[gtk-doc] common: add another test

[Stefan Sauer <stefkost src gnome org>]

commit 803586a9862296e1929c116c3b5af62860cb77be
Author: Stefan Sauer <ensonic users sf net>
Date:   Thu Apr 13 21:33:03 2017 +0200

    common: add another test

 tests/gtkdoc-common.py |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/tests/gtkdoc-common.py b/tests/gtkdoc-common.py
index ee3a1ac..6f5969a 100755
--- a/tests/gtkdoc-common.py
+++ b/tests/gtkdoc-common.py
@@ -17,6 +17,14 @@ class TestUpdateFileIfChanged(unittest.TestCase):
         self.assertTrue(res)
 
 
+class TestGetModuleDocDir(unittest.TestCase):
+
+    @mock.patch('subprocess.check_output')
+    def test_ReturnsPath(self, subprocess_check_output):
+        subprocess_check_output.return_value = '/usr'
+        self.assertEquals(common.GetModuleDocDir('glib-2.0'), '/usr/share/gtk-doc/html')
+
+
 class TestCreateValidSGMLID(unittest.TestCase):
 
     def test_AlreadyValid(self):