diff --git a/tests/utils_tests/test_regex_helper.py b/tests/utils_tests/test_regex_helper.py
index 77bcd5bb35..895890bd26 100644
--- a/tests/utils_tests/test_regex_helper.py
+++ b/tests/utils_tests/test_regex_helper.py
@@ -1,5 +1,7 @@
+import re
 import unittest
 
+from django.test import SimpleTestCase
 from django.utils import regex_helper
 
 
@@ -41,3 +43,12 @@ class NormalizeTests(unittest.TestCase):
                     ['first_group_name'])]
         result = regex_helper.normalize(pattern)
         self.assertEqual(result, expected)
+
+
+class LazyReCompileTests(SimpleTestCase):
+    def test_flags_with_pre_compiled_regex(self):
+        test_pattern = re.compile('test')
+        lazy_test_pattern = regex_helper._lazy_re_compile(test_pattern, re.I)
+        msg = 'flags must be empty if regex is passed pre-compiled'
+        with self.assertRaisesMessage(AssertionError, msg):
+            lazy_test_pattern.match('TEST')
diff --git a/tests/version/tests.py b/tests/version/tests.py
index c0075744bc..bfa4af0496 100644
--- a/tests/version/tests.py
+++ b/tests/version/tests.py
@@ -1,6 +1,6 @@
 from django import get_version
 from django.test import SimpleTestCase
-from django.utils.version import get_version_tuple
+from django.utils.version import get_complete_version, get_version_tuple
 
 
 class VersionTests(SimpleTestCase):
@@ -28,3 +28,14 @@ class VersionTests(SimpleTestCase):
         self.assertEqual(get_version_tuple('1.2.3'), (1, 2, 3))
         self.assertEqual(get_version_tuple('1.2.3b2'), (1, 2, 3))
         self.assertEqual(get_version_tuple('1.2.3b2.dev0'), (1, 2, 3))
+
+    def test_get_version_invalid_version(self):
+        tests = [
+            # Invalid length.
+            (3, 2, 0, 'alpha', 1, '20210315111111'),
+            # Invalid development status.
+            (3, 2, 0, 'gamma', 1, '20210315111111'),
+        ]
+        for version in tests:
+            with self.subTest(version=version), self.assertRaises(AssertionError):
+                get_complete_version(version)