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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.integration.junit3.internal;

import java.lang.reflect.*;

import junit.framework.*;

import mockit.*;
import mockit.integration.internal.*;
import mockit.internal.state.*;
import mockit.internal.util.*;

/**
 * Provides an startup mock that modifies the JUnit 3.8 test runner so that it calls back to JMockit for each test
 * execution.
 * When that happens, JMockit will assert any expectations set during the test, including expectations specified through
 * {@link Mock} as well as in {@link Expectations} subclasses.
 * 
 * This class is not supposed to be accessed from user code. JMockit will automatically load it at startup.
 */
@MockClass(realClass = TestCase.class, instantiation = Instantiation.PerMockedInstance)
public final class JUnitTestCaseDecorator extends TestRunnerDecorator
{
   private static final Method setUpMethod;
   private static final Method tearDownMethod;
   private static final Method runTestMethod;
   private static final Field fName;

   static
   {
      try {
         setUpMethod = TestCase.class.getDeclaredMethod("setUp");
         tearDownMethod = TestCase.class.getDeclaredMethod("tearDown");
         runTestMethod = TestCase.class.getDeclaredMethod("runTest");
         fName = TestCase.class.getDeclaredField("fName");
      }
      catch (NoSuchMethodException e) {
         // OK, won't happen.
         throw new RuntimeException(e);
      }
      catch (NoSuchFieldException e) {
         // OK, won't happen.
         throw new RuntimeException(e);
      }

      setUpMethod.setAccessible(true);
      tearDownMethod.setAccessible(true);
      runTestMethod.setAccessible(true);
      fName.setAccessible(true);
   }

   public TestCase it;

   @Mock
   public void runBare() throws Throwable
   {
      updateTestClassState(it, it.getClass());

      prepareForNextTest();
      TestRun.setRunningIndividualTest(it);

      try {
         originalRunBare();
      }
      catch (Throwable t) {
         StackTrace.filterStackTrace(t);
         throw t;
      }
      finally {
         TestRun.setRunningIndividualTest(null);
      }
   }

   private void originalRunBare() throws Throwable
   {
      setUpMethod.invoke(it);

      Throwable exception = null;

      try {
         executeCurrentTestMethod();
      }
      catch (Throwable running) {
         exception = running;
      }
      finally {
         TestRun.finishCurrentTestExecution(true);
         exception = performTearDown(exception);
      }

      if (exception != null) {
         throw exception;
      }
   }

   private void executeCurrentTestMethod() throws Throwable
   {
      Method testMethod = findTestMethod();
      TestRun.setRunningTestMethod(testMethod);
      executeTestMethod(testMethod);
   }

   private Method findTestMethod() throws IllegalAccessException
   {
      String testMethodName = (String) fName.get(it);

      for (Method publicMethod : it.getClass().getMethods()) {
         if (publicMethod.getName().equals(testMethodName)) {
            return publicMethod;
         }
      }

      return runTestMethod;
   }

   private void executeTestMethod(Method testMethod) throws Throwable
   {
      SavePoint savePoint = new SavePoint();
      Throwable testFailure = null;

      try {
         Object[] mockParameters = createInstancesForMockParameters(it, testMethod);
         createInstancesForTestedFields(it);

         if (mockParameters == null) {
            runTestMethod.invoke(it);
         }
         else {
            testMethod.invoke(it, mockParameters);
         }
      }
      catch (InvocationTargetException e) {
         e.fillInStackTrace();
         testFailure = e.getTargetException();
      }
      catch (IllegalAccessException e) {
         e.fillInStackTrace();
         testFailure = e;
      }
      catch (Throwable thrownByTest) {
         testFailure = thrownByTest;
      }
      finally {
         concludeTestMethodExecution(savePoint, testFailure);
      }
   }

   private Throwable performTearDown(Throwable thrownByTestMethod)
   {
      try {
         tearDownMethod.invoke(it);
         return thrownByTestMethod;
      }
      catch (Throwable tearingDown) {
         return thrownByTestMethod == null ? tearingDown : thrownByTestMethod;
      }
      finally {
         TestRun.getExecutingTest().setRecordAndReplay(null);
      }
   }
}