Junit test case for void methods

Question

I am writing Junit test cases for the following method. The Junit test case is below it. I can't seem to figure out what to test or how to?

//method
package try.out;
public class MyString implements MyStringInterface{
    public static String str;   
    public void removeChar(char C){

        str = MyString.str.replace("C", "");
        System.out.println(str);
    }

//testcase. 
@Test
public void testremoveChar() {
    MyString test = new MyString();
    //what do i do next?
}

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score 1 · Answer 1 · answered Sep 05 '14 at 22:19

The implementation of removeChar is probably wrong, but that's why you're writing a test no?

I would write

@Test
public void testremoveChar() {
    MyString test = new MyString();
    MyString.str = "This is a Complete Test";
    test.removeChar('T');
    assertEquals("his is a Complete est", MyString.str);
}

It will fail, but looking at the output you can improve the method until you get what expected.

Junit test case for void methods

1 Answers1