[1.5.X] Corrected tests depending on the error message on the AuthenticationForm.

Refs #19368, and the fix introduced in 27f8129d64.

Backport of 9facca28b6 from trunk.

django/contrib/auth/tests/forms.py

@@ -100,7 +100,9 @@ class AuthenticationFormTest(TestCase):
         form = AuthenticationForm(None, data)
         self.assertFalse(form.is_valid())
         self.assertEqual(form.non_field_errors(),
-                         [force_text(form.error_messages['invalid_login'])])
+                [force_text(form.error_messages['invalid_login'] % {
+                   'username': User._meta.get_field('username').verbose_name
+                })])
 
     def test_inactive_user(self):
         # The user is inactive.

django/contrib/auth/tests/views.py

@@ -248,7 +248,9 @@ class ChangePasswordTest(AuthViewsTestCase):
             'username': 'testclient',
             'password': password,
         })
-        self.assertContainsEscaped(response, AuthenticationForm.error_messages['invalid_login'])
+        self.assertContainsEscaped(response, AuthenticationForm.error_messages['invalid_login'] % {
+                'username': User._meta.get_field('username').verbose_name
+            })
 
     def logout(self):
         response = self.client.get('/logout/')

tests/regressiontests/admin_views/tests.py

@@ -51,7 +51,7 @@ from .models import (Article, BarAccount, CustomArticle, EmptyModel, FooAccount,
 
 
 ERROR_MESSAGE = "Please enter the correct username and password \
-for a staff account. Note that both fields are case-sensitive."
+for a staff account. Note that both fields may be case-sensitive."
 
 
 @override_settings(PASSWORD_HASHERS=('django.contrib.auth.hashers.SHA1PasswordHasher',))