test: Identify bug and test views

resolved #24

- 모델 날짜 버그 (날짜가 미래로 설정되어 있는데 '최근'으로 표시되는
  현상) 테스트
- 모델 버그 수정 및 기능 추가 후 테스트
- 장고 테스트 클라이언트 사용
- 설문조사 목록에 아직 게시되지 않은 설문조사가 표시되는 버그 테스트
- 뷰 수정 및 디테일 뷰 제약조건 추가 후 테스트

Author: devpla

mysite/polls/tests.py

@@ -2,6 +2,7 @@
 
 from django.test import TestCase
 from django.utils import timezone
+from django.urls import reverse
 
 from .models import Question
 
@@ -35,3 +36,93 @@ def test_was_published_recently_with_recent_question(self):
         time = timezone.now() - datetime.timedelta(hours=23, minutes=59, seconds=59)
         recent_question = Question(pub_date=time)
         self.assertIs(recent_question.was_published_recently(), True)
+
+
+def create_question(question_text, days):
+    """
+    Create a question with the given `question_text` and published the
+    given number of `days` offset to now (negative for questions published
+    in the past, positive for questions that have yet to be published).
+    """
+    time = timezone.now() + datetime.timedelta(days=days)
+    return Question.objects.create(question_text=question_text, pub_date=time)
+
+
+class QuestionIndexViewTests(TestCase):
+    def test_no_questions(self):
+        """
+        If no questions exist, an appropriate message is displayed.
+        """
+        response = self.client.get(reverse('polls:index'))
+        self.assertEqual(response.status_code, 200)
+        self.assertContains(response, "No polls are available.")
+        self.assertQuerysetEqual(response.context['latest_question_list'], [])
+
+    def test_past_question(self):
+        """
+        Questions with a pub_date in the past are displayed on the
+        index page.
+        """
+        question = create_question(question_text="Past question.", days=-30)
+        response = self.client.get(reverse('polls:index'))
+        self.assertQuerysetEqual(
+            response.context['latest_question_list'],
+            [question],
+        )
+
+    def test_future_question(self):
+        """
+        Questions with a pub_date in the future aren't displayed on
+        the index page.
+        """
+        create_question(question_text="Future question.", days=30)
+        response = self.client.get(reverse('polls:index'))
+        self.assertContains(response, "No polls are available.")
+        self.assertQuerysetEqual(response.context['latest_question_list'], [])
+
+    def test_future_question_and_past_question(self):
+        """
+        Even if both past and future questions exist, only past questions
+        are displayed.
+        """
+        question = create_question(question_text="Past question.", days=-30)
+        create_question(question_text="Future question.", days=30)
+        response = self.client.get(reverse('polls:index'))
+        self.assertQuerysetEqual(
+            response.context['latest_question_list'],
+            [question],
+        )
+
+    def test_two_past_questions(self):
+        """
+        The questions index page may display multiple questions.
+        """
+        question1 = create_question(question_text="Past question 1.", days=-30)
+        question2 = create_question(question_text="Past question 2.", days=-5)
+        response = self.client.get(reverse('polls:index'))
+        self.assertQuerysetEqual(
+            response.context['latest_question_list'],
+            [question2, question1],
+        )
+
+
+class QuestionDetailViewTests(TestCase):
+    def test_future_question(self):
+        """
+        The detail view of a question with a pub_date in the future
+        returns a 404 not found.
+        """
+        future_question = create_question(question_text='Future question.', days=5)
+        url = reverse('polls:detail', args=(future_question.id,))
+        response = self.client.get(url)
+        self.assertEqual(response.status_code, 404)
+
+    def test_past_question(self):
+        """
+        The detail view of a question with a pub_date in the past
+        displays the question's text.
+        """
+        past_question = create_question(question_text='Past Question.', days=-5)
+        url = reverse('polls:detail', args=(past_question.id,))
+        response = self.client.get(url)
+        self.assertContains(response, past_question.question_text)