From f86deef5b6059b9a0a76d9f0dafb95ced85f7449 Mon Sep 17 00:00:00 2001
From: Stjepan Glavina <stjepang@gmail.com>
Date: Fri, 6 Apr 2018 15:02:21 +0200
Subject: Add Cell::update

---
 src/libcore/tests/cell.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'src/libcore/tests')

diff --git a/src/libcore/tests/cell.rs b/src/libcore/tests/cell.rs
index cc0ef6a6f17..962fb2f0e02 100644
--- a/src/libcore/tests/cell.rs
+++ b/src/libcore/tests/cell.rs
@@ -26,6 +26,17 @@ fn smoketest_cell() {
     assert!(y.get() == (30, 40));
 }
 
+#[test]
+fn cell_update() {
+    let x = Cell::new(10);
+
+    assert_eq!(x.update(|x| x + 5), 15);
+    assert_eq!(x.get(), 15);
+
+    assert_eq!(x.update(|x| x / 3), 5);
+    assert_eq!(x.get(), 5);
+}
+
 #[test]
 fn cell_has_sensible_show() {
     let x = Cell::new("foo bar");
-- 
cgit 1.4.1-3-g733a5