Pragmatic Unit Testing in Java 8 with JUnit/

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Testing Databases

Testing Databases

Learn how to write tests in order to test databases.

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We were able to refactor this class so that most of its code doesn’t directly interact with a QuestionController instance, which in turn lets us write fast tests for the bulk of its logic. We were left with one method, questionText(), that interacts with a controller object. Let’s test that method:

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public Map<Integer,String> questionText(List<BooleanAnswer> answers) {
  Map<Integer,String> questions = new HashMap<>();
  answers.stream().forEach(answer -> {
      if (!questions.containsKey(answer.getQuestionId()))
        questions.put(answer.getQuestionId(), 
            controller.find(answer.getQuestionId()).getText()); });
  return questions;
}

The questionText() method takes a list of answer objects and returns a ...