1 files changed, 63 insertions, 0 deletions
diff --git a/python/mozversioncontrol/test/test_update.py b/python/mozversioncontrol/test/test_update.py
new file mode 100644
index 0000000000..91c7469ee5
--- /dev/null
+++ b/python/mozversioncontrol/test/test_update.py
@@ -0,0 +1,63 @@
+# 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 subprocess import CalledProcessError
+
+import mozunit
+import pytest
+
+from mozversioncontrol import get_repository_object
+
+STEPS = {
+    "hg": [
+        """
+        echo "bar" >> bar
+        echo "baz" > foo
+        hg commit -m "second commit"
+        """,
+        """
+        echo "foobar" > foo
+        """,
+    ],
+    "git": [
+        """
+        echo "bar" >> bar
+        echo "baz" > foo
+        git add *
+        git commit -m "second commit"
+        """,
+        """
+        echo "foobar" > foo
+        """,
+    ],
+}
+
+
+def test_update(repo):
+    vcs = get_repository_object(repo.dir)
+    rev0 = vcs.head_ref
+
+    repo.execute_next_step()
+    rev1 = vcs.head_ref
+    assert rev0 != rev1
+
+    if repo.vcs == "hg":
+        vcs.update(".~1")
+    else:
+        vcs.update("HEAD~1")
+    assert vcs.head_ref == rev0
+
+    vcs.update(rev1)
+    assert vcs.head_ref == rev1
+
+    # Update should fail with dirty working directory.
+    repo.execute_next_step()
+    with pytest.raises(CalledProcessError):
+        vcs.update(rev0)
+
+    assert vcs.head_ref == rev1
+
+
+if __name__ == "__main__":
+    mozunit.main()