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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.junit3.internal;

import java.lang.reflect.*;

import junit.framework.*;
import org.jetbrains.annotations.*;

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

final class JUnitTestCaseDecorator extends TestRunnerDecorator
{
   @NotNull private static final Method setUpMethod;
   @NotNull private static final Method tearDownMethod;
   @NotNull private static final Method runTestMethod;
   @NotNull 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);
   }

   void runBare(@NotNull TestCase testCase) throws Throwable
   {
      updateTestClassState(testCase, testCase.getClass());

      prepareForNextTest();
      TestRun.setRunningIndividualTest(testCase);

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

   private void originalRunBare(@NotNull TestCase testCase) throws Throwable
   {
      setUpMethod.invoke(testCase);

      Throwable exception = null;

      try {
         Method testMethod = findTestMethod(testCase);
         executeTestMethod(testCase, testMethod);
      }
      catch (Throwable running) {
         exception = running;
      }
      finally {
         TestRun.finishCurrentTestExecution(true);
         exception = performTearDown(testCase, exception);
      }

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

   @NotNull private Method findTestMethod(@NotNull TestCase testCase) throws IllegalAccessException
   {
      String testMethodName = (String) fName.get(testCase);

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

      return runTestMethod;
   }

   private void executeTestMethod(@NotNull TestCase testCase, @NotNull Method testMethod) throws Throwable
   {
      SavePoint savePoint = new SavePoint();
      TestRun.setSavePointForTestMethod(savePoint);

      Throwable testFailure = null;

      try {
         Object[] mockParameters = createInstancesForMockParameters(testCase, testMethod, null, savePoint);
         createInstancesForTestedFields(testCase);

         if (mockParameters == null) {
            runTestMethod.invoke(testCase);
         }
         else {
            testMethod.invoke(testCase, 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, false);
      }
   }

   @Nullable private Throwable performTearDown(@NotNull TestCase testCase, @Nullable Throwable thrownByTestMethod)
   {
      try {
         tearDownMethod.invoke(testCase);
         return thrownByTestMethod;
      }
      catch (Throwable tearingDown) {
         return thrownByTestMethod == null ? tearingDown : thrownByTestMethod;
      }
      finally {
         TestRun.getExecutingTest().setRecordAndReplay(null);
      }
   }
}