[4.0.x] Refs #31026 -- Fixed forms_tests if Jinja2 is not installed.

Backport of 881a479911 from main

tests/forms_tests/tests/__init__.py

@@ -1,30 +1,16 @@
-import inspect
+from unittest import skipIf
 
 from django.test.utils import override_settings
 
-TEST_SETTINGS = [
-    {
-        'FORM_RENDERER': 'django.forms.renderers.DjangoTemplates',
-        'TEMPLATES': {'BACKEND': 'django.template.backends.django.DjangoTemplates'},
-    },
-    {
-        'FORM_RENDERER': 'django.forms.renderers.Jinja2',
-        'TEMPLATES': {'BACKEND': 'django.template.backends.jinja2.Jinja2'},
-    },
-]
+try:
+    import jinja2
+except ImportError:
+    jinja2 = None
 
 
-def test_all_form_renderers():
-    def wrapper(func):
-        def inner(*args, **kwargs):
-            for settings in TEST_SETTINGS:
-                with override_settings(**settings):
-                    func(*args, **kwargs)
-        return inner
-
-    def decorator(cls):
-        for name, func in inspect.getmembers(cls, inspect.isfunction):
-            if name.startswith('test_'):
-                setattr(cls, name, wrapper(func))
-        return cls
-    return decorator
+def jinja2_tests(test_func):
+    test_func = skipIf(jinja2 is None, 'this test requires jinja2')(test_func)
+    return override_settings(
+        FORM_RENDERER='django.forms.renderers.Jinja2',
+        TEMPLATES={'BACKEND': 'django.template.backends.jinja2.Jinja2'},
+    )(test_func)

tests/forms_tests/tests/test_forms.py

@@ -23,7 +23,7 @@ from django.test import SimpleTestCase
 from django.test.utils import override_settings
 from django.utils.datastructures import MultiValueDict
 from django.utils.safestring import mark_safe
-from tests.forms_tests.tests import test_all_form_renderers
+from tests.forms_tests.tests import jinja2_tests
 
 
 class FrameworkForm(Form):
@@ -56,7 +56,6 @@ class MultiValueDictLike(dict):
         return [self[key]]
 
 
-@test_all_form_renderers()
 class FormsTestCase(SimpleTestCase):
     # A Form is a collection of Fields. It knows how to validate a set of data and it
     # knows how to render itself in a couple of default ways (e.g., an HTML table).
@@ -3541,6 +3540,11 @@ Password: <input type="password" name="password" required>
         )
 
 
+@jinja2_tests
+class Jinja2FormsTestCase(FormsTestCase):
+    pass
+
+
 class CustomRenderer(DjangoTemplates):
     pass
 

tests/forms_tests/tests/test_formsets.py

@@ -11,7 +11,7 @@ from django.forms.formsets import BaseFormSet, all_valid, formset_factory
 from django.forms.utils import ErrorList
 from django.forms.widgets import HiddenInput
 from django.test import SimpleTestCase
-from tests.forms_tests.tests import test_all_form_renderers
+from tests.forms_tests.tests import jinja2_tests
 
 
 class Choice(Form):
@@ -48,7 +48,6 @@ class CustomKwargForm(Form):
         super().__init__(*args, **kwargs)
 
 
-@test_all_form_renderers()
 class FormsFormsetTestCase(SimpleTestCase):
 
     def make_choiceformset(
@@ -1315,7 +1314,11 @@ class FormsFormsetTestCase(SimpleTestCase):
         self.assertEqual(formset.empty_form.renderer, renderer)
 
 
-@test_all_form_renderers()
+@jinja2_tests
+class Jinja2FormsFormsetTestCase(FormsFormsetTestCase):
+    pass
+
+
 class FormsetAsTagTests(SimpleTestCase):
     def setUp(self):
         data = {
@@ -1364,6 +1367,11 @@ class FormsetAsTagTests(SimpleTestCase):
         )
 
 
+@jinja2_tests
+class Jinja2FormsetAsTagTests(FormsetAsTagTests):
+    pass
+
+
 class ArticleForm(Form):
     title = CharField()
     pub_date = DateField()
@@ -1372,7 +1380,6 @@ class ArticleForm(Form):
 ArticleFormSet = formset_factory(ArticleForm)
 
 
-@test_all_form_renderers()
 class TestIsBoundBehavior(SimpleTestCase):
     def test_no_data_error(self):
         formset = ArticleFormSet({})
@@ -1485,6 +1492,11 @@ class TestIsBoundBehavior(SimpleTestCase):
         self.assertHTMLEqual(empty_forms[0].as_p(), empty_forms[1].as_p())
 
 
+@jinja2_tests
+class TestIsBoundBehavior(TestIsBoundBehavior):
+    pass
+
+
 class TestEmptyFormSet(SimpleTestCase):
     def test_empty_formset_is_valid(self):
         """An empty formset still calls clean()"""

tests/forms_tests/tests/test_i18n.py

@@ -4,10 +4,9 @@ from django.forms import (
 from django.test import SimpleTestCase
 from django.utils import translation
 from django.utils.translation import gettext_lazy
-from tests.forms_tests.tests import test_all_form_renderers
+from tests.forms_tests.tests import jinja2_tests
 
 
-@test_all_form_renderers()
 class FormsI18nTests(SimpleTestCase):
     def test_lazy_labels(self):
         class SomeForm(Form):
@@ -95,3 +94,8 @@ class FormsI18nTests(SimpleTestCase):
             degree = IntegerField(widget=Select(choices=((1, gettext_lazy('test')),)))
 
         CopyForm()
+
+
+@jinja2_tests
+class Jinja2FormsI18nTests(FormsI18nTests):
+    pass

tests/forms_tests/tests/tests.py

@@ -5,7 +5,7 @@ from django.db import models
 from django.forms import CharField, FileField, Form, ModelForm
 from django.forms.models import ModelFormMetaclass
 from django.test import SimpleTestCase, TestCase
-from tests.forms_tests.tests import test_all_form_renderers
+from tests.forms_tests.tests import jinja2_tests
 
 from ..models import (
     BoundaryModel, ChoiceFieldModel, ChoiceModel, ChoiceOptionModel, Defaults,
@@ -284,7 +284,6 @@ class ManyToManyExclusionTestCase(TestCase):
         self.assertEqual([obj.pk for obj in form.instance.multi_choice_int.all()], data['multi_choice_int'])
 
 
-@test_all_form_renderers()
 class EmptyLabelTestCase(TestCase):
     def test_empty_field_char(self):
         f = EmptyCharLabelChoiceForm()
@@ -374,3 +373,8 @@ class EmptyLabelTestCase(TestCase):
 <option value="2">Bar</option>
 </select></p>"""
         )
+
+
+@jinja2_tests
+class Jinja2EmptyLabelTestCase(EmptyLabelTestCase):
+    pass