tokio-test: add tokio_test::io mock builder

tokio-test/src/lib.rs

@@ -20,7 +20,17 @@
 //! assert_ready!(fut.poll());
 //! ```
 
+macro_rules! ready {
+    ($e:expr) => {
+        match $e {
+            ::std::task::Poll::Ready(t) => t,
+            ::std::task::Poll::Pending => return ::std::task::Poll::Pending,
+        }
+    };
+}
+
 pub mod clock;
+pub mod io;
 mod macros;
 pub mod task;