我想记录我的 JUnit 测试以编程方式运行需要多长时间。我在各种测试类中有大量测试，我想找出每个单独的测试方法运行需要多长时间。

我可以更改继承结构或以不同方式注释方法，但我想避免在测试方法本身以及用于设置测试业务逻辑的之前/之后方法中添加代码。

最佳答案

您可以使用 JUnit StopWatch 规则并覆盖 JUnit API 文档中提供的方法，只需在每个单独的测试用例类中包含一行代码，即可将时间打印到每个测试的控制台或日志文件中。

1. 创建您的客户秒表类(提供示例)

   import java.util.concurrent.TimeUnit;
   import org.junit.AssumptionViolatedException;
   import org.junit.rules.Stopwatch;
   import org.junit.runner.Description;
   
   public class MyJUnitStopWatch extends Stopwatch{
   
   private static void logInfo(Description description, String status, long nanos) {
       String testName = description.getMethodName();
       System.out.println(String.format("Test %s %s, spent %d microseconds",
                                 testName, status, TimeUnit.NANOSECONDS.toMicros(nanos)));
   }
   
    @Override
      protected void succeeded(long nanos, Description description) {
          logInfo(description, "succeeded", nanos);
      }
   
      @Override
      protected void failed(long nanos, Throwable e, Description description) {
          logInfo(description, "failed", nanos);
      }
   
      @Override
      protected void skipped(long nanos, AssumptionViolatedException e, Description description) {
          logInfo(description, "skipped", nanos);
      }
   
      @Override
      protected void finished(long nanos, Description description) {
          logInfo(description, "finished", nanos);
      }    
   }
   

2. 使用该行创建一个 ParentTestClass，并且您的每个测试类都继承父测试类:

   public class ParentTestCase {
   
   
   @Rule
   public MyJUnitStopWatch stopwatch = new MyJUnitStopWatch();
   
   }
   

子类继承父类。子类或方法之前或之后没有其他变化。

public class TestUniqueCharacterString extends ParentTestCase {    

    private String uniqueChars = null;

    @Before
    public void before(){
        uniqueChars = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnop";
    }

    @Test
    public void testMyUniqueCharacterMethod(){


        UniqueCharacteString.doesStringHaveUniqueCharacters(uniqueChars);
    }

或者

1. 在您的每个测试类中包含这一行

   @Rule
   public MyJUnitStopWatch stopwatch = new MyJUnitStopWatch();
   

   示例测试类:

   import org.junit.After;
   import org.junit.Before;
   import org.junit.Rule;
   import org.junit.Test;
   
   
   
   public class TestUniqueCharacterString {    
   
   @Rule
   public MyJUnitStopWatch stopwatch = new MyJUnitStopWatch();
   
   private String uniqueChars = null;
   
   @Before
   public void before(){
       uniqueChars = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnop";
   }
   
   @Test
   public void testMyUniqueCharacterMethod(){
   
   
       UniqueCharacteString.doesStringHaveUniqueCharacters(uniqueChars);
   }
   
   @Test
   public void testGoodIsUniqueMethod(){
           UniqueCharacteString.isUniqueCharacs(uniqueChars);
   }
   
   @Test
   public void testGoodIsUniqueMethodWithoutArray(){
       UniqueCharacteString.isUniqueCharsWithoutArray(uniqueChars);
   }
   
   @After
   public void after(){
       uniqueChars = "";
   }    
    }
   

JUnit API 引用:

http://junit.org/apidocs/org/junit/rules/Stopwatch.html

示例输出

Test testMyUniqueCharacterMethod succeeded, spent 3250 microseconds
Test testMyUniqueCharacterMethod finished, spent 3250 microseconds
Test testGoodIsUniqueMethod succeeded, spent 70 microseconds
Test testGoodIsUniqueMethod finished, spent 70 microseconds
Test testGoodIsUniqueMethodWithoutArray succeeded, spent 54 microseconds
Test testGoodIsUniqueMethodWithoutArray finished, spent 54 microseconds

它还会显示失败和跳过的测试用例的时间。

关于java - 记录运行 JUnit 测试所需的时间，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/17552779/