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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) 2006-2012 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.startup;

import java.io.*;

import mockit.integration.junit3.internal.*;
import mockit.integration.junit4.internal.*;
import mockit.integration.testng.internal.*;
import mockit.internal.*;
import mockit.internal.util.*;

final class JMockitInitialization
{
   private static final String[] NO_STUBBING_FILTERS = {};
   private final StartupConfiguration config;

   JMockitInitialization() throws IOException { config = new StartupConfiguration(); }

   void initialize(boolean initializeTestNG)
   {
      MockingBridge.preventEventualClassLoadingConflicts();
      loadInternalStartupMocksForJUnitIntegration();

      if (initializeTestNG) {
         try { setUpInternalStartupMock(MockTestNG.class); } catch (Error ignored) {}
      }

      loadExternalToolsIfAny();
      stubOutClassesIfAny();
      setUpStartupMocksIfAny();
   }

   private void loadInternalStartupMocksForJUnitIntegration()
   {
      if (setUpInternalStartupMock(TestSuiteDecorator.class)) {
         try {
            setUpInternalStartupMock(JUnitTestCaseDecorator.class);
         }
         catch (VerifyError ignore) {
            // For some reason, this error occurs when running TestNG tests from Maven.
         }

         setUpInternalStartupMock(RunNotifierDecorator.class);
         setUpInternalStartupMock(BlockJUnit4ClassRunnerDecorator.class);
         setUpInternalStartupMock(JUnit4TestRunnerDecorator.class);
      }
   }

   private boolean setUpInternalStartupMock(Class mockClass)
   {
      try {
         new RedefinitionEngine(null, mockClass).setUpStartupMock();
         return true;
      }
      catch (TypeNotPresentException ignore) {
         // OK, ignore the startup mock if the necessary third-party class files are not in the classpath.
         return false;
      }
   }

   private void loadExternalToolsIfAny()
   {
      for (String toolClassName : config.externalTools) {
         new ToolLoader(toolClassName).loadTool();
      }
   }

   private void stubOutClassesIfAny()
   {
      for (String stubbing : config.classesToBeStubbedOut) {
         int p = stubbing.indexOf('#');
         String realClassName = stubbing;
         String[] filters = NO_STUBBING_FILTERS;

         if (p > 0) {
            realClassName = stubbing.substring(0, p);
            filters = stubbing.substring(p + 1).split("\\|");
         }

         Class realClass = Utilities.loadClass(realClassName.trim());
         new RedefinitionEngine(realClass, true, filters).stubOutAtStartup();
      }
   }

   private void setUpStartupMocksIfAny()
   {
      for (String mockClassName : config.mockClasses) {
         Class mockClass = Utilities.loadClass(mockClassName);
         new RedefinitionEngine(null, mockClass).setUpStartupMock();
      }
   }
}