001package org.junit.runners;
002
003import org.junit.runners.model.InitializationError;
004import org.junit.runners.model.TestClass;
005
006/**
007 * Aliases the current default JUnit 4 class runner, for future-proofing. If
008 * future versions of JUnit change the default Runner class, they will also
009 * change the definition of this class. Developers wanting to explicitly tag a
010 * class as a JUnit 4 class should use {@code @RunWith(JUnit4.class)}, not,
011 * for example in JUnit 4.5, {@code @RunWith(BlockJUnit4ClassRunner.class)}.
012 * This is the only way this class should be used--any extension that
013 * depends on the implementation details of this class is likely to break
014 * in future versions.
015 *
016 * @since 4.5
017 */
018public final class JUnit4 extends BlockJUnit4ClassRunner {
019    /**
020     * Constructs a new instance of the default runner
021     */
022    public JUnit4(Class<?> klass) throws InitializationError {
023        super(new TestClass(klass));
024    }
025}