Use assertIsInstance in tests.

Gives much nicer errors when it fails.

tests/admin_views/tests.py

@@ -1995,7 +1995,7 @@ class AdminViewListEditable(TestCase):
         }
         response = self.client.post('/test_admin/admin/admin_views/person/', data)
         non_form_errors = response.context['cl'].formset.non_form_errors()
-        self.assertTrue(isinstance(non_form_errors, ErrorList))
+        self.assertIsInstance(non_form_errors, ErrorList)
         self.assertEqual(str(non_form_errors), str(ErrorList(["Grace is not a Zombie"])))
 
     def test_list_editable_ordering(self):

tests/backends/tests.py

@@ -172,7 +172,7 @@ class LastExecutedQueryTest(TestCase):
         sql, params = persons.query.sql_with_params()
         cursor = persons.query.get_compiler('default').execute_sql(None)
         last_sql = cursor.db.ops.last_executed_query(cursor, sql, params)
-        self.assertTrue(isinstance(last_sql, six.text_type))
+        self.assertIsInstance(last_sql, six.text_type)
 
     @unittest.skipUnless(connection.vendor == 'sqlite',
                          "This test is specific to SQLite.")

tests/basic/tests.py

@@ -432,7 +432,7 @@ class ModelTest(TestCase):
             Article.objects.all()[0:-5]
         except Exception as e:
             error = e
-        self.assertTrue(isinstance(error, AssertionError))
+        self.assertIsInstance(error, AssertionError)
         self.assertEqual(str(error), "Negative indexing is not supported.")
 
         # An Article instance doesn't have access to the "objects" attribute.
@@ -637,15 +637,15 @@ class ModelTest(TestCase):
         # Can't be instantiated
         with self.assertRaises(TypeError):
             EmptyQuerySet()
-        self.assertTrue(isinstance(Article.objects.none(), EmptyQuerySet))
+        self.assertIsInstance(Article.objects.none(), EmptyQuerySet)
 
     def test_emptyqs_values(self):
         # test for #15959
         Article.objects.create(headline='foo', pub_date=datetime.now())
         with self.assertNumQueries(0):
             qs = Article.objects.none().values_list('pk')
-            self.assertTrue(isinstance(qs, EmptyQuerySet))
+            self.assertIsInstance(qs, EmptyQuerySet)
-            self.assertTrue(isinstance(qs, ValuesListQuerySet))
+            self.assertIsInstance(qs, ValuesListQuerySet)
             self.assertEqual(len(qs), 0)
 
     def test_emptyqs_customqs(self):
@@ -660,7 +660,7 @@ class ModelTest(TestCase):
         qs = qs.none()
         with self.assertNumQueries(0):
             self.assertEqual(len(qs), 0)
-            self.assertTrue(isinstance(qs, EmptyQuerySet))
+            self.assertIsInstance(qs, EmptyQuerySet)
             self.assertEqual(qs.do_something(), 'did something')
 
     def test_emptyqs_values_order(self):

tests/cache/tests.py

@@ -510,13 +510,13 @@ class BaseCacheTests(object):
                 # memcached does not allow whitespace or control characters in keys
                 self.cache.set('key with spaces', 'value')
                 self.assertEqual(len(w), 2)
-                self.assertTrue(isinstance(w[0].message, CacheKeyWarning))
+                self.assertIsInstance(w[0].message, CacheKeyWarning)
             with warnings.catch_warnings(record=True) as w:
                 warnings.simplefilter("always")
                 # memcached limits key length to 250
                 self.cache.set('a' * 251, 'value')
                 self.assertEqual(len(w), 1)
-                self.assertTrue(isinstance(w[0].message, CacheKeyWarning))
+                self.assertIsInstance(w[0].message, CacheKeyWarning)
         finally:
             self.cache.key_func = old_func
 
@@ -1097,10 +1097,10 @@ class GetCacheTests(unittest.TestCase):
     def test_simple(self):
         cache = get_cache('locmem://')
         from django.core.cache.backends.locmem import LocMemCache
-        self.assertTrue(isinstance(cache, LocMemCache))
+        self.assertIsInstance(cache, LocMemCache)
 
         from django.core.cache import cache
-        self.assertTrue(isinstance(cache, get_cache('default').__class__))
+        self.assertIsInstance(cache, get_cache('default').__class__)
 
         cache = get_cache(
             'django.core.cache.backends.dummy.DummyCache', **{'TIMEOUT': 120})

tests/comment_tests/tests/test_comment_form.py

@@ -54,7 +54,7 @@ class CommentFormTests(CommentTestCase):
     def testGetCommentObject(self):
         f = self.testValidPost()
         c = f.get_comment_object()
-        self.assertTrue(isinstance(c, Comment))
+        self.assertIsInstance(c, Comment)
         self.assertEqual(c.content_object, Article.objects.get(pk=1))
         self.assertEqual(c.comment, "This is my comment")
         c.save()

tests/comment_tests/tests/test_templatetags.py

@@ -32,7 +32,7 @@ class CommentTemplateTagTests(CommentTestCase):
         t = "{% load comments %}" + (tag or "{% get_comment_form for comment_tests.article a.id as form %}")
         ctx, out = self.render(t, a=Article.objects.get(pk=1))
         self.assertEqual(out, "")
-        self.assertTrue(isinstance(ctx["form"], CommentForm))
+        self.assertIsInstance(ctx["form"], CommentForm)
 
     def testGetCommentFormFromLiteral(self):
         self.testGetCommentForm("{% get_comment_form for comment_tests.article 1 as form %}")

tests/custom_managers/tests.py

@@ -19,7 +19,7 @@ class CustomManagerTests(TestCase):
         )
         # The RelatedManager used on the 'books' descriptor extends the default
         # manager
-        self.assertTrue(isinstance(p2.books, PublishedBookManager))
+        self.assertIsInstance(p2.books, PublishedBookManager)
 
         b1 = Book.published_objects.create(
             title="How to program", author="Rodney Dangerfield", is_published=True
@@ -34,7 +34,7 @@ class CustomManagerTests(TestCase):
 
         # The RelatedManager used on the 'authors' descriptor extends the
         # default manager
-        self.assertTrue(isinstance(b2.authors, PersonManager))
+        self.assertIsInstance(b2.authors, PersonManager)
 
         self.assertQuerysetEqual(
             Book.published_objects.all(), [

tests/datatypes/tests.py

@@ -74,7 +74,7 @@ class DataTypesTestCase(TestCase):
         database should be unicode."""
         d = Donut.objects.create(name='Jelly Donut', review='Outstanding')
         newd = Donut.objects.get(id=d.id)
-        self.assertTrue(isinstance(newd.review, six.text_type))
+        self.assertIsInstance(newd.review, six.text_type)
 
     @skipIfDBFeature('supports_timezones')
     def test_error_on_timezone(self):
@@ -90,7 +90,7 @@ class DataTypesTestCase(TestCase):
         a Python datetime.date, not a datetime.datetime"""
         b = RumBaba.objects.create()
         # Verify we didn't break DateTimeField behavior
-        self.assertTrue(isinstance(b.baked_timestamp, datetime.datetime))
+        self.assertIsInstance(b.baked_timestamp, datetime.datetime)
         # We need to test this this way because datetime.datetime inherits
         # from datetime.date:
-        self.assertTrue(isinstance(b.baked_date, datetime.date) and not isinstance(b.baked_date, datetime.datetime))
+        self.assertIsInstance(b.baked_date, datetime.date) and not isinstance(b.baked_date, datetime.datetime)

tests/decorators/tests.py

@@ -126,15 +126,15 @@ class DecoratorsTest(TestCase):
         my_safe_view = require_safe(my_view)
         request = HttpRequest()
         request.method = 'GET'
-        self.assertTrue(isinstance(my_safe_view(request), HttpResponse))
+        self.assertIsInstance(my_safe_view(request), HttpResponse)
         request.method = 'HEAD'
-        self.assertTrue(isinstance(my_safe_view(request), HttpResponse))
+        self.assertIsInstance(my_safe_view(request), HttpResponse)
         request.method = 'POST'
-        self.assertTrue(isinstance(my_safe_view(request), HttpResponseNotAllowed))
+        self.assertIsInstance(my_safe_view(request), HttpResponseNotAllowed)
         request.method = 'PUT'
-        self.assertTrue(isinstance(my_safe_view(request), HttpResponseNotAllowed))
+        self.assertIsInstance(my_safe_view(request), HttpResponseNotAllowed)
         request.method = 'DELETE'
-        self.assertTrue(isinstance(my_safe_view(request), HttpResponseNotAllowed))
+        self.assertIsInstance(my_safe_view(request), HttpResponseNotAllowed)
 
 
 # For testing method_decorator, a decorator that assumes a single argument.

tests/defaultfilters/tests.py

@@ -360,7 +360,7 @@ class DefaultFiltersTests(TestCase):
         escaped = force_escape('<some html & special characters > here')
         self.assertEqual(
             escaped, '&lt;some html &amp; special characters &gt; here')
-        self.assertTrue(isinstance(escaped, SafeData))
+        self.assertIsInstance(escaped, SafeData)
         self.assertEqual(
             force_escape('<some html & special characters > here ĐÅ€£'),
             '&lt;some html &amp; special characters &gt; here'\

tests/dispatch/tests/test_dispatcher.py

@@ -108,7 +108,7 @@ class DispatcherTests(unittest.TestCase):
         a_signal.connect(fails)
         result = a_signal.send_robust(sender=self, val="test")
         err = result[0][1]
-        self.assertTrue(isinstance(err, ValueError))
+        self.assertIsInstance(err, ValueError)
         self.assertEqual(err.args, ('this',))
         a_signal.disconnect(fails)
         self._testIsClean(a_signal)

tests/field_defaults/tests.py

@@ -14,6 +14,6 @@ class DefaultTests(TestCase):
         now = datetime.now()
         a.save()
 
-        self.assertTrue(isinstance(a.id, six.integer_types))
+        self.assertIsInstance(a.id, six.integer_types)
         self.assertEqual(a.headline, "Default headline")
         self.assertTrue((now - a.pub_date).seconds < 5)

tests/field_subclassing/tests.py

@@ -11,21 +11,21 @@ class CustomField(TestCase):
     def test_defer(self):
         d = DataModel.objects.create(data=[1, 2, 3])
 
-        self.assertTrue(isinstance(d.data, list))
+        self.assertIsInstance(d.data, list)
 
         d = DataModel.objects.get(pk=d.pk)
-        self.assertTrue(isinstance(d.data, list))
+        self.assertIsInstance(d.data, list)
         self.assertEqual(d.data, [1, 2, 3])
 
         d = DataModel.objects.defer("data").get(pk=d.pk)
-        self.assertTrue(isinstance(d.data, list))
+        self.assertIsInstance(d.data, list)
         self.assertEqual(d.data, [1, 2, 3])
         # Refetch for save
         d = DataModel.objects.defer("data").get(pk=d.pk)
         d.save()
 
         d = DataModel.objects.get(pk=d.pk)
-        self.assertTrue(isinstance(d.data, list))
+        self.assertIsInstance(d.data, list)
         self.assertEqual(d.data, [1, 2, 3])
 
     def test_custom_field(self):
@@ -44,7 +44,7 @@ class CustomField(TestCase):
         # The data loads back from the database correctly and 'data' has the
         # right type.
         m1 = MyModel.objects.get(pk=m.pk)
-        self.assertTrue(isinstance(m1.data, Small))
+        self.assertIsInstance(m1.data, Small)
         self.assertEqual(str(m1.data), "12")
 
         # We can do normal filtering on the custom field (and will get an error

tests/file_storage/tests.py

@@ -588,11 +588,11 @@ class ContentFileTestCase(unittest.TestCase):
         Test that ContentFile can accept both bytes and unicode and that the
         retrieved content is of the same type.
         """
-        self.assertTrue(isinstance(ContentFile(b"content").read(), bytes))
+        self.assertIsInstance(ContentFile(b"content").read(), bytes)
         if six.PY3:
-            self.assertTrue(isinstance(ContentFile("español").read(), six.text_type))
+            self.assertIsInstance(ContentFile("español").read(), six.text_type)
         else:
-            self.assertTrue(isinstance(ContentFile("español").read(), bytes))
+            self.assertIsInstance(ContentFile("español").read(), bytes)
 
     def test_content_saving(self):
         """

tests/forms_tests/tests/test_formsets.py

@@ -982,7 +982,7 @@ class FormsFormsetTestCase(TestCase):
 
         ChoiceFormSet = formset_factory(Choice, formset=BaseCustomFormSet)
         formset = ChoiceFormSet(data, auto_id=False, prefix='choices')
-        self.assertTrue(isinstance(formset.non_form_errors(), ErrorList))
+        self.assertIsInstance(formset.non_form_errors(), ErrorList)
         self.assertEqual(list(formset.non_form_errors()),
             ['This is a non-form error'])
 

tests/forms_tests/tests/tests.py

@@ -52,9 +52,9 @@ class TestTicket14567(TestCase):
         form = OptionalMultiChoiceModelForm({'multi_choice_optional': '', 'multi_choice': [option.pk]})
         self.assertTrue(form.is_valid())
         # Check that the empty value is a QuerySet
-        self.assertTrue(isinstance(form.cleaned_data['multi_choice_optional'], models.query.QuerySet))
+        self.assertIsInstance(form.cleaned_data['multi_choice_optional'], models.query.QuerySet)
         # While we're at it, test whether a QuerySet is returned if there *is* a value.
-        self.assertTrue(isinstance(form.cleaned_data['multi_choice'], models.query.QuerySet))
+        self.assertIsInstance(form.cleaned_data['multi_choice'], models.query.QuerySet)
 
 
 class ModelFormCallableModelDefault(TestCase):

tests/generic_relations/tests.py

@@ -264,4 +264,4 @@ class GenericInlineFormsetTest(TestCase):
     def test_generic_inlineformset_factory(self):
         Formset = generic_inlineformset_factory(TaggedItem, TaggedItemForm)
         form = Formset().forms[0]
-        self.assertTrue(isinstance(form['tag'].field.widget, CustomWidget))
+        self.assertIsInstance(form['tag'].field.widget, CustomWidget)

tests/generic_views/test_base.py

@@ -278,7 +278,7 @@ class TemplateViewTest(TestCase):
         response = self.client.get('/template/simple/bar/')
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.context['foo'], 'bar')
-        self.assertTrue(isinstance(response.context['view'], View))
+        self.assertIsInstance(response.context['view'], View)
 
     def test_extra_template_params(self):
         """
@@ -288,7 +288,7 @@ class TemplateViewTest(TestCase):
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.context['foo'], 'bar')
         self.assertEqual(response.context['key'], 'value')
-        self.assertTrue(isinstance(response.context['view'], View))
+        self.assertIsInstance(response.context['view'], View)
 
     def test_cached_views(self):
         """

tests/generic_views/test_detail.py

@@ -15,7 +15,7 @@ class DetailViewTest(TestCase):
         res = self.client.get('/detail/obj/')
         self.assertEqual(res.status_code, 200)
         self.assertEqual(res.context['object'], {'foo': 'bar'})
-        self.assertTrue(isinstance(res.context['view'], View))
+        self.assertIsInstance(res.context['view'], View)
         self.assertTemplateUsed(res, 'generic_views/detail.html')
 
     def test_detail_by_pk(self):

tests/generic_views/test_edit.py

@@ -43,8 +43,8 @@ class CreateViewTests(TestCase):
     def test_create(self):
         res = self.client.get('/edit/authors/create/')
         self.assertEqual(res.status_code, 200)
-        self.assertTrue(isinstance(res.context['form'], forms.ModelForm))
+        self.assertIsInstance(res.context['form'], forms.ModelForm)
-        self.assertTrue(isinstance(res.context['view'], View))
+        self.assertIsInstance(res.context['view'], View)
         self.assertFalse('object' in res.context)
         self.assertFalse('author' in res.context)
         self.assertTemplateUsed(res, 'generic_views/author_form.html')
@@ -89,7 +89,7 @@ class CreateViewTests(TestCase):
     def test_create_with_special_properties(self):
         res = self.client.get('/edit/authors/create/special/')
         self.assertEqual(res.status_code, 200)
-        self.assertTrue(isinstance(res.context['form'], views.AuthorForm))
+        self.assertIsInstance(res.context['form'], views.AuthorForm)
         self.assertFalse('object' in res.context)
         self.assertFalse('author' in res.context)
         self.assertTemplateUsed(res, 'generic_views/form.html')
@@ -165,7 +165,7 @@ class UpdateViewTests(TestCase):
         )
         res = self.client.get('/edit/author/%d/update/' % a.pk)
         self.assertEqual(res.status_code, 200)
-        self.assertTrue(isinstance(res.context['form'], forms.ModelForm))
+        self.assertIsInstance(res.context['form'], forms.ModelForm)
         self.assertEqual(res.context['object'], Author.objects.get(pk=a.pk))
         self.assertEqual(res.context['author'], Author.objects.get(pk=a.pk))
         self.assertTemplateUsed(res, 'generic_views/author_form.html')
@@ -247,7 +247,7 @@ class UpdateViewTests(TestCase):
         )
         res = self.client.get('/edit/author/%d/update/special/' % a.pk)
         self.assertEqual(res.status_code, 200)
-        self.assertTrue(isinstance(res.context['form'], views.AuthorForm))
+        self.assertIsInstance(res.context['form'], views.AuthorForm)
         self.assertEqual(res.context['object'], Author.objects.get(pk=a.pk))
         self.assertEqual(res.context['thingy'], Author.objects.get(pk=a.pk))
         self.assertFalse('author' in res.context)
@@ -279,8 +279,8 @@ class UpdateViewTests(TestCase):
         )
         res = self.client.get('/edit/author/update/')
         self.assertEqual(res.status_code, 200)
-        self.assertTrue(isinstance(res.context['form'], forms.ModelForm))
+        self.assertIsInstance(res.context['form'], forms.ModelForm)
-        self.assertTrue(isinstance(res.context['view'], View))
+        self.assertIsInstance(res.context['view'], View)
         self.assertEqual(res.context['object'], Author.objects.get(pk=a.pk))
         self.assertEqual(res.context['author'], Author.objects.get(pk=a.pk))
         self.assertTemplateUsed(res, 'generic_views/author_form.html')

tests/generic_views/test_list.py

@@ -24,7 +24,7 @@ class ListViewTests(TestCase):
         self.assertEqual(res.status_code, 200)
         self.assertTemplateUsed(res, 'generic_views/author_list.html')
         self.assertEqual(list(res.context['object_list']), list(Author.objects.all()))
-        self.assertTrue(isinstance(res.context['view'], View))
+        self.assertIsInstance(res.context['view'], View)
         self.assertIs(res.context['author_list'], res.context['object_list'])
         self.assertIsNone(res.context['paginator'])
         self.assertIsNone(res.context['page_obj'])

tests/logging_tests/tests.py

@@ -293,7 +293,7 @@ class AdminEmailHandlerTest(TestCase):
 
         def my_mail_admins(*args, **kwargs):
             connection = kwargs['connection']
-            self.assertTrue(isinstance(connection, MyEmailBackend))
+            self.assertIsInstance(connection, MyEmailBackend)
             mail_admins_called['called'] = True
 
         # Monkeypatches

tests/mail/tests.py

@@ -251,16 +251,16 @@ class MailTests(TestCase):
 
     def test_backend_arg(self):
         """Test backend argument of mail.get_connection()"""
-        self.assertTrue(isinstance(mail.get_connection('django.core.mail.backends.smtp.EmailBackend'), smtp.EmailBackend))
+        self.assertIsInstance(mail.get_connection('django.core.mail.backends.smtp.EmailBackend'), smtp.EmailBackend)
-        self.assertTrue(isinstance(mail.get_connection('django.core.mail.backends.locmem.EmailBackend'), locmem.EmailBackend))
+        self.assertIsInstance(mail.get_connection('django.core.mail.backends.locmem.EmailBackend'), locmem.EmailBackend)
-        self.assertTrue(isinstance(mail.get_connection('django.core.mail.backends.dummy.EmailBackend'), dummy.EmailBackend))
+        self.assertIsInstance(mail.get_connection('django.core.mail.backends.dummy.EmailBackend'), dummy.EmailBackend)
-        self.assertTrue(isinstance(mail.get_connection('django.core.mail.backends.console.EmailBackend'), console.EmailBackend))
+        self.assertIsInstance(mail.get_connection('django.core.mail.backends.console.EmailBackend'), console.EmailBackend)
         tmp_dir = tempfile.mkdtemp()
         try:
-            self.assertTrue(isinstance(mail.get_connection('django.core.mail.backends.filebased.EmailBackend', file_path=tmp_dir), filebased.EmailBackend))
+            self.assertIsInstance(mail.get_connection('django.core.mail.backends.filebased.EmailBackend', file_path=tmp_dir), filebased.EmailBackend)
         finally:
             shutil.rmtree(tmp_dir)
-        self.assertTrue(isinstance(mail.get_connection(), locmem.EmailBackend))
+        self.assertIsInstance(mail.get_connection(), locmem.EmailBackend)
 
     @override_settings(
         EMAIL_BACKEND='django.core.mail.backends.locmem.EmailBackend',

tests/model_fields/tests.py

@@ -193,28 +193,28 @@ class BooleanFieldTests(unittest.TestCase):
         b.bfield = True
         b.save()
         b2 = BooleanModel.objects.get(pk=b.pk)
-        self.assertTrue(isinstance(b2.bfield, bool))
+        self.assertIsInstance(b2.bfield, bool)
         self.assertEqual(b2.bfield, True)
 
         b3 = BooleanModel()
         b3.bfield = False
         b3.save()
         b4 = BooleanModel.objects.get(pk=b3.pk)
-        self.assertTrue(isinstance(b4.bfield, bool))
+        self.assertIsInstance(b4.bfield, bool)
         self.assertEqual(b4.bfield, False)
 
         b = NullBooleanModel()
         b.nbfield = True
         b.save()
         b2 = NullBooleanModel.objects.get(pk=b.pk)
-        self.assertTrue(isinstance(b2.nbfield, bool))
+        self.assertIsInstance(b2.nbfield, bool)
         self.assertEqual(b2.nbfield, True)
 
         b3 = NullBooleanModel()
         b3.nbfield = False
         b3.save()
         b4 = NullBooleanModel.objects.get(pk=b3.pk)
-        self.assertTrue(isinstance(b4.nbfield, bool))
+        self.assertIsInstance(b4.nbfield, bool)
         self.assertEqual(b4.nbfield, False)
 
         # http://code.djangoproject.com/ticket/13293
@@ -371,11 +371,11 @@ class BigIntegerFieldTests(test.TestCase):
 
     def test_types(self):
         b = BigInt(value = 0)
-        self.assertTrue(isinstance(b.value, six.integer_types))
+        self.assertIsInstance(b.value, six.integer_types)
         b.save()
-        self.assertTrue(isinstance(b.value, six.integer_types))
+        self.assertIsInstance(b.value, six.integer_types)
         b = BigInt.objects.all()[0]
-        self.assertTrue(isinstance(b.value, six.integer_types))
+        self.assertIsInstance(b.value, six.integer_types)
 
     def test_coercing(self):
         BigInt.objects.create(value ='10')

tests/model_forms/tests.py

@@ -274,8 +274,8 @@ class ModelFormBaseTest(TestCase):
                 model = Category
                 fields = '__all__'
 
-        self.assertTrue(isinstance(ReplaceField.base_fields['url'],
+        self.assertIsInstance(ReplaceField.base_fields['url'],
-                                     forms.fields.BooleanField))
+                                     forms.fields.BooleanField)
 
     def test_replace_field_variant_2(self):
         # Should have the same result as before,
@@ -287,8 +287,8 @@ class ModelFormBaseTest(TestCase):
                 model = Category
                 fields = ['url']
 
-        self.assertTrue(isinstance(ReplaceField.base_fields['url'],
+        self.assertIsInstance(ReplaceField.base_fields['url'],
-                                     forms.fields.BooleanField))
+                                     forms.fields.BooleanField)
 
     def test_replace_field_variant_3(self):
         # Should have the same result as before,
@@ -300,8 +300,8 @@ class ModelFormBaseTest(TestCase):
                 model = Category
                 fields = [] # url will still appear, since it is explicit above
 
-        self.assertTrue(isinstance(ReplaceField.base_fields['url'],
+        self.assertIsInstance(ReplaceField.base_fields['url'],
-                                     forms.fields.BooleanField))
+                                     forms.fields.BooleanField)
 
     def test_override_field(self):
         class AuthorForm(forms.ModelForm):

tests/model_formsets_regress/tests.py

@@ -236,11 +236,11 @@ class FormsetTests(TestCase):
         formset = Formset(data)
         # check if the returned error classes are correct
         # note: formset.errors returns a list as documented
-        self.assertTrue(isinstance(formset.errors, list))
+        self.assertIsInstance(formset.errors, list)
-        self.assertTrue(isinstance(formset.non_form_errors(), ErrorList))
+        self.assertIsInstance(formset.non_form_errors(), ErrorList)
         for form in formset.forms:
-            self.assertTrue(isinstance(form.errors, ErrorDict))
+            self.assertIsInstance(form.errors, ErrorDict)
-            self.assertTrue(isinstance(form.non_field_errors(), ErrorList))
+            self.assertIsInstance(form.non_field_errors(), ErrorList)
 
     def test_initial_data(self):
         User.objects.create(username="bibi", serial=1)
@@ -296,16 +296,16 @@ class FormfieldCallbackTests(TestCase):
     def test_inlineformset_factory_default(self):
         Formset = inlineformset_factory(User, UserSite, form=UserSiteForm, fields="__all__")
         form = Formset().forms[0]
-        self.assertTrue(isinstance(form['id'].field.widget, CustomWidget))
+        self.assertIsInstance(form['id'].field.widget, CustomWidget)
-        self.assertTrue(isinstance(form['data'].field.widget, CustomWidget))
+        self.assertIsInstance(form['data'].field.widget, CustomWidget)
         self.assertFalse(form.fields['id'].localize)
         self.assertTrue(form.fields['data'].localize)
 
     def test_modelformset_factory_default(self):
         Formset = modelformset_factory(UserSite, form=UserSiteForm)
         form = Formset().forms[0]
-        self.assertTrue(isinstance(form['id'].field.widget, CustomWidget))
+        self.assertIsInstance(form['id'].field.widget, CustomWidget)
-        self.assertTrue(isinstance(form['data'].field.widget, CustomWidget))
+        self.assertIsInstance(form['data'].field.widget, CustomWidget)
         self.assertFalse(form.fields['id'].localize)
         self.assertTrue(form.fields['data'].localize)
 

tests/unmanaged_models/tests.py

@@ -23,14 +23,14 @@ class SimpleTests(TestCase):
 
         # ... and pull it out via the other set.
         a2 = A02.objects.all()[0]
-        self.assertTrue(isinstance(a2, A02))
+        self.assertIsInstance(a2, A02)
         self.assertEqual(a2.f_a, "foo")
 
         b2 = B02.objects.all()[0]
-        self.assertTrue(isinstance(b2, B02))
+        self.assertIsInstance(b2, B02)
         self.assertEqual(b2.f_a, "fred")
 
-        self.assertTrue(isinstance(b2.fk_a, A02))
+        self.assertIsInstance(b2.fk_a, A02)
         self.assertEqual(b2.fk_a.f_a, "foo")
 
         self.assertEqual(list(C02.objects.filter(f_a=None)), [])
@@ -38,7 +38,7 @@ class SimpleTests(TestCase):
         resp = list(C02.objects.filter(mm_a=a.id))
         self.assertEqual(len(resp), 1)
 
-        self.assertTrue(isinstance(resp[0], C02))
+        self.assertIsInstance(resp[0], C02)
         self.assertEqual(resp[0].f_a, 'barney')
 
 

tests/urlpatterns_reverse/tests.py

@@ -246,7 +246,7 @@ class ResolverTests(unittest.TestCase):
             self.assertEqual(len(e.args[0]['tried']), len(url_types_names), 'Wrong number of tried URLs returned.  Expected %s, got %s.' % (len(url_types_names), len(e.args[0]['tried'])))
             for tried, expected in zip(e.args[0]['tried'], url_types_names):
                 for t, e in zip(tried, expected):
-                    self.assertTrue(isinstance(t, e['type']), str('%s is not an instance of %s') % (t, e['type']))
+                    self.assertIsInstance(t, e['type']), str('%s is not an instance of %s') % (t, e['type'])
                     if 'name' in e:
                         if not e['name']:
                             self.assertTrue(t.name is None, 'Expected no URL name but found %s.' % t.name)
@@ -278,11 +278,11 @@ class ReverseShortcutTests(TestCase):
                 return "/hi-there/"
 
         res = redirect(FakeObj())
-        self.assertTrue(isinstance(res, HttpResponseRedirect))
+        self.assertIsInstance(res, HttpResponseRedirect)
         self.assertEqual(res.url, '/hi-there/')
 
         res = redirect(FakeObj(), permanent=True)
-        self.assertTrue(isinstance(res, HttpResponsePermanentRedirect))
+        self.assertIsInstance(res, HttpResponsePermanentRedirect)
         self.assertEqual(res.url, '/hi-there/')
 
     def test_redirect_to_view_name(self):

tests/utils_tests/test_baseconv.py

@@ -39,4 +39,4 @@ class TestBaseConv(TestCase):
 
     def test_exception(self):
         self.assertRaises(ValueError, BaseConverter, 'abc', sign='a')
-        self.assertTrue(isinstance(BaseConverter('abc', sign='d'), BaseConverter))
+        self.assertIsInstance(BaseConverter('abc', sign='d'), BaseConverter)

tests/utils_tests/test_simplelazyobject.py

@@ -68,7 +68,7 @@ class TestUtilsSimpleLazyObject(TestCase):
 
         # Second, for an evaluated SimpleLazyObject
         name = x.name  # evaluate
-        self.assertTrue(isinstance(x._wrapped, _ComplexObject))
+        self.assertIsInstance(x._wrapped, _ComplexObject)
         # __repr__ contains __repr__ of wrapped object
         self.assertEqual("<SimpleLazyObject: %r>" % x._wrapped, repr(x))
 

tests/view_tests/tests/test_static.py

@@ -60,7 +60,7 @@ class StaticTests(TestCase):
             # This is 24h before max Unix time. Remember to fix Django and
             # update this test well before 2038 :)
             )
-        self.assertTrue(isinstance(response, HttpResponseNotModified))
+        self.assertIsInstance(response, HttpResponseNotModified)
 
     def test_invalid_if_modified_since(self):
         """Handle bogus If-Modified-Since values gracefully