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

There is a newer version: 4.13.2

package org.junit.internal.builders;

import java.util.Arrays;
import java.util.List;

import org.junit.runner.Runner;
import org.junit.runners.model.RunnerBuilder;

public class AllDefaultPossibilitiesBuilder extends RunnerBuilder {
    private final boolean canUseSuiteMethod;

    public AllDefaultPossibilitiesBuilder(boolean canUseSuiteMethod) {
        this.canUseSuiteMethod = canUseSuiteMethod;
    }

    @Override
    public Runner runnerForClass(Class testClass) throws Throwable {
        List builders = Arrays.asList(
                ignoredBuilder(),
                annotatedBuilder(),
                suiteMethodBuilder(),
                junit3Builder(),
                junit4Builder());

        for (RunnerBuilder each : builders) {
            Runner runner = each.safeRunnerForClass(testClass);
            if (runner != null) {
                return runner;
            }
        }
        return null;
    }

    protected JUnit4Builder junit4Builder() {
        return new JUnit4Builder();
    }

    protected JUnit3Builder junit3Builder() {
        return new JUnit3Builder();
    }

    protected AnnotatedBuilder annotatedBuilder() {
        return new AnnotatedBuilder(this);
    }

    protected IgnoredBuilder ignoredBuilder() {
        return new IgnoredBuilder();
    }

    protected RunnerBuilder suiteMethodBuilder() {
        if (canUseSuiteMethod) {
            return new SuiteMethodBuilder();
        }
        return new NullBuilder();
    }
}