A simple vanilla JUnit example.

blog-junit-climber.java

public class ClimberTest {
    private climber;
    @Before
    void setup() {
        climber = new Climber();
    }

    @Test
    public void testHasRopeWithRope() {
        climber.setRope(new SterlingRope());
        assertTrue(climber.hasRope());
    }

    @Test
    public void testHasRopeNoRope() {
        assertFalse(climber.hasRope());
    }
}