Fixed #26707 -- Added QueryDict.fromkeys()

tests/httpwrappers/tests.py

@@ -25,7 +25,7 @@ from django.utils.encoding import force_str
 from django.utils.functional import lazystr
 
 
-class QueryDictTests(unittest.TestCase):
+class QueryDictTests(SimpleTestCase):
     def test_create_with_no_args(self):
         self.assertEqual(QueryDict(), QueryDict(str('')))
 
@@ -271,6 +271,44 @@ class QueryDictTests(unittest.TestCase):
         self.assertEqual(copy.copy(q).encoding, 'iso-8859-15')
         self.assertEqual(copy.deepcopy(q).encoding, 'iso-8859-15')
 
+    def test_querydict_fromkeys(self):
+        self.assertEqual(QueryDict.fromkeys(['key1', 'key2', 'key3']), QueryDict('key1&key2&key3'))
+
+    def test_fromkeys_with_nonempty_value(self):
+        self.assertEqual(
+            QueryDict.fromkeys(['key1', 'key2', 'key3'], value='val'),
+            QueryDict('key1=val&key2=val&key3=val')
+        )
+
+    def test_fromkeys_is_immutable_by_default(self):
+        # Match behavior of __init__() which is also immutable by default.
+        q = QueryDict.fromkeys(['key1', 'key2', 'key3'])
+        with self.assertRaisesMessage(AttributeError, 'This QueryDict instance is immutable'):
+            q['key4'] = 'nope'
+
+    def test_fromkeys_mutable_override(self):
+        q = QueryDict.fromkeys(['key1', 'key2', 'key3'], mutable=True)
+        q['key4'] = 'yep'
+        self.assertEqual(q, QueryDict('key1&key2&key3&key4=yep'))
+
+    def test_duplicates_in_fromkeys_iterable(self):
+        self.assertEqual(QueryDict.fromkeys('xyzzy'), QueryDict('x&y&z&z&y'))
+
+    def test_fromkeys_with_nondefault_encoding(self):
+        key_utf16 = b'\xff\xfe\x8e\x02\xdd\x01\x9e\x02'
+        value_utf16 = b'\xff\xfe\xdd\x01n\x00l\x00P\x02\x8c\x02'
+        q = QueryDict.fromkeys([key_utf16], value=value_utf16, encoding='utf-16')
+        expected = QueryDict('', mutable=True)
+        expected['ʎǝʞ'] = 'ǝnlɐʌ'
+        self.assertEqual(q, expected)
+
+    def test_fromkeys_empty_iterable(self):
+        self.assertEqual(QueryDict.fromkeys([]), QueryDict(''))
+
+    def test_fromkeys_noniterable(self):
+        with self.assertRaises(TypeError):
+            QueryDict.fromkeys(0)
+
 
 class HttpResponseTests(unittest.TestCase):