CODEWITHSUNDEEP
javajunit4
Rajat Krishnan
Rajat Krishnan

Reputation: 111

Calling static method in test class(Junit)

I am writing junit test cases for my project but i am facing one problem Here is a method that i am using in one of my java class (GraphNodes.java)

 public static ArrayList<String> getCSList() {
    System.out.println(CSList.size()); // Output : 3
    return CSList; // returns 3 elements in list
}

Now here is my test class for Junit

@Test
public void checkCSListCount(){

 int actual= GraphNodes.getCSList().size(); // My exceptation here is 3 but in console it shows 0
 int excepted = 3;
 assertEquals(excepted,actual);  
 }

My junit is failing by saying excepted<3> but actual<0> Also i cannot change the static method to only public because it will affect some functionality of the code and since i am new to junit, i am not getting idea how to fix this.so can anyone help me out here Thanks in Advance!!

Upvotes: 1

Views: 1453

Answers (2)

Patrick Santana
Patrick Santana

Reputation: 417

You need to validate how you populate the object CSList() during runtime and do exactly the same when you are running the test.

One option is to have a @BeforeEach method in your test where it will set the values of what you need during the test.

    @BeforeEach
    public void setUp() {
       GraphNodes.setCSList(Arrays.asList("A","B","C"));
    }


   @Test
   public void checkCSListCount(){

      int actual= GraphNodes.getCSList().size();
      int excepted = 3;
      assertEquals(excepted,actual);  
  }

Upvotes: 1

Garuno
Garuno

Reputation: 2200

I think you are trying to write an integration test. So you should call the method, that fills the list with your 3 elements, before checking the list size. If all the logic for that is in your main method you should extract it into its own method.

Upvotes: 0

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