Add stop-test on ChildMonitor

1 files changed, 8 insertions, 0 deletions

diff --git a/src/process/monitor.rs b/src/process/monitor.rs
index 8caac5cc79..83390b7a34 100644
--- a/src/process/monitor.rs
+++ b/src/process/monitor.rs
@@ -256,4 +256,12 @@ mod child_monitor {
         assert!(testee.stop().is_ok());
         assert_event!(rx, Ok(true));
     }
+
+    #[test]
+    fn stop_without_start() {
+        let spawner = MockChildSpawner::new(Some(MockChild::alive_until_kill()));
+        let testee = ChildMonitor::new(spawner);
+
+        assert_matches!(testee.stop(), Err(Error(ErrorKind::InvalidState, _)));
+    }
 }