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package org.junit.rules;

import org.junit.Rule;
import org.junit.runners.model.FrameworkMethod;
import org.junit.runners.model.Statement;

/**
 * A MethodRule is an alteration in how a test method is run and reported.
 * Multiple {@link MethodRule}s can be applied to a test method. The
 * {@link Statement} that executes the method is passed to each annotated
 * {@link Rule} in turn, and each may return a substitute or modified
 * {@link Statement}, which is passed to the next {@link Rule}, if any. For
 * examples of how this can be useful, see these provided MethodRules,
 * or write your own:
 *
 * 
    *
  • {@link ErrorCollector}: collect multiple errors in one test method
  • *
  • {@link ExpectedException}: make flexible assertions about thrown exceptions
  • *
  • {@link ExternalResource}: start and stop a server, for example
  • *
  • {@link TemporaryFolder}: create fresh files, and delete after test
  • *
  • {@link TestName}: remember the test name for use during the method
  • *
  • {@link TestWatchman}: add logic at events during method execution
  • *
  • {@link Timeout}: cause test to fail after a set time
  • *
  • {@link Verifier}: fail test if object state ends up incorrect
  • *
* * Note that {@link MethodRule} has been replaced by {@link TestRule}, * which has the added benefit of supporting class rules. * * @since 4.7 */ public interface MethodRule { /** * Modifies the method-running {@link Statement} to implement an additional * test-running rule. * * @param base The {@link Statement} to be modified * @param method The method to be run * @param target The object on which the method will be run. * @return a new statement, which may be the same as {@code base}, * a wrapper around {@code base}, or a completely new Statement. */ Statement apply(Statement base, FrameworkMethod method, Object target); }




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