unit test Log calls in Java with PowerMock

LogCaller.java

/**
 * call logs
 */
public class LogCaller {

    private static Logger LOG = LoggerFactory.getLogger(LogCaller.class);

    public void testLogging() {
        LOG.info("Hello World");
    }

}

LogCallerTest.java

import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.InjectMocks;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static org.mockito.Matchers.any;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import static org.powermock.api.mockito.PowerMockito.mock;
import static org.powermock.api.mockito.PowerMockito.mockStatic;

/**
 * Test log is called
 */
@RunWith(PowerMockRunner.class)
@PrepareForTest({LoggerFactory.class})
public class LogCallerTest {

    private static Logger mockLOG;

    @InjectMocks
    LogCaller underTest;

    @BeforeClass
    public static void setup() {
        mockStatic(LoggerFactory.class);
        mockLOG = mock(Logger.class);
        when(LoggerFactory.getLogger(any(Class.class))).thenReturn(mockLOG);
    }

    @Test
    public void testLogging() {
        underTest.testLogging();

        verify(mockLOG).info("Hello World");
    }

}

cheers

good work!