There are different kinds of tests. However, at the minimum, a programmers need to know unit tests since they have to be able to write them. Unit testing checks the smallest testable part of an application. Integration testing checks whether these parts work well with each other.

The word unit is the key term here. Just test one unit at a time. Let's take a look at a simple example of a test case:

# tests.py
from django.test import TestCase
from django.core.urlresolvers import resolve
from .views import HomeView
class HomePageOpenTestCase(TestCase):
    def test_home_page_resolves(self):
        view = resolve('/')
        self.assertEqual(view.func.__name__,
                         HomeView.as_view().__name__)

This is a simple test that checks whether, when a user visits the root of our website's domain, they are correctly taken to the home page view. Like most good tests, it has a long and self-descriptive name. The test simply uses Django's resolve() function to match...