001    package org.junit.rules;
002    
003    import org.junit.Rule;
004    import org.junit.runners.model.FrameworkMethod;
005    import org.junit.runners.model.Statement;
006    
007    /**
008     * A MethodRule is an alteration in how a test method is run and reported.
009     * Multiple {@link MethodRule}s can be applied to a test method. The
010     * {@link Statement} that executes the method is passed to each annotated
011     * {@link Rule} in turn, and each may return a substitute or modified
012     * {@link Statement}, which is passed to the next {@link Rule}, if any. For
013     * an example of how this can be useful, see {@link TestWatchman}.
014     *
015     * <p>Note that {@link MethodRule} has been replaced by {@link TestRule},
016     * which has the added benefit of supporting class rules.
017     *
018     * @since 4.7
019     */
020    public interface MethodRule {
021        /**
022         * Modifies the method-running {@link Statement} to implement an additional
023         * test-running rule.
024         *
025         * @param base The {@link Statement} to be modified
026         * @param method The method to be run
027         * @param target The object on which the method will be run.
028         * @return a new statement, which may be the same as {@code base},
029         *         a wrapper around {@code base}, or a completely new Statement.
030         */
031        Statement apply(Statement base, FrameworkMethod method, Object target);
032    }