1 files changed, 60 insertions, 0 deletions
diff --git a/tests/ui/process/try-wait.rs b/tests/ui/process/try-wait.rs
new file mode 100644
index 00000000000..692197210b1
--- /dev/null
+++ b/tests/ui/process/try-wait.rs
@@ -0,0 +1,60 @@
+// run-pass
+
+#![allow(stable_features)]
+// ignore-emscripten no processes
+// ignore-sgx no processes
+
+#![feature(process_try_wait)]
+
+use std::env;
+use std::process::Command;
+use std::thread;
+use std::time::Duration;
+
+fn main() {
+    let args = env::args().collect::<Vec<_>>();
+    if args.len() != 1 {
+        match &args[1][..] {
+            "sleep" => thread::sleep(Duration::new(1_000, 0)),
+            _ => {}
+        }
+        return
+    }
+
+    let mut me = Command::new(env::current_exe().unwrap())
+                         .arg("sleep")
+                         .spawn()
+                         .unwrap();
+    let maybe_status = me.try_wait().unwrap();
+    assert!(maybe_status.is_none());
+    let maybe_status = me.try_wait().unwrap();
+    assert!(maybe_status.is_none());
+
+    me.kill().unwrap();
+    me.wait().unwrap();
+
+    let status = me.try_wait().unwrap().unwrap();
+    assert!(!status.success());
+    let status = me.try_wait().unwrap().unwrap();
+    assert!(!status.success());
+
+    let mut me = Command::new(env::current_exe().unwrap())
+                         .arg("return-quickly")
+                         .spawn()
+                         .unwrap();
+    loop {
+        match me.try_wait() {
+            Ok(Some(res)) => {
+                assert!(res.success());
+                break
+            }
+            Ok(None) => {
+                thread::sleep(Duration::from_millis(1));
+            }
+            Err(e) => panic!("error in try_wait: {}", e),
+        }
+    }
+
+    let status = me.try_wait().unwrap().unwrap();
+    assert!(status.success());
+}