Spring錯誤——Junit測試——Test class should have exactly one public constructor

• 背景：Spring 構建單元測試
• 錯誤

  java.lang.Exception: Test class should have exactly one public constructor
  
      at org.junit.runners.BlockJUnit4ClassRunner.validateOnlyOneConstructor(BlockJUnit4ClassRunner.java:131)
      at org.junit.runners.BlockJUnit4ClassRunner.validateConstructor(BlockJUnit4ClassRunner.java:120)
      at org.junit.runners.BlockJUnit4ClassRunner.collectInitializationErrors(BlockJUnit4ClassRunner.java:101)
      at org.junit.runners.ParentRunner.validate(ParentRunner.java:344)
      at org.junit.runners.ParentRunner.<init>(ParentRunner.java:74)
      at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:55)
      at org.junit.internal.builders.JUnit4Builder.runnerForClass(JUnit4Builder.java:13)

• 錯誤原因：在Junit測試類中必須聲明一個public 構造函數。我的測試類沒有聲明public，默認為default 。

  public class TestBeanScope extends UnitTestBase {
  
      TestBeanScope(){
          super("classpath*:spring-scope.xml");
      }
  
      @Test
      public void  TestSingleton(){
          for (int i=0;i<3;i++){
              BeanScope beanScope = (BeanScope)super.getBean("beanScope");
              beanScope.say("test");
          }
      }
  }

• 解決辦法：構建一個公有構造函數即可

  public class TestBeanScope extends UnitTestBase {
  
      public TestBeanScope(){
          super("classpath*:spring-scope.xml");
      }
  
      @Test
      public void  TestSingleton(){
          for (int i=0;i<3;i++){
              BeanScope beanScope = (BeanScope)super.getBean("beanScope");
              beanScope.say("test");
          }
      }
  }

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