Fix tests, force reevaluate field queryset

utils/tests/test_forms.py

@@ -11,6 +11,11 @@ User = get_user_model()
 
 class KeepUnselectableModelFormMixinTests(TestCase):
 
+    def _get_form_cls(self):
+        """
+        We recreate a new form class for each test, because `queryset` may not
+        be reevaluate and miss the permissions created by `setUp`.
+        """
         class ExampleForm(KeepUnselectableModelFormMixin, forms.ModelForm):
             user_permissions = forms.ModelMultipleChoiceField(
                 queryset=Permission.objects.filter(
@@ -22,31 +27,33 @@ class KeepUnselectableModelFormMixinTests(TestCase):
             class Meta:
                 model = User
                 fields = ('username', 'user_permissions')
+        return ExampleForm
 
     def setUp(self):
         ct = ContentType.objects.get_for_model(Permission)
 
         self.unselec_perm1 = Permission.objects.create(
-            content_type=ct, codename='unselec_perm1')
+            content_type=ct, codename='unselec_perm1', name='Unselectable 1')
         self.unselec_perm2 = Permission.objects.create(
-            content_type=ct, codename='unselec_perm2')
+            content_type=ct, codename='unselec_perm2', name='Unselectable 2')
 
         # These two perms are the only selectable permissions from
         # 'permissions' field of ExampleForm.
         self.selec_perm1 = Permission.objects.create(
-            content_type=ct, codename='selec_perm1')
+            content_type=ct, codename='selec_perm1', name='Selectable 1')
         self.selec_perm2 = Permission.objects.create(
-            content_type=ct, codename='selec_perm2')
+            content_type=ct, codename='selec_perm2', name='Selectable 2')
 
     def test_creation(self):
         """
         The mixin functions properly when instance is being created.
         """
+        ExampleForm = self._get_form_cls()
         data = {
             'username': 'user',
             'user_permissions': [self.selec_perm1.pk],
         }
-        form = self.ExampleForm(data)
+        form = ExampleForm(data)
 
         instance = form.save()
 
@@ -62,11 +69,12 @@ class KeepUnselectableModelFormMixinTests(TestCase):
 
         https://docs.djangoproject.com/en/1.11/topics/forms/modelforms/#the-save-method
         """
+        ExampleForm = self._get_form_cls()
         data = {
             'username': 'user',
             'user_permissions': [self.selec_perm1.pk],
         }
-        form = self.ExampleForm(data)
+        form = ExampleForm(data)
 
         instance = form.save(commit=False)
 
@@ -89,11 +97,12 @@ class KeepUnselectableModelFormMixinTests(TestCase):
         # Link instance with an unselectable and a selectable permissions.
         instance.user_permissions.add(self.unselec_perm1, self.selec_perm2)
 
+        ExampleForm = self._get_form_cls()
         data = {
             'username': 'user',
             'user_permissions': [self.selec_perm1.pk],
         }
-        form = self.ExampleForm(data, instance=instance)
+        form = ExampleForm(data, instance=instance)
 
         instance = form.save()
 
@@ -111,11 +120,12 @@ class KeepUnselectableModelFormMixinTests(TestCase):
         # Link instance with an unselectable and a selectable permissions.
         instance.user_permissions.add(self.unselec_perm1, self.selec_perm2)
 
+        ExampleForm = self._get_form_cls()
         data = {
             'username': 'changed',
             'user_permissions': [self.selec_perm1.pk],
         }
-        form = self.ExampleForm(data, instance=instance)
+        form = ExampleForm(data, instance=instance)
 
         instance = form.save(commit=False)