Moved LogEntry-related tests to their own test case

Thanks Tim Graham for reviewing and contributing to the patch.
Refs #21113.

tests/admin_utils/tests.py

@@ -5,7 +5,6 @@ from decimal import Decimal
 
 from django import forms
 from django.conf import settings
-from django.contrib import admin
 from django.contrib.admin import helpers
 from django.contrib.admin.utils import (
     NestedObjects, display_for_field, flatten, flatten_fieldsets,
@@ -13,7 +12,6 @@ from django.contrib.admin.utils import (
 )
 from django.db import DEFAULT_DB_ALIAS, models
 from django.test import SimpleTestCase, TestCase, override_settings
-from django.utils import six
 from django.utils.formats import localize
 from django.utils.safestring import mark_safe
 
@@ -303,31 +301,6 @@ class UtilsTests(SimpleTestCase):
             ('awesome guest', None),
         )
 
-    def test_logentry_unicode(self):
-        """
-        Regression test for #15661
-        """
-        log_entry = admin.models.LogEntry()
-
-        log_entry.action_flag = admin.models.ADDITION
-        self.assertTrue(
-            six.text_type(log_entry).startswith('Added ')
-        )
-
-        log_entry.action_flag = admin.models.CHANGE
-        self.assertTrue(
-            six.text_type(log_entry).startswith('Changed ')
-        )
-
-        log_entry.action_flag = admin.models.DELETION
-        self.assertTrue(
-            six.text_type(log_entry).startswith('Deleted ')
-        )
-
-        # Make sure custom action_flags works
-        log_entry.action_flag = 4
-        self.assertEqual(six.text_type(log_entry), 'LogEntry Object')
-
     def test_safestring_in_field_label(self):
         # safestring should not be escaped
         class MyForm(forms.Form):