething(){
}
}
How can I mock doSomething ()? I tried..
Class1 c1=PowerMockito.mock(Class1.class)
PowerMockito.mockSatic(Class1.class);
Mockito.doNothing().when(c1).doSomething();
This gives me an error:
org.mockito.exceptions.misusing.UnfinishedStubbingException:
Unfinished stubbing detected here:
-> at com.cerner.devcenter.wag.textHandler.AssessmentFactory_Test.testGetGradeReport_HTMLAssessment(AssessmentFactory_Test.java:63)
E.g. thenReturn() may be missing.
Examples of correct stubbing:
when(mock.isOk()).thenReturn(true);
when(mock.isOk()).thenThrow(exception);
doThrow(exception).when(mock).someVoidMethod();
Hints:
1. missing thenReturn()
2. you are trying to stub a final method, you naughty developer!
at org.powermock.api.mockito.internal.invocation.MockitoMethodInvocationControl.performIntercept(MockitoMethodInvocationControl.java:260)
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2 answers
The most commonly used testing framework is JUnit 4. Therefore, if you are using it, you need to annotate the test class:
@RunWith( PowerMockRunner.class )
@PrepareForTest( Class1.class )
Than
PowerMockito.mockSatic(Class1.class);
Mockito.doNothing().when(c1).doSomething();
Mockito.when(Class1.doSomething()).thenReturn(fakedValue);
// call of static method is required to mock it
PowerMockito.doNothing().when(Class1.class);
Class1.doSomething();
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I am using PowerMock. This allows you to do what Mokito cannot. https://github.com/powermock/powermock/wiki
@RunWith(PowerMockRunner.class)
@PrepareForTest(StaticClass.class)
public class StaticTest {
@Before
public void setUp() {
PowerMockito.mockStatic(Bukkit.class);
//When a static method with no arguments is called.
when(StaticClass.callMethod1()).thenReturn(value);
//When a static method with an argument is called.
when(StaticClass.callMethod2(argument)).thenReturn(value2);
//Use when you don't care what the argument is..
//use Mockito.anyInt(), Mockito.anyDouble(), etc.
when(StaticClass.callMethod3(Mockito.anyString())).thenReturn(value3);
}
@Test
public void VerifyStaticMethodsWork() {
assertEquals(value, StaticClass.callMethod1());
assertEquals(value2, StaticClass.callMethod2(argument));
assertEquals(value3, StaticClass.callMethod3("Hello"));
}
}
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