1 files changed, 29 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Atomics/store/expected-return-value-negative-zero.js b/js/src/tests/test262/built-ins/Atomics/store/expected-return-value-negative-zero.js
new file mode 100644
index 0000000000..fafd84cb38
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/store/expected-return-value-negative-zero.js
@@ -0,0 +1,29 @@
+// |reftest| skip-if(!this.hasOwnProperty('Atomics')||!this.hasOwnProperty('SharedArrayBuffer')||(this.hasOwnProperty('getBuildConfiguration')&&getBuildConfiguration('arm64-simulator'))) -- Atomics,SharedArrayBuffer is not enabled unconditionally, ARM64 Simulator cannot emulate atomics
+// Copyright (C) 2020 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.store
+description: >
+  Atomics.store calls ToInteger, which normalizes -0 to +0
+features: [Atomics, SharedArrayBuffer, TypedArray]
+---*/
+
+const i32a = new Int32Array(
+  new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * 4)
+);
+
+assert(
+  Object.is(
+    Atomics.store(i32a, 0, -0),
+    +0
+  ),
+  'Atomics.store(i32a, 0, -0) normalizes -0 to +0'
+);
+assert.sameValue(
+  i32a[0],
+  +0,
+  'The value of i32a[0] is normalized to +0'
+);
+
+reportCompare(0, 0);