Fix exit_status example

In the example in the documentation that calls exit_status and in the
smoke integration test exit_status is called before the channel is
closed and it will therefore always return Ok(0).

I have fixed this by calling wait_close() first and by adding a
bad_smoke test that calls false and checks that the exit_status is 1.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/lib.rs b/src/lib.rs
index 580d5d6..9a81cc7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -80,6 +80,7 @@
 //! let mut s = String::new();
 //! channel.read_to_string(&mut s).unwrap();
 //! println!("{}", s);
+//! channel.wait_close();
 //! println!("{}", channel.exit_status().unwrap());
 //! ```
 //!