Pragmatic Unit Testing in Java 8 with JUnit/

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Initializing Tests with @Before Methods

Initializing Tests with @Before Methods

We will learn the importance of initializing and refactoring tests with @Before Methods.

We'll cover the following...

The @Before annotation is used to denote methods when we need to execute some common code before running a test. The first thing to look at is the common initialization code in all (both) of the tests in ProfileTest.

If both tests have the same logic, we can move that common logic into an @Before method. That way, each JUnit first executes code in any methods marked with the @Before annotation.

package iloveyouboss;

import org.junit.*;
import static org.junit.Assert.*;

public class ProfileTest {
   private Profile profile;
   private BooleanQuestion question;
   private Criteria criteria;
   
   @Before
   public void create() {
      profile = new Profile("Bull Hockey, Inc.");
      question = new BooleanQuestion(1, "Got bonuses?");
      criteria = new Criteria();
   }

   @Test
   public void matchAnswersFalseWhenMustMatchCriteriaNotMet() {
      Answer profileAnswer = new Answer(question, Bool.FALSE);
      profile.add(profileAnswer);      
      Answer criteriaAnswer = new Answer(question, Bool.TRUE);
      Criterion criterion = new Criterion(criteriaAnswer, Weight.MustMatch);
      criteria.add(criterion);

      boolean matches = profile.matches(criteria);
      
      assertFalse(matches);
   }
   
   @Test
   public void matchAnswersTrueForAnyDontCareCriteria() {
      Answer profileAnswer = new Answer(question, Bool.FALSE);
      profile.add(profileAnswer);      
      Answer criteriaAnswer = new Answer(question, Bool.TRUE);
      Criterion criterion = new Criterion(criteriaAnswer, Weight.DontCare);
      criteria.add(criterion);

      boolean matches = profile.matches(criteria);
      
      assertTrue(matches);
   }
}
Tests for profile class

The OK (2 tests) result shows that our tests are passing. ...