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JMockit is a Java toolkit for automated developer testing. It contains mocking/faking APIs and a code coverage tool, 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 JMockit developers
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.state;

import javax.annotation.*;

import mockit.internal.expectations.*;
import mockit.internal.expectations.state.*;
import mockit.internal.injection.*;
import mockit.internal.expectations.mocking.*;
import mockit.internal.faking.*;
import mockit.internal.util.*;

/**
 * A singleton which stores several data structures which in turn hold global state for individual test methods, test
 * classes, and for the test run as a whole.
 */
public final class TestRun
{
   private static final TestRun INSTANCE = new TestRun();
   private TestRun() {}

   // Fields with global state ////////////////////////////////////////////////////////////////////////////////////////

   private static final ThreadLocal noMockingCount = new ThreadLocal() {
      @Override protected Integer initialValue() { return 0; }
      @Override public void set(Integer valueToAdd) { super.set(get() + valueToAdd); }
   };

   // Used only by the Coverage tool:
   private int testId;

   @Nullable private Class currentTestClass;
   @Nullable private Object currentTestInstance;
   @Nullable private FieldTypeRedefinitions fieldTypeRedefinitions;
   @Nullable private TestedClassInstantiations testedClassInstantiations;

   @Nonnull private final MockFixture mockFixture = new MockFixture();

   @Nonnull private final ExecutingTest executingTest = new ExecutingTest();
   @Nonnull private final FakeClasses fakeClasses = new FakeClasses();

   // Static "getters" for global state ///////////////////////////////////////////////////////////////////////////////

   public static boolean isInsideNoMockingZone() { return noMockingCount.get() > 0; }

   @Nullable public static Class getCurrentTestClass() { return INSTANCE.currentTestClass; }

   @Nullable public static Object getCurrentTestInstance() { return INSTANCE.currentTestInstance; }

   public static int getTestId() { return INSTANCE.testId; }

   @Nullable
   public static FieldTypeRedefinitions getFieldTypeRedefinitions() { return INSTANCE.fieldTypeRedefinitions; }

   @Nullable
   public static TestedClassInstantiations getTestedClassInstantiations() { return INSTANCE.testedClassInstantiations; }

   @Nonnull public static MockFixture mockFixture() { return INSTANCE.mockFixture; }

   @Nonnull public static ExecutingTest getExecutingTest() { return INSTANCE.executingTest; }

   @Nullable
   public static RecordAndReplayExecution getRecordAndReplayForRunningTest() { return INSTANCE.executingTest.getCurrentRecordAndReplay(); }

   @Nonnull
   public static RecordAndReplayExecution getOrCreateRecordAndReplayForRunningTest() {
      return INSTANCE.executingTest.getOrCreateRecordAndReplay();
   }

   @Nonnull
   public static RecordAndReplayExecution getRecordAndReplayForVerifications() {
      return INSTANCE.executingTest.getRecordAndReplayForVerifications();
   }

   @Nonnull public static FakeClasses getFakeClasses() { return INSTANCE.fakeClasses; }
   @Nonnull public static FakeStates getFakeStates() { return INSTANCE.fakeClasses.fakeStates; }

   // Static "mutators" for global state //////////////////////////////////////////////////////////////////////////////

   public static void setCurrentTestClass(@Nullable Class testClass) { INSTANCE.currentTestClass = testClass; }

   public static void prepareForNextTest() {
      INSTANCE.testId++;
      INSTANCE.executingTest.setRecordAndReplay(null);
   }

   public static void enterNoMockingZone() { noMockingCount.set(1); }
   public static void exitNoMockingZone()  { noMockingCount.set(-1); }
   public static void clearNoMockingZone() { noMockingCount.remove(); }

   public static void clearCurrentTestInstance() {
      INSTANCE.currentTestInstance = null;
   }

   public static void setRunningIndividualTest(@Nonnull Object testInstance) {
      INSTANCE.currentTestInstance = testInstance;
   }

   public static void setFieldTypeRedefinitions(@Nullable FieldTypeRedefinitions redefinitions) {
      INSTANCE.fieldTypeRedefinitions = redefinitions;
   }

   public static void setTestedClassInstantiations(@Nullable TestedClassInstantiations testedClassInstantiations) {
      INSTANCE.testedClassInstantiations = testedClassInstantiations;
   }

   public static void finishCurrentTestExecution() {
      INSTANCE.executingTest.finishExecution();
   }

   // Methods to be called only from generated bytecode or from the ClassLoadingBridge ////////////////////////////////

   @SuppressWarnings({"StaticMethodOnlyUsedInOneClass", "SimplifiableIfStatement"})
   public static boolean updateFakeState(@Nonnull String fakeClassDesc, int fakeStateIndex) {
      Object fake = getFake(fakeClassDesc);

      if (fakeStateIndex < 0) {
         return true;
      }

      return getFakeStates().updateFakeState(fake, fakeStateIndex);
   }

   @Nonnull
   public static Object getFake(@Nonnull String fakeClassDesc) {
      return INSTANCE.fakeClasses.getFake(fakeClassDesc);
   }

   // Other methods ///////////////////////////////////////////////////////////////////////////////////////////////////

   public static void ensureThatClassIsInitialized(@Nonnull Class aClass) {
      boolean previousFlag = INSTANCE.executingTest.setShouldIgnoreMockingCallbacks(true);

      try {
         Class.forName(aClass.getName(), true, aClass.getClassLoader());
      }
      catch (ClassNotFoundException ignore) {}
      catch (LinkageError e) {
         StackTrace.filterStackTrace(e);
         e.printStackTrace();
      }
      finally {
         INSTANCE.executingTest.setShouldIgnoreMockingCallbacks(previousFlag);
      }
   }
}