1 files changed, 43 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/toString-this-val.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/toString-this-val.js
new file mode 100644
index 0000000000..6652e29f06
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/toString-this-val.js
@@ -0,0 +1,43 @@
+// Copyright (C) 2018 Peter Wong. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: |
+  Verify ToString is called when regexp[@@matchAll] is undefined or null
+info: |
+  String.prototype.matchAll ( regexp )
+    1. Let O be ? RequireObjectCoercible(this value).
+    2. If regexp is neither undefined nor null, then
+      a. Let matcher be ? GetMethod(regexp, @@matchAll).
+      b. If matcher is not undefined, then
+        [...]
+    3. Let S be ? ToString(O).
+    4. Let rx be ? RegExpCreate(R, "g").
+    5. Return ? Invoke(rx, @@matchAll, « S »).
+features: [Symbol.matchAll, String.prototype.matchAll]
+---*/
+
+var regexp = /./;
+var callCount = 0;
+var arg;
+var obj = {};
+var toStringResult = 'abc';
+var receiver = {
+  [Symbol.toPrimitive]: function() {
+    callCount++;
+    return toStringResult;
+  }
+};
+RegExp.prototype[Symbol.matchAll] = function(string) {
+  arg = string;
+};
+
+String.prototype.matchAll.call(receiver, null);
+assert.sameValue(callCount, 1);
+assert.sameValue(arg, toStringResult);
+
+String.prototype.matchAll.call(receiver, undefined);
+assert.sameValue(callCount, 2);
+assert.sameValue(arg, toStringResult);
+
+reportCompare(0, 0);