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Pragmatic Unit Testing in Java 8 with JUnit

Expanding the Interface

Explore how to expand interfaces in Java unit testing by passing Criteria objects to methods. Understand the role of incremental test-driven development, refactoring for cleaner code, and handling special cases in test design. This lesson guides you through maintaining short TDD cycles and improving test readability while managing complex conditions.

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We’re now ready to open up our interface and support passing a Criteria object to matches(). The next test sets the stage for creating that interface:

package iloveyouboss;

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

public class ProfileTest {
   private Profile profile;
   private BooleanQuestion questionIsThereRelocation;
   private Answer answerThereIsRelocation;
   private Answer answerThereIsNotRelocation;
   private BooleanQuestion questionReimbursesTuition;
   private Answer answerDoesNotReimburseTuition;
   private Answer answerReimbursesTuition;

   @Before
   public void createProfile() {
      profile = new Profile();
   }
   
   @Before
   public void createQuestionsAndAnswers() {
      questionIsThereRelocation = 
            new BooleanQuestion(1, "Relocation package?");
      answerThereIsRelocation = 
            new Answer(questionIsThereRelocation, Bool.TRUE);
      answerThereIsNotRelocation = 
            new Answer(questionIsThereRelocation, Bool.FALSE);

      questionReimbursesTuition = new BooleanQuestion(1, "Reimburses tuition?");
      answerDoesNotReimburseTuition = 
         new Answer(questionReimbursesTuition, Bool.FALSE);
      answerReimbursesTuition = 
         new Answer(questionReimbursesTuition, Bool.TRUE);
   }

   @Test
   public void doesNotMatchWhenNoneOfMultipleCriteriaMatch() {
      profile.add(answerDoesNotReimburseTuition);
      Criteria criteria = new Criteria();
      criteria.add(new Criterion(answerThereIsRelocation, Weight.Important));
      criteria.add(new Criterion(answerReimbursesTuition, Weight.Important));
      
      boolean result = profile.matches(criteria);
      
      assertFalse(result);
   }
}
ProfileTest.java

A simple hardcoded return gets the test to pass in the Profile class:

public boolean
...