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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.junit4.internal;

import java.lang.reflect.*;

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

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

final class JUnit4TestRunnerDecorator extends TestRunnerDecorator
{
   /**
    * A "volatile boolean" is as good as a java.util.concurrent.atomic.AtomicBoolean here,
    * since we only need the basic get/set operations.
    */
   private volatile boolean shouldPrepareForNextTest = true;

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

      handleMockingOutsideTestMethods(it, 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.setSavePointForTestMethod(null);

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

      if (shouldPrepareForNextTest) {
         prepareForNextTest();
      }

      shouldPrepareForNextTest = true;

      try {
         executeTestMethod(it, 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(FrameworkMethod it, 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 (testClass.isAnnotationPresent(SuiteClasses.class)) {
               setUpClassLevelMocksAndStubs(testClass);
            }
            else if (it.getAnnotation(BeforeClass.class) != null) {
               updateTestClassState(null, testClass);
            }
         }
         else {
            updateTestClassState(target, testClass);
         }
      }
      finally {
         TestRun.exitNoMockingZone();
      }
   }

   private void executeTestMethod(FrameworkMethod it, Object target, Object... parameters) throws Throwable
   {
      SavePoint savePoint = new SavePoint();
      TestRun.setSavePointForTestMethod(savePoint);

      Method testMethod = it.getMethod();
      Throwable testFailure = null;
      boolean testFailureExpected = false;

      try {
         Object[] mockParameters = createInstancesForMockParameters(target, testMethod, parameters, savePoint);
         createInstancesForTestedFields(target);

         TestRun.setRunningIndividualTest(target);
         it.invokeExplosively(target, mockParameters == null ? parameters : mockParameters);
      }
      catch (Throwable thrownByTest) {
         testFailure = thrownByTest;
         Class expectedType = testMethod.getAnnotation(Test.class).expected();
         testFailureExpected = expectedType.isAssignableFrom(thrownByTest.getClass());
      }
      finally {
         concludeTestMethodExecution(savePoint, testFailure, testFailureExpected);
      }
   }
}