Removed support for admin validators per deprecation timeline; refs #16905.

tests/modeladmin/tests.py

@@ -7,16 +7,13 @@ from django.contrib.admin.options import (ModelAdmin, TabularInline,
      HORIZONTAL, VERTICAL)
 from django.contrib.admin.sites import AdminSite
 from django.contrib.admin.widgets import AdminDateWidget, AdminRadioSelect
-from django.contrib.admin.validation import ModelAdminValidator
 from django.contrib.admin import (SimpleListFilter,
      BooleanFieldListFilter)
 from django.core.checks import Error
-from django.core.exceptions import ImproperlyConfigured
 from django.forms.models import BaseModelFormSet
 from django.forms.widgets import Select
-from django.test import TestCase, ignore_warnings
+from django.test import TestCase
 from django.utils import six
-from django.utils.deprecation import RemovedInDjango19Warning
 
 from .models import Band, Concert, ValidationTestModel, ValidationTestInlineModel
 
@@ -1503,21 +1500,6 @@ class FormsetCheckTests(CheckTestCase):
         self.assertIsValid(ValidationTestModelAdmin, ValidationTestModel)
 
 
-class CustomModelAdminTests(CheckTestCase):
-    @ignore_warnings(category=RemovedInDjango19Warning)
-    def test_deprecation(self):
-        "Deprecated Custom Validator definitions still work with the check framework."
-
-        class CustomValidator(ModelAdminValidator):
-            def validate_me(self, model_admin, model):
-                raise ImproperlyConfigured('error!')
-
-        class CustomModelAdmin(ModelAdmin):
-            validator_class = CustomValidator
-
-        self.assertIsInvalid(CustomModelAdmin, ValidationTestModel, 'error!')
-
-
 class ListDisplayEditableTests(CheckTestCase):
     def test_list_display_links_is_none(self):
         """