1 files changed, 44 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/String/prototype/padEnd/observable-operations.js b/js/src/tests/test262/built-ins/String/prototype/padEnd/observable-operations.js
new file mode 100644
index 0000000000..6af105ca4b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padEnd/observable-operations.js
@@ -0,0 +1,44 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padend
+description: String#padEnd should perform observable operations in the correct order
+author: Jordan Harband
+---*/
+
+var log = "";
+
+function createPrimitiveObserver(name, string, value) {
+  return {
+    toString: function() {
+      log += '|toString:' + name;
+      return string;
+    },
+    valueOf: function() {
+      log += '|valueOf:' + name;
+      return value;
+    }
+  };
+};
+
+var receiver = createPrimitiveObserver('receiver', {}, 'abc');
+
+var fillString = createPrimitiveObserver('fillString', {}, 'def');
+
+var maxLength = createPrimitiveObserver('maxLength', 11, {});
+
+var result = String.prototype.padEnd.call(receiver, maxLength, fillString);
+
+assert.sameValue(result, 'abcdefdefde');
+
+assert.sameValue(log, '|' + [
+  'toString:receiver',
+  'valueOf:receiver',
+  'valueOf:maxLength',
+  'toString:maxLength',
+  'toString:fillString',
+  'valueOf:fillString'
+].join('|'), log);
+
+reportCompare(0, 0);