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JUnit is a unit testing framework for Java, created by Erich Gamma and Kent Beck.

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package org.junit.internal.requests;

import org.junit.internal.builders.AllDefaultPossibilitiesBuilder;
import org.junit.runner.Request;
import org.junit.runner.Runner;

public class ClassRequest extends Request {
    private final Object runnerLock = new Object();

    /*
     * We have to use the f prefix, because IntelliJ's JUnit4IdeaTestRunner uses
     * reflection to access this field. See
     * https://github.com/junit-team/junit/issues/960
     */
    private final Class fTestClass;
    private final boolean canUseSuiteMethod;
    private volatile Runner runner;

    public ClassRequest(Class testClass, boolean canUseSuiteMethod) {
        this.fTestClass = testClass;
        this.canUseSuiteMethod = canUseSuiteMethod;
    }

    public ClassRequest(Class testClass) {
        this(testClass, true);
    }

    @Override
    public Runner getRunner() {
        if (runner == null) {
            synchronized (runnerLock) {
                if (runner == null) {
                    runner = new AllDefaultPossibilitiesBuilder(canUseSuiteMethod).safeRunnerForClass(fTestClass);
                }
            }
        }
        return runner;
    }
}