1 files changed, 23 insertions, 0 deletions
diff --git a/taskcluster/taskgraph/test/test_util_treeherder.py b/taskcluster/taskgraph/test/test_util_treeherder.py
new file mode 100644
index 0000000000..cf7513c00f
--- /dev/null
+++ b/taskcluster/taskgraph/test/test_util_treeherder.py
@@ -0,0 +1,23 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import absolute_import, print_function, unicode_literals
+
+import unittest
+from taskgraph.util.treeherder import split_symbol, join_symbol
+
+
+class TestSymbols(unittest.TestCase):
+
+    def test_split_no_group(self):
+        self.assertEqual(split_symbol('xy'), ('?', 'xy'))
+
+    def test_split_with_group(self):
+        self.assertEqual(split_symbol('ab(xy)'), ('ab', 'xy'))
+
+    def test_join_no_group(self):
+        self.assertEqual(join_symbol('?', 'xy'), 'xy')
+
+    def test_join_with_group(self):
+        self.assertEqual(join_symbol('ab', 'xy'), 'ab(xy)')