<<<
--- /django__django/tests/utils_tests/test_numberformat.py
+++ /django__django/tests/utils_tests/test_numberformat.py
@@ -6,6 +6,13 @@
 
 
 class TestNumberFormat(SimpleTestCase):
+    def test_format_number_null_input(self):
+        self.assertIsNone(nformat(None, ".", decimal_pos=2))
+        self.assertIsNone(nformat("", ".", decimal_pos=2))
+
+    def test_format_number_valid_input(self):
+        self.assertEqual(nformat("123.45", ".", decimal_pos=1), "123.4")
+
     def test_format_number(self):
         self.assertEqual(nformat(1234, "."), "1234")
         self.assertEqual(nformat(1234.2, "."), "1234.2")
>>>