diff --git a/dvc/updater.py b/dvc/updater.py
index 33c5de436..ca839eb99 100644
--- a/dvc/updater.py
+++ b/dvc/updater.py
@@ -1,5 +1,5 @@
 from __future__ import unicode_literals
-from dvc.utils.compat import str, open
+from dvc.utils.compat import str
 
 import sys
 import os
diff --git a/tests/unit/updater.py b/tests/unit/updater.py
new file mode 100644
index 000000000..490409d9e
--- /dev/null
+++ b/tests/unit/updater.py
@@ -0,0 +1,39 @@
+import os
+import json
+import mock
+
+from dvc import VERSION
+from tests.basic_env import TestDvc
+
+
+class MockResponse(object):
+    def __init__(self, json_data, status_code):
+        self.json_data = json_data
+        self.status_code = status_code
+
+    def json(self):
+        return self.json_data
+
+
+def mocked_requests_get(*args, **kwargs):
+    class MockResponse:
+        def __init__(self, json_data, status_code):
+            self.json_data = json_data
+            self.status_code = status_code
+
+        def json(self):
+            return self.json_data
+
+    return MockResponse({"version": VERSION}, 200)
+
+
+class TestUpdater(TestDvc):
+    @mock.patch("requests.get", side_effect=mocked_requests_get)
+    def test_fetch(self, mock_get):
+        self.assertFalse(os.path.exists(self.dvc.updater.updater_file))
+        self.dvc.updater.fetch(detach=False)
+        mock_get.assert_called_once()
+        self.assertTrue(os.path.isfile(self.dvc.updater.updater_file))
+        with open(self.dvc.updater.updater_file, "r") as fobj:
+            info = json.load(fobj)
+        self.assertEqual(info["version"], VERSION)