package org.junit.tests.experimental.rules;
   
   import static org.junit.Assert.assertEquals;
   import static org.junit.Assert.assertThat;
   import static org.junit.experimental.results.PrintableResult.testResult;
   import static org.junit.experimental.results.ResultMatchers.isSuccessful;
   
   import org.junit.Rule;
   import org.junit.Test;
  import org.junit.rules.ExternalResource;
  
  public class ExternalResourceRuleTest {
      private static String callSequence;
  
      public static class UsesExternalResource {
          @Rule
          public ExternalResource resource = new ExternalResource() {
              @Override
              protected void before() throws Throwable {
                  callSequence += "before ";
              }
  
              ;
  
              @Override
              protected void after() {
                  callSequence += "after ";
              }
  
              ;
          };
  
          @Test
          public void testFoo() {
              callSequence += "test ";
          }
      }
  
      @Test
      public void externalResourceGeneratesCorrectSequence() {
          callSequence = "";
          assertThat(testResult(UsesExternalResource.class), isSuccessful());
          assertEquals("before test after ", callSequence);
      }
  }