Fixed #21572 -- Added unit test for django.utils.text.normalize_newlines.

tests/utils_tests/test_text.py

@@ -107,6 +107,13 @@ class TestUtilsText(SimpleTestCase):
         self.assertEqual(text.wrap('a %s word' % long_word, 10),
                          'a\n%s\nword' % long_word)
 
+    def test_normalize_newlines(self):
+        self.assertEqual(text.normalize_newlines("abc\ndef\rghi\r\n"),
+                         "abc\ndef\nghi\n")
+        self.assertEqual(text.normalize_newlines("\n\r\r\n\r"), "\n\n\n\n")
+        self.assertEqual(text.normalize_newlines("abcdefghi"), "abcdefghi")
+        self.assertEqual(text.normalize_newlines(""), "")
+
     def test_slugify(self):
         items = (
             ('Hello, World!', 'hello-world'),