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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.junit4.internal;

import java.lang.reflect.*;
import java.util.*;

import org.junit.*;
import org.junit.runners.Suite.*;
import org.junit.runners.model.*;

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

/**
 * Startup mock that modifies the JUnit 4.5+ test runner so that it calls back to JMockit immediately after every test
 * executes.
 * 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 = FrameworkMethod.class, instantiation = Instantiation.PerMockedInstance)
public final class JUnit4TestRunnerDecorator extends TestRunnerDecorator
{
   public FrameworkMethod it;
   private static volatile boolean shouldPrepareForNextTest = true;

   @Mock(reentrant = true)
   public Object invokeExplosively(Object target, Object... params) throws Throwable
   {
      Method method = it.getMethod();
      Class testClass = target == null ? method.getDeclaringClass() : target.getClass();

      handleMockingOutsideTestMethods(target, testClass);

      // In case it isn't a test method, but a before/after method:
      if (it.getAnnotation(Test.class) == null) {
         if (shouldPrepareForNextTest && it.getAnnotation(Before.class) != null) {
            prepareForNextTest();
            shouldPrepareForNextTest = false;
         }

         TestRun.setRunningIndividualTest(target);
         TestRun.setRunningTestMethod(null);

         try {
            return it.invokeExplosively(target, params);
         }
         catch (Throwable t) {
            RecordAndReplayExecution.endCurrentReplayIfAny();
            StackTrace.filterStackTrace(t);
            throw t;
         }
         finally {
            if (it.getAnnotation(After.class) != null) {
               TestRun.getExecutingTest().setRecordAndReplay(null);
            }
         }
      }

      if (shouldPrepareForNextTest) {
         prepareForNextTest();
      }

      shouldPrepareForNextTest = true;
      TestRun.setRunningTestMethod(method);

      try {
         executeTestMethod(target, params);
         return null; // it's a test method, therefore has void return type
      }
      catch (Throwable t) {
         StackTrace.filterStackTrace(t);
         throw t;
      }
      finally {
         TestRun.finishCurrentTestExecution(true);
      }
   }

   private void handleMockingOutsideTestMethods(Object target, Class testClass)
   {
      TestRun.enterNoMockingZone();

      try {
         if (target == null) {
            Class currentTestClass = TestRun.getCurrentTestClass();

            if (currentTestClass != null && testClass.isAssignableFrom(currentTestClass)) {
               if (it.getAnnotation(AfterClass.class) != null) {
                  cleanUpMocksFromPreviousTestClass();
               }
            }
            else if (it.getAnnotation(BeforeClass.class) != null) {
               updateTestClassState(null, testClass);
            }
         }
         else if (testClass.isAnnotationPresent(SuiteClasses.class)) {
            setUpClassLevelMocksAndStubs(testClass);
         }
         else {
            updateTestClassState(target, testClass);
         }
      }
      finally {
         TestRun.exitNoMockingZone();
      }
   }

   private void executeTestMethod(Object target, Object... parameters) throws Throwable
   {
      SavePoint savePoint = new SavePoint();
      Throwable testFailure = null;

      try {
         Object[] mockParameters = createInstancesForMockParameters(target, it.getMethod());
         createInstancesForTestedFields(target);

         TestRun.setRunningIndividualTest(target);
         it.invokeExplosively(target, mockParameters == null ? parameters : mockParameters);
      }
      catch (Throwable thrownByTest) {
         testFailure = thrownByTest;
      }
      finally {
         concludeTestMethodExecution(savePoint, testFailure);
      }
   }

   @Mock(reentrant = true)
   public void validatePublicVoidNoArg(boolean isStatic, List errors)
   {
      if (!isStatic && it.getMethod().getParameterTypes().length > 0) {
         it.validatePublicVoid(false, errors);
         return;
      }

      it.validatePublicVoidNoArg(isStatic, errors);
   }
}