[3.0.x] Fixed #31073 -- Prevented CheckboxInput.get_context() from mutating attrs.

Backport of 02eff7ef60466da108b1a33f1e4dc01eec45c99d from master

1 files changed, 11 insertions, 0 deletions

diff --git a/tests/postgres_tests/test_array.py b/tests/postgres_tests/test_array.py
index 42885e61f6..29b67d6fbc 100644
--- a/tests/postgres_tests/test_array.py
+++ b/tests/postgres_tests/test_array.py
@@ -1003,6 +1003,17 @@ class TestSplitFormWidget(PostgreSQLWidgetTestCase):
             }
         )
 
+    def test_checkbox_get_context_attrs(self):
+        context = SplitArrayWidget(
+            forms.CheckboxInput(),
+            size=2,
+        ).get_context('name', [True, False])
+        self.assertEqual(context['widget']['value'], '[True, False]')
+        self.assertEqual(
+            [subwidget['attrs'] for subwidget in context['widget']['subwidgets']],
+            [{'checked': True}, {}]
+        )
+
     def test_render(self):
         self.check_html(
             SplitArrayWidget(forms.TextInput(), size=2), 'array', None,