Mock private static final field using mockito or Jmockit

Question

I am using private static final LOGGER field in my class and I want LOGGER.isInfoEnabled() method to return false. How can I mock the static final field by using mockito or jMockit

My class is:

  import org.slf4j.Logger;   import org.slf4j.LoggerFactory;    public class Class1 {    private static final Logger LOGGER = LoggerFactory.getLogger(Class1.class);      public boolean demoMethod() {        System.out.println("Demo started");        if (LOGGER.isInfoEnabled()) {          System.out.println("@@@@@@@@@@@@@@ ------- info is enabled");        } else {          System.out.println("info is disabled");        }        return LOGGER.isInfoEnabled();     }   } 

and its junit is :

import mockit.Mocked; import mockit.NonStrictExpectations; import org.mockito.InjectMocks; import org.mockito.MockitoAnnotations; import org.slf4j.Logger; import org.testng.annotations.BeforeMethod; import org.testng.annotations.Test;  import static org.testng.Assert.*; import com.source.Class1;  public class MyTest {    @InjectMocks   Class1 cls1;    @BeforeMethod   public void initMocks() {     MockitoAnnotations.initMocks(this);   }    @Test   public void test(@Mocked final Logger LOGGER) {      new NonStrictExpectations() {       {         LOGGER.isInfoEnabled();         result = false;       }     };     assertFalse(cls1.demoMethod());   } } 

when I run it the result is:

-------------------------------------------------------  T E S T S ------------------------------------------------------- Running com.test.MyTest Configuring TestNG with: TestNG652Configurator Demo started @@@@@@@@@@@@@@ ------- info is enabled Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 1.9 sec <<< FAILURE! - in com.test.MyTest test(com.test.MyTest)  Time elapsed: 0.168 sec  <<< FAILURE! java.lang.AssertionError: expected [false] but found [true]         at com.test.MyTest.test(MyTest.java:35)   Results :  Failed tests:   MyTest.test:35 expected [false] but found [true]  Tests run: 1, Failures: 1, Errors: 0, Skipped: 0  [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 9.899s [INFO] Finished at: Mon Jun 08 12:35:36 IST 2015 [INFO] Final Memory: 16M/166M [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.18.1:test (default-test) on project JMockDemo: The re are test failures. [ERROR] [ERROR] Please refer to D:\perfoce_code\workspace_kepler\JMockDemo\target\surefire-reports for the individual test results. [ERROR] -> [Help 1] [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [ERROR] Re-run Maven using the -X switch to enable full debug logging. [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException 

I am new to jmockit and I want my above junit case to run successfully. And I have to use JMockit or mockito, can't use Powermockito. Please help.

Answer 1

One way is using reflection get rid of final modifier from the field and then replace the LOGGER field with Mocked one

public class Class1Test {     @Test     public void test() throws Exception {         Logger logger = Mockito.mock(Logger.class);         Mockito.when(logger.isInfoEnabled()).thenReturn(false);         setFinalStatic(Class1.class.getDeclaredField("LOGGER"), logger);         Class1 cls1 = new Class1();         assertFalse(cls1.demoMethod());     }      static void setFinalStatic(Field field, Object newValue) throws Exception {         field.setAccessible(true);                 Field modifiersField = Field.class.getDeclaredField("modifiers");         modifiersField.setAccessible(true);         modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);         field.set(null, newValue);     } }