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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.internal.startup;

import java.io.*;

import org.jetbrains.annotations.*;

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

final class JMockitInitialization
{
   @NotNull private final StartupConfiguration config;

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

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

      if (initializeTestNG && MockTestNG.hasDependenciesInClasspath()) {
         setUpInternalStartupMock(MockTestNG.class);
      }

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

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

         if (!setUpInternalStartupMock(RunNotifierDecorator.class)) return;
         if (!setUpInternalStartupMock(BlockJUnit4ClassRunnerDecorator.class)) return;
         setUpInternalStartupMock(MockFrameworkMethod.class);
      }
   }

   private boolean setUpInternalStartupMock(@NotNull Class> mockClass)
   {
      // The startup mock is ignored if the necessary third-party class files are not in the classpath.
      try {
         new MockClassSetup(mockClass).redefineMethods();
         return true;
      }
      catch (TypeNotPresentException ignore) { return false; }
      catch (NoClassDefFoundError ignore) { return false; }
   }

   private void loadExternalToolsIfAny()
   {
      for (String toolClassName : config.externalTools) {
         try {
            new ToolLoader(toolClassName).loadTool();
         }
         catch (Throwable unexpectedFailure) {
            StackTrace.filterStackTrace(unexpectedFailure);
            unexpectedFailure.printStackTrace();
         }
      }
   }

   private void stubOutClassesIfAny()
   {
      for (String realClassName : config.classesToBeStubbedOut) {
         Class realClass = ClassLoad.loadClass(realClassName.trim());
         new ClassStubbing(realClass).stubOutAtStartup();
      }
   }

   private void setUpStartupMocksIfAny()
   {
      for (String mockClassName : config.mockClasses) {
         try {
            Class mockClass = ClassLoad.loadClass(mockClassName);

            if (MockUp.class.isAssignableFrom(mockClass)) {
               @SuppressWarnings("unchecked") Class> mockUpSubclass = (Class>) mockClass;
               new MockClassSetup(mockUpSubclass).redefineMethods();
            }
         }
         catch (UnsupportedOperationException ignored) {}
         catch (Throwable unexpectedFailure) {
            StackTrace.filterStackTrace(unexpectedFailure);
            unexpectedFailure.printStackTrace();
         }
      }
   }
}