From 252ab8ce7296c205d67d7c875582464d65eebbf6 Mon Sep 17 00:00:00 2001
From: Jussi Kukkonen <jku@goto.fi>
Date: Thu, 5 Sep 2019 14:23:02 +0300
Subject: [PATCH] react: Test removing callback from nonexistent cell

RemoveCallbackError::NonexistentCell was not tested yet, add new test.

Fixes #465
---
 exercises/react/tests/react.rs | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/exercises/react/tests/react.rs b/exercises/react/tests/react.rs
index cd26a361e..90eeef283 100644
--- a/exercises/react/tests/react.rs
+++ b/exercises/react/tests/react.rs
@@ -191,6 +191,30 @@ fn error_adding_callback_to_nonexistent_cell() {
     );
 }
 
+#[test]
+#[ignore]
+fn error_removing_callback_from_nonexisting_cell() {
+    let mut dummy_reactor = Reactor::new();
+    let dummy_input = dummy_reactor.create_input(1);
+    let _ = dummy_reactor
+        .create_compute(&[CellID::Input(dummy_input)], |_| 0)
+        .unwrap();
+    let dummy_output = dummy_reactor
+        .create_compute(&[CellID::Input(dummy_input)], |_| 0)
+        .unwrap();
+
+    let mut reactor = Reactor::new();
+    let input = reactor.create_input(1);
+    let output = reactor
+        .create_compute(&[CellID::Input(input)], |_| 0)
+        .unwrap();
+    let callback = reactor.add_callback(output, |_| ()).unwrap();
+    assert_eq!(
+        reactor.remove_callback(dummy_output, callback),
+        Err(RemoveCallbackError::NonexistentCell)
+    );
+}
+
 #[test]
 #[ignore]
 fn callbacks_only_fire_on_change() {