1 package org.junit.rules; 2 3 import org.junit.Rule; 4 import org.junit.runners.model.FrameworkMethod; 5 import org.junit.runners.model.Statement; 6 7 /** 8 * A MethodRule is an alteration in how a test method is run and reported. 9 * Multiple {@link MethodRule}s can be applied to a test method. The 10 * {@link Statement} that executes the method is passed to each annotated 11 * {@link Rule} in turn, and each may return a substitute or modified 12 * {@link Statement}, which is passed to the next {@link Rule}, if any. For 13 * examples of how this can be useful, see these provided MethodRules, 14 * or write your own: 15 * 16 * <ul> 17 * <li>{@link ErrorCollector}: collect multiple errors in one test method</li> 18 * <li>{@link ExpectedException}: make flexible assertions about thrown exceptions</li> 19 * <li>{@link ExternalResource}: start and stop a server, for example</li> 20 * <li>{@link TemporaryFolder}: create fresh files, and delete after test</li> 21 * <li>{@link TestName}: remember the test name for use during the method</li> 22 * <li>{@link TestWatchman}: add logic at events during method execution</li> 23 * <li>{@link Timeout}: cause test to fail after a set time</li> 24 * <li>{@link Verifier}: fail test if object state ends up incorrect</li> 25 * </ul> 26 */ 27 @Deprecated 28 public interface MethodRule { 29 /** 30 * Modifies the method-running {@link Statement} to implement an additional 31 * test-running rule. 32 * 33 * @param base The {@link Statement} to be modified 34 * @param method The method to be run 35 * @param target The object on with the method will be run. 36 * @return a new statement, which may be the same as {@code base}, 37 * a wrapper around {@code base}, or a completely new Statement. 38 */ apply(Statement base, FrameworkMethod method, Object target)39 Statement apply(Statement base, FrameworkMethod method, Object target); 40 }