1 files changed, 20 insertions, 0 deletions
diff --git a/cloudinit/tests/test_util.py b/cloudinit/tests/test_util.py
index e3d2dbaa..f4f95e92 100644
--- a/cloudinit/tests/test_util.py
+++ b/cloudinit/tests/test_util.py
@@ -2,7 +2,9 @@
 
 """Tests for cloudinit.util"""
 
+import base64
 import logging
+import json
 import platform
 
 import cloudinit.util as util
@@ -528,6 +530,24 @@ class TestGetLinuxDistro(CiTestCase):
         self.assertEqual(('foo', '1.1', 'aarch64'), dist)
 
 
+class TestJsonDumps(CiTestCase):
+    def test_is_str(self):
+        """json_dumps should return a string."""
+        self.assertTrue(isinstance(util.json_dumps({'abc': '123'}), str))
+
+    def test_utf8(self):
+        smiley = '\\ud83d\\ude03'
+        self.assertEqual(
+            {'smiley': smiley},
+            json.loads(util.json_dumps({'smiley': smiley})))
+
+    def test_non_utf8(self):
+        blob = b'\xba\x03Qx-#y\xea'
+        self.assertEqual(
+            {'blob': 'ci-b64:' + base64.b64encode(blob).decode('utf-8')},
+            json.loads(util.json_dumps({'blob': blob})))
+
+
 @mock.patch('os.path.exists')
 class TestIsLXD(CiTestCase):