JUnit: @Before only for some test methods?

Question

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?

Answer 1

Just move out the tests that don't need the setup code into a separate test class. If you have some other code common to the tests that would be helpful to keep, move that out into a helper class.

Answer 2

@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