Improve Documentation about setUp and tearDown for tests

[infyloop]

Currently the documentation does not talk of how setUp and tearDown methods for classes work. If possible, include optimization of setUp and tearDown as well.

A simple example would be as follows:

class BookModelTest(TestCase):

     def setUp(self):
          self.author = G(Author)
          self.book = G(Book, author=[author])

     def test_book_creation(self):
          book_in_db = Book.objects.all()
          self.assertEquals(book_in_db.count(), 1)
          first_book = book_in_db[0]
          self.assertEquals(first_book.name, self.book.name)
          self.assertEquals(list(first_book.author), [self.author])

class Author(models.Model):

     name = models.CharField(max_length=100)

class Book(models.Model):

     name = models.CharField(max_length=100)
     author = models.ManyToManyField(Author)

[tobych]

That should be:

def setUp(self):
    self.author = G(Author)
    self.book = G(Book, author=[author])

:-)

[infyloop]

thanks, corrected :-)

[paulocheque]

DDF help to decrease the number of lines in setUp methods. A good unit test is a cohesive test. Avoid spread information of the test in many methods/classes.

PS: Django test suite let the tearDown method pratically useless. Just in very special scenarios it will be useful. DDF FileSystemTestCase has the same reason to exist.