Each test runs a full repository creation and any subtree actions needed to perform the test. Each test starts with a clean slate, making debugging and post-mortem analysis much easier. Signed-off-by: Techlive Zheng <techlivezheng@gmail.com> Signed-off-by: David A. Greene <greened@obbligato.org> Signed-off-by: Jeff King <peff@peff.net>