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    <p>Chris and Fildor are correct to try to mock the Logger.getLogger(). Unfortunately the way Log4J works makes that technically tricky.</p> <p>Here's the code I came up with (tested) based on your sample above.</p> <h3>ClassUnderTest.java</h3> <pre><code>import org.apache.log4j.Logger; public class ClassUnderTest { private static Logger logger = Logger.getLogger(ClassUnderTest.class); public void run() { logger.info("Hello."); } } </code></pre> <h3>MockLog4JTest.java</h3> <pre><code>import static org.mockito.Matchers.eq; import static org.mockito.Mockito.verify; import static org.powermock.api.mockito.PowerMockito.mock; import org.apache.log4j.Logger; import org.junit.BeforeClass; import org.junit.Rule; import org.junit.Test; import org.powermock.core.classloader.annotations.PrepareForTest; import org.powermock.modules.junit4.rule.PowerMockRule; import org.powermock.reflect.Whitebox; @PrepareForTest(ClassUnderTest.class) public class MockLog4JTest { @Rule public PowerMockRule rule = new PowerMockRule(); @BeforeClass public static void oneTimeSetup() { System.setProperty("log4j.defaultInitOverride", Boolean.toString(true)); System.setProperty("log4j.ignoreTCL", Boolean.toString(true)); } @Test public void testLog() { ClassUnderTest classUnderTest = new ClassUnderTest(); Logger mockLogger = mock(Logger.class); Whitebox.setInternalState(ClassUnderTest.class, "logger", mockLogger); classUnderTest.run(); verify(mockLogger).info(eq("Hello.")); } } </code></pre> <p>I chose to go with using Whitebox to outright set the static field on the class under test to my <code>mockLogger</code> instance. After that, verification was pretty straightforward.</p>
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    1. POPowermock - mocking org.apache.log4j.Logger? How can I?
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    1. USMatt Lachman
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    1. COThe above code works perfectly. I tried it out. Thanks. It does answer the question.
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    2. COFor some reason under spring testing I couldn't get this working until I changed the line with WhiteBox. see http://stackoverflow.com/questions/3301635/change-private-static-final-field-using-java-reflection
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    3. COI'm glad that worked for you; could you please "accept" the answer? What change did you have to make to the Whitebox line? I haven't used Spring testing with Powermock so I'm curious about the integration issues that come up.
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