feat: add tests and default exit code for kill() on ChildProcess

crates/lune-std-process/src/lib.rs

@@ -234,11 +234,9 @@ fn process_create(
         .with_async_function("status", move |lua, ()| {
             let code_rx_rc_clone = Rc::clone(&code_rx_rc);
             async move {
-                let code = code_rx_rc_clone
-                    .borrow_mut()
-                    .recv()
-                    .await
-                    .expect("Code sender unexpectedly dropped");
+                // Exit code of 9 corresponds to SIGKILL, which should be the only case where
+                // the receiver gets suddenly dropped
+                let code = code_rx_rc_clone.borrow_mut().recv().await.unwrap_or(9);
 
                 TableBuilder::new(lua)?
                     .with_value("code", code)?

tests/process/create/kill.luau

@@ -0,0 +1,21 @@
+local process = require("@lune/process")
+
+-- Killing a child process should work as expected
+
+local message = "Hello, world!"
+local child = process.create("cat")
+
+child.stdin:write(message)
+child.kill()
+
+assert(child.status().code == 9, "Child process should have an exit code of 9 (SIGKILL)")
+
+assert(
+	child.stdout:readToEnd() == message,
+	"Reading from stdout of child process should work even after kill"
+)
+
+local stdinWriteOk = pcall(function()
+	child.stdin:write(message)
+end)
+assert(not stdinWriteOk, "Writing to stdin of child process should not work after kill")