diff --git a/github/tests/Commit.py b/github/tests/Commit.py
index <HASH>..<HASH> 100644
--- a/github/tests/Commit.py
+++ b/github/tests/Commit.py
@@ -54,6 +54,7 @@ class Commit(Framework.TestCase):
         self.assertEqual(self.commit.stats.additions, 0)
         self.assertEqual(self.commit.stats.total, 20)
         self.assertEqual(self.commit.url, "https://api.github.com/repos/jacquev6/PyGithub/commits/1292bf0e22c796e91cc3d6e24b544aece8c21f2a")
+        self.assertEqual(self.commit.commit.tree.sha, "4c6bd50994f0f9823f898b1c6c964ad7d4fa11ab")
 
         # test __repr__() based on this attributes
         self.assertEqual(self.commit.__repr__(), 'Commit(sha="1292bf0e22c796e91cc3d6e24b544aece8c21f2a")')
Add unit test for tree attribute of GitCommit (#<I>)