test_view_password_change.py

from django.contrib.auth.forms import PasswordChangeForm
from django.contrib.auth.models import User
from django.contrib.auth import views as auth_views
from django.core.urlresolvers import reverse
from django.urls import resolve
from django.test import TestCase


class PasswordChangeTests(TestCase):
    def setUp(self):
        username = 'john'
        password = 'secret123'
        user = User.objects.create_user(username=username, email='john@doe.com', password=password)
        url = reverse('password_change')
        self.client.login(username=username, password=password)
        self.response = self.client.get(url)

    def test_status_code(self):
        self.assertEquals(self.response.status_code, 200)

    def test_url_resolves_correct_view(self):
        view = resolve('/settings/password/')
        self.assertEquals(view.func.view_class, auth_views.PasswordChangeView)

    def test_csrf(self):
        self.assertContains(self.response, 'csrfmiddlewaretoken')

    def test_contains_form(self):
        form = self.response.context.get('form')
        self.assertIsInstance(form, PasswordChangeForm)

    def test_form_inputs(self):
        '''
        The view must contain four inputs: csrf, old_password, new_password1, new_password2
        '''
        self.assertContains(self.response, '<input', 4)
        self.assertContains(self.response, 'type="password"', 3)


class LoginRequiredPasswordChangeTests(TestCase):
    def test_redirection(self):
        url = reverse('password_change')
        login_url = reverse('login')
        response = self.client.get(url)
        self.assertRedirects(response, f'{login_url}?next={url}')


class PasswordChangeTestCase(TestCase):
    '''
    Base test case for form processing
    accepts a `data` dict to POST to the view.
    '''
    def setUp(self, data={}):
        self.user = User.objects.create_user(username='john', email='john@doe.com', password='old_password')
        self.url = reverse('password_change')
        self.client.login(username='john', password='old_password')
        self.response = self.client.post(self.url, data)


class SuccessfulPasswordChangeTests(PasswordChangeTestCase):
    def setUp(self):
        super().setUp({
            'old_password': 'old_password',
            'new_password1': 'new_password',
            'new_password2': 'new_password',
        })

    def test_redirection(self):
        '''
        A valid form submission should redirect the user
        '''
        self.assertRedirects(self.response, reverse('password_change_done'))

    def test_password_changed(self):
        '''
        refresh the user instance from database to get the new password
        hash updated by the change password view.
        '''
        self.user.refresh_from_db()
        self.assertTrue(self.user.check_password('new_password'))

    def test_user_authentication(self):
        '''
        Create a new request to an arbitrary page.
        The resulting response should now have an `user` to its context, after a successful sign up.
        '''
        response = self.client.get(reverse('home'))
        user = response.context.get('user')
        self.assertTrue(user.is_authenticated)


class InvalidPasswordChangeTests(PasswordChangeTestCase):
    def test_status_code(self):
        '''
        An invalid form submission should return to the same page
        '''
        self.assertEquals(self.response.status_code, 200)

    def test_form_errors(self):
        form = self.response.context.get('form')
        self.assertTrue(form.errors)

    def test_didnt_change_password(self):
        '''
        refresh the user instance from the database to make
        sure we have the latest data.
        '''
        self.user.refresh_from_db()
        self.assertTrue(self.user.check_password('old_password'))

i have this error that i cant seem to solve can somone plz help me

Traceback (most recent call last):
File "C:\Users\T-chris\myproject\myproject\next\test\test_views.py", line 33, in test_board_topics_view_contains_link_back_to_homepage
self.assertContains(response,'href="{0}"'.format(homepage_url))
File "C:\Users\T-chris\Envs\final\lib\site-packages\django\test\testcases.py", line 445, in assertContains
text_repr, real_count, msg_prefix = self._assert_contains(
File "C:\Users\T-chris\Envs\final\lib\site-packages\django\test\testcases.py", line 415, in _assert_contains
self.assertEqual(
AssertionError: 404 != 200 : Couldn't retrieve content: Response code was 404 (expected 200)

======================================================================
FAIL: test_board_topics_view_contains_navigation_links (next.test.test_views.BoardTopicsTests)

Traceback (most recent call last):
File "C:\Users\T-chris\myproject\myproject\next\test\test_views.py", line 42, in test_board_topics_view_contains_navigation_links
self.assertContains(response, 'href="{0}"'.format(homepage_url))
File "C:\Users\T-chris\Envs\final\lib\site-packages\django\test\testcases.py", line 445, in assertContains
text_repr, real_count, msg_prefix = self._assert_contains(
File "C:\Users\T-chris\Envs\final\lib\site-packages\django\test\testcases.py", line 415, in _assert_contains
self.assertEqual(
AssertionError: 404 != 200 : Couldn't retrieve content: Response code was 404 (expected 200)