Ensure that a resolve conf object is written as a string.

Instead of passing the raw object and expecting the write_file to work
automatically make sure we explicitly pass the string version of it so
that the write_file routine can correctly encode/decode it as needed.

LP: #1479988

1 files changed, 6 insertions, 0 deletions

diff --git a/tests/unittests/test_distros/test_resolv.py b/tests/unittests/test_distros/test_resolv.py
index faaf5b7f..9edeb6e7 100644
--- a/tests/unittests/test_distros/test_resolv.py
+++ b/tests/unittests/test_distros/test_resolv.py
@@ -1,6 +1,8 @@
 from cloudinit.distros.parsers import resolv_conf
+from cloudinit.distros import rhel_util
 
 import re
+import tempfile
 from ..helpers import TestCase
 
 
@@ -19,6 +21,10 @@ class TestResolvHelper(TestCase):
         rp_r = str(rp).strip()
         self.assertEquals(BASE_RESOLVE, rp_r)
 
+    def test_write_works(self):
+        with tempfile.NamedTemporaryFile() as fh:
+            rhel_util.update_resolve_conf_file(fh.name, [], [])
+
     def test_local_domain(self):
         rp = resolv_conf.ResolvConf(BASE_RESOLVE)
         self.assertEquals(None, rp.local_domain)