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JMockit is a Java toolkit for developer (unit/integration) testing. It contains mocking APIs and other tools, supporting both JUnit and TestNG. The mocking APIs allow all kinds of Java code, without testability restrictions, to be tested in isolation from selected dependencies.

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/*
 * Copyright (c) 2006-2013 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.integration.logging;

import org.apache.log4j.*;
import org.apache.log4j.spi.*;

import mockit.*;

/**
 * A mock class containing mocks and stubs for the Log4j API.
 * 
 * When a test class is annotated as {@code @UsingMocksAndStubs(Log4jMocks.class)}, all production code touched by the
 * tests in that class will receive mock {@code Logger} instances instead of real ones, when one of the factory methods
 * in class {@code org.apache.log4j.Logger} is called.
 * 
 * Tutorial
 */
public final class Log4jMocks extends MockUp
{
   private static final Logger MOCK_LOGGER = new RootLogger(Level.OFF);

   Log4jMocks() { new Hierarchy(MOCK_LOGGER).setThreshold(Level.OFF); }

   /**
    * Returns a singleton mock {@code Logger} instance, whose methods do nothing.
    */
   @Mock public static Logger getLogger(String name) { return MOCK_LOGGER; }

   /**
    * Returns a singleton mock {@code Logger} instance, whose methods do nothing.
    */
   @Mock public static Logger getLogger(Class clazz) { return MOCK_LOGGER; }

   /**
    * Returns a singleton mock {@code Logger} instance, whose methods do nothing.
    */
   @Mock public static Logger getRootLogger() { return MOCK_LOGGER; }

   /**
    * Returns a singleton mock {@code Logger} instance, whose methods do nothing.
    */
   @Mock public static Logger getLogger(String name, LoggerFactory lf) { return MOCK_LOGGER; }

   @Mock public static void trace(Object message) {}
   @Mock public static void trace(Object message, Throwable t) {}
   @Mock public static boolean isTraceEnabled() { return false; }
}