DjangoでのPOSTのテスト

https://docs.djangoproject.com/ja/3.1/intro/tutorial05/#ideas-for-more-tests

Django公式チュートリアルの投票システムで、投票を実行した際のテストの記述を考える。

まず、新しいQuestionと、それに紐付く2件のChoiceを用意する。

 
# 新しい質問と回答を2つ準備
past_question = create_question(question_text='Past question.', days=-1)
past_choice_one = create_choice(choice_text='Choice 1', question=past_question)
past_choice_two = create_choice(choice_text='Choice 2', question=past_question)

まずは、単純にclient.postで、POSTデータを渡しつつURLを呼び出してみる。

 
url = reverse('polls:vote', args=(past_question.id,))

# status_code=302が返ってくる
response = self.client.post(url, {'choice' : past_choice_one.id})

この場合、レスポンスとしてはstatus_code=302が返って来る。

 
self.assertEqual(response.status_code, 302)
self.assertRedirects(
    response,
    reverse('polls:results', args=(past_question.id,)),
    status_code=302,
    target_status_code=200,
    msg_prefix='',
    fetch_redirect_response=True
)

つまり、リダイレクト前のページ情報が取得されている。

参考：【Django】テストでリダイレクト先のページを検証する方法

https://qiita.com/kozakura16/items/c08b8cb8da12ace78658

リダイレクト先のページ内容まで検証する際は、client.post()メソッドの引数として、

follow=True

を渡してあげる。

 
# 最終的なリダイレクト先のページ情報が返ってくる
response = self.client.post(url, {'choice' : past_choice_one.id}, follow=True)

これにより、最終的にリダイレクトされたページがレスポンスに入るので、出力の検証コードが記述できるようになる。

 
self.assertEqual(response.status_code, 200)
self.assertContains(response, 'Choice 1 -- 1 vote')
self.assertContains(response, 'Choice 2 -- 0 vote')
self.assertEqual(response.context['question'].question_text, 'Past question.')
self.assertQuerysetEqual(
response.context['question'].choice_set.all(),
    ['<Choice: Choice 1>', '<Choice: Choice 2>'],
    ordered=False
)

これは、公式ドキュメントの Testing Toolsページ内、getメソッドの項で触れられている。

https://docs.djangoproject.com/en/3.1/topics/testing/tools/#django.test.Client.get

テストの実行

https://docs.djangoproject.com/ja/3.1/intro/tutorial05/#running-tests

上記のDjangoの自動テストのチュートリアルにて、以下のコマンドを実行。

$ python manage.py test polls

実行後、下記のエラーメッセージが表示された。

 
$ python manage.py test polls
Creating test database for alias 'default'...
Traceback (most recent call last):
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/core/management/base.py", line 328, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/core/management/base.py", line 369, in execute
    output = self.handle(*args, **options)
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/core/management/commands/test.py", line 53, in handle
    failures = test_runner.run_tests(test_labels)
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/test/runner.py", line 684, in run_tests
    old_config = self.setup_databases(aliases=databases)
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/test/runner.py", line 604, in setup_databases
    return _setup_databases(
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/test/utils.py", line 169, in setup_databases
    connection.creation.create_test_db(
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/db/backends/base/creation.py", line 60, in create_test_db
    self.connection.close()
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/db/backends/sqlite3/base.py", line 261, in close
    if not self.is_in_memory_db():
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/db/backends/sqlite3/base.py", line 380, in is_in_memory_db
    return self.creation.is_in_memory_db(self.settings_dict['NAME'])
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/db/backends/sqlite3/creation.py", line 12, in is_in_memory_db
    return database_name == ':memory:' or 'mode=memory' in database_name
TypeError: argument of type 'PosixPath' is not iterable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "manage.py", line 22, in <module>
    main()
  File "manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line
    utility.execute()
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/core/management/__init__.py", line 395, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/core/management/commands/test.py", line 23, in run_from_argv
    super().run_from_argv(argv)
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/core/management/base.py", line 341, in run_from_argv
    connections.close_all()
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/db/utils.py", line 230, in close_all
    connection.close()
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/db/backends/sqlite3/base.py", line 261, in close
    if not self.is_in_memory_db():
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/db/backends/sqlite3/base.py", line 380, in is_in_memory_db
    return self.creation.is_in_memory_db(self.settings_dict['NAME'])
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/db/backends/sqlite3/creation.py", line 12, in is_in_memory_db
    return database_name == ':memory:' or 'mode=memory' in database_name
TypeError: argument of type 'PosixPath' is not iterable
MackBook-Pro-2013:mysite dev_user$
MackBook-Pro-2013:mysite dev_user$
MackBook-Pro-2013:mysite dev_user$ python manage.py test polls
Creating test database for alias 'default'...
Traceback (most recent call last):
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/core/management/base.py", line 328, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/core/management/base.py", line 369, in execute
    output = self.handle(*args, **options)
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/core/management/commands/test.py", line 53, in handle
    failures = test_runner.run_tests(test_labels)
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/test/runner.py", line 684, in run_tests
    old_config = self.setup_databases(aliases=databases)
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/test/runner.py", line 604, in setup_databases
    return _setup_databases(
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/test/utils.py", line 169, in setup_databases
    connection.creation.create_test_db(
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/db/backends/base/creation.py", line 60, in create_test_db
    self.connection.close()
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/db/backends/sqlite3/base.py", line 261, in close
    if not self.is_in_memory_db():
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/db/backends/sqlite3/base.py", line 380, in is_in_memory_db
    return self.creation.is_in_memory_db(self.settings_dict['NAME'])
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/db/backends/sqlite3/creation.py", line 12, in is_in_memory_db
    return database_name == ':memory:' or 'mode=memory' in database_name
TypeError: argument of type 'PosixPath' is not iterable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "manage.py", line 22, in <module>
    main()
  File "manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line
    utility.execute()
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/core/management/__init__.py", line 395, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/core/management/commands/test.py", line 23, in run_from_argv
    super().run_from_argv(argv)
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/core/management/base.py", line 341, in run_from_argv
    connections.close_all()
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/db/utils.py", line 230, in close_all
    connection.close()
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/db/backends/sqlite3/base.py", line 261, in close
    if not self.is_in_memory_db():
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/db/backends/sqlite3/base.py", line 380, in is_in_memory_db
    return self.creation.is_in_memory_db(self.settings_dict['NAME'])
  File "/Users/dev_user/.pyenv/versions/3.8.3/lib/python3.8/site-packages/django/db/backends/sqlite3/creation.py", line 12, in is_in_memory_db
    return database_name == ':memory:' or 'mode=memory' in database_name
TypeError: argument of type 'PosixPath' is not iterable

修正箇所は、「/mysite/settings.py」のDATABASES設定内。

'NAME': BASE_DIR / 'db.sqlite3',

↓

'NAME': str( BASE_DIR / 'db.sqlite3' ),

os.pathの方を使えばこのエラーは起きなさそう。

参考サイト

Fixed #29983 -- Replaced os.path with pathlib.Path. #10684

https://github.com/django/django/pull/10684

How to use pathlib.Path in Django?

https://github.com/django/django/pull/10684

Django tutorial: `python manage.py startapp polls` fails

https://forum.djangoproject.com/t/django-tutorial-python-manage-py-startapp-polls-fails/2718

hiroinagi's blog

2020年9月23日水曜日

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2020年9月20日日曜日

Djangoチュートリアル5での投票機能のテスト

DjangoでのPOSTのテスト

2020年9月10日木曜日

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参考サイト

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