JUnit: @Before only for some test methods?

user_147601 0
Viewed 71114

I have some common set up code that I've factored out to a method marked with @Before. However, it is not necessary for all this code to run for every single test. Is there a way to mark it so the @Before method only runs before certain tests?

junit unit-testing java
6 Answers

@Nested + @BeforeEach

Totally agree with the point of moving the related code to an inner class. So here what I have done.

  1. Create an inner class inside your test class
  2. Annotate the inner class with @Nested
  3. Move all the test methods you want to use in the inner class
  4. Write the init code inside the inner class and annotate it with @ForEach

Here is the code:

class Testing {

    @Test
    public void testextmethod1() {
    
      System.out.println("test ext method 1");
    
    }
    
    @Nested
    class TestNest{
    
       @BeforeEach
       public void init() {
          System.out.println("Init");
       }
    
       @Test
       public void testmethod1() {
          System.out.println("This is method 1");
       }
    
       @Test
       public void testmethod2() {
          System.out.println("This is method 2");
       }
    
       @Test
       public void testmethod3() {
          System.out.println("This is method 3");
       }
        
     }

     @Test
     public void testextmethod2() {
    
         System.out.println("test ext method 2");
    
     }

}

Here is the output

test ext method 1
test ext method 2
Init
This is method 1
Init
This is method 2
Init
This is method 3

Note: I am not sure if this is supported in Junit4. I am doing this in JUnit5

user_47001560

JUnit 4.12 provide Enclosed Runner like

@RunWith(Enclosed.class) 
public class GlobalTest{

    @RunWith(MockitoJUnitRunner.class)
    public class InnerTest{
    
    }

}
user_103302610
Related