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Mockito mock objects library core API and implementation
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/*
 * Copyright (c) 2018 Mockito contributors
 * This program is made available under the terms of the MIT License.
 */
package org.mockito.internal.runners;

import org.junit.runner.Description;
import org.junit.runner.manipulation.Filter;
import org.junit.runner.manipulation.NoTestsRemainException;
import org.junit.runner.notification.Failure;
import org.junit.runner.notification.RunListener;
import org.junit.runner.notification.RunNotifier;
import org.junit.runners.BlockJUnit4ClassRunner;
import org.junit.runners.model.FrameworkMethod;
import org.junit.runners.model.InitializationError;
import org.junit.runners.model.Statement;
import org.mockito.Mockito;
import org.mockito.MockitoAnnotations;
import org.mockito.internal.junit.DefaultTestFinishedEvent;
import org.mockito.internal.junit.MockitoTestListener;
import org.mockito.internal.util.Supplier;

public class DefaultInternalRunner implements InternalRunner {

    private final BlockJUnit4ClassRunner runner;

    public DefaultInternalRunner(
            Class testClass, final Supplier listenerSupplier)
            throws InitializationError {
        runner =
                new BlockJUnit4ClassRunner(testClass) {

                    public Object target;
                    private MockitoTestListener mockitoTestListener;

                    @Override
                    protected Statement withBefores(
                            FrameworkMethod method, final Object target, Statement statement) {
                        this.target = target;
                        final Statement base = super.withBefores(method, target, statement);
                        return new Statement() {
                            @Override
                            public void evaluate() throws Throwable {
                                AutoCloseable closeable;
                                if (mockitoTestListener == null) {
                                    // get new test listener and add it to the framework
                                    mockitoTestListener = listenerSupplier.get();
                                    Mockito.framework().addListener(mockitoTestListener);
                                    // init annotated mocks before tests
                                    closeable = MockitoAnnotations.openMocks(target);
                                } else {
                                    closeable = null;
                                }
                                try {
                                    base.evaluate();
                                } finally {
                                    if (closeable != null) {
                                        closeable.close();
                                    }
                                }
                            }
                        };
                    }

                    public void run(final RunNotifier notifier) {
                        RunListener listener =
                                new RunListener() {
                                    Throwable failure;

                                    @Override
                                    public void testFailure(Failure failure) throws Exception {
                                        this.failure = failure.getException();
                                    }

                                    @Override
                                    public void testFinished(Description description)
                                            throws Exception {
                                        try {
                                            if (mockitoTestListener != null) {
                                                Mockito.framework()
                                                        .removeListener(mockitoTestListener);
                                                mockitoTestListener.testFinished(
                                                        new DefaultTestFinishedEvent(
                                                                target,
                                                                description.getMethodName(),
                                                                failure));
                                                mockitoTestListener = null;
                                            }
                                            Mockito.validateMockitoUsage();
                                        } catch (Throwable t) {
                                            // In order to produce clean exception to the user we
                                            // need to fire test failure with the right description
                                            // Otherwise JUnit framework will report failure with
                                            // some generic test name
                                            notifier.fireTestFailure(new Failure(description, t));
                                        }
                                    }
                                };
                        notifier.addListener(listener);
                        super.run(notifier);
                    }
                };
    }

    @Override
    public void run(final RunNotifier notifier) {
        runner.run(notifier);
    }

    @Override
    public Description getDescription() {
        return runner.getDescription();
    }

    @Override
    public void filter(Filter filter) throws NoTestsRemainException {
        runner.filter(filter);
    }
}