diff -r 000000000000 -r 6474c204b198 testing/mozbase/mozversion/tests/test_sources.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testing/mozbase/mozversion/tests/test_sources.py	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,75 @@
+#!/usr/bin/env python
+
+# 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/.
+
+import os
+import tempfile
+import unittest
+
+import mozfile
+from mozversion import get_version
+
+
+class SourcesTest(unittest.TestCase):
+    """test getting version information from a sources xml"""
+
+    application_ini = """[App]\nName = B2G\n"""
+    sources_xml = """<?xml version="1.0" ?><manifest>
+  <project path="build" revision="build_revision" />
+  <project path="gaia" revision="gaia_revision" />
+  <project path="gecko" revision="gecko_revision" />
+</manifest>
+"""
+
+    def setUp(self):
+        self.cwd = os.getcwd()
+        self.tempdir = tempfile.mkdtemp()
+
+        self.binary = os.path.join(self.tempdir, 'binary')
+        with open(self.binary, 'w') as f:
+            f.write('foobar')
+
+    def tearDown(self):
+        os.chdir(self.cwd)
+        mozfile.remove(self.tempdir)
+
+    def test_sources(self):
+        with open(os.path.join(self.tempdir, 'application.ini'), 'w') as f:
+            f.writelines(self.application_ini)
+
+        sources = os.path.join(self.tempdir, 'sources.xml')
+        with open(sources, 'w') as f:
+            f.writelines(self.sources_xml)
+
+        os.chdir(self.tempdir)
+        self._check_version(get_version(sources=sources))
+
+    def test_sources_in_current_directory(self):
+        with open(os.path.join(self.tempdir, 'application.ini'), 'w') as f:
+            f.writelines(self.application_ini)
+
+        with open(os.path.join(self.tempdir, 'sources.xml'), 'w') as f:
+            f.writelines(self.sources_xml)
+
+        os.chdir(self.tempdir)
+        self._check_version(get_version())
+
+    def test_invalid_sources_path(self):
+        v = get_version(self.binary, os.path.join(self.tempdir, 'invalid'))
+        self.assertEqual(v, {})
+
+    def test_missing_sources_file(self):
+        v = get_version(self.binary)
+        self.assertEqual(v, {})
+
+    def _check_version(self, version):
+        self.assertEqual(version.get('build_changeset'), 'build_revision')
+        self.assertEqual(version.get('gaia_changeset'), 'gaia_revision')
+        self.assertEqual(version.get('gecko_changeset'), 'gecko_revision')
+        self.assertIsNone(version.get('invalid_key'))
+
+
+if __name__ == '__main__':
+    unittest.main()