Blog API Tests

Write tests for a Django blog API. The app has the following models:

• Post: title (CharField), body (TextField), author (ForeignKey to User), created_at (DateTimeField auto_now_add), published (BooleanField default=False)
• Comment: post (ForeignKey to Post), author (ForeignKey to User), body (TextField), created_at (DateTimeField auto_now_add)
• Tag: name (CharField unique) with a ManyToManyField on Post called tags

The API exposes these endpoints via Django REST Framework:

• GET /api/posts/ -- list published posts with their tags (paginated)
• POST /api/posts/ -- create a new post (authenticated)
• GET /api/posts/<id>/ -- retrieve a single post
• PUT /api/posts/<id>/ -- update a post (author only)
• DELETE /api/posts/<id>/ -- delete a post (author only)
• GET /api/posts/<id>/comments/ -- list comments for a post
• POST /api/posts/<id>/comments/ -- add a comment (authenticated)
• GET /api/tags/ -- list all tags

Output

Produce a test file at blog/tests/test_blog_api.py with comprehensive test coverage for the above endpoints. Include any supporting factory files you need. Assume the models and views already exist; you are only writing the tests.