1 files changed, 61 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/expressions/addition/coerce-symbol-to-prim-invocation.js b/js/src/tests/test262/language/expressions/addition/coerce-symbol-to-prim-invocation.js
new file mode 100644
index 0000000000..8e84913f02
--- /dev/null
+++ b/js/src/tests/test262/language/expressions/addition/coerce-symbol-to-prim-invocation.js
@@ -0,0 +1,61 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-addition-operator-plus-runtime-semantics-evaluation
+es6id: 12.7.3.1
+description: Invocation of `Symbol.toPrimitive` method during coercion
+info: |
+    [...]
+    5. Let lprim be ? ToPrimitive(lval).
+    6. Let rprim be ? ToPrimitive(rval).
+    [...]
+
+    ES6 Section 7.2.12 Abstract Equality Comparison
+
+    [...]
+    10. If Type(x) is either String, Number, or Symbol and Type(y) is Object,
+        then return the result of the comparison x == ToPrimitive(y).
+
+    ES6 Section 7.1.1 ToPrimitive ( input [, PreferredType] )
+
+    1. If PreferredType was not passed, let hint be "default".
+    [...]
+    4. Let exoticToPrim be GetMethod(input, @@toPrimitive).
+    5. ReturnIfAbrupt(exoticToPrim).
+    6. If exoticToPrim is not undefined, then
+       a. Let result be Call(exoticToPrim, input, «hint»).
+       [...]
+features: [Symbol.toPrimitive]
+---*/
+
+var left = {};
+var right = {};
+var log = '';
+var leftThisVal, rightThisVal, leftArgs, rightArgs;
+
+left[Symbol.toPrimitive] = function() {
+  log += 'left';
+  leftThisVal = this;
+  leftArgs = arguments;
+};
+
+right[Symbol.toPrimitive] = function() {
+  log += 'right';
+  rightThisVal = this;
+  rightArgs = arguments;
+};
+
+
+left + right;
+
+assert.sameValue(log, 'leftright', 'methods invoked in correct sequence');
+
+assert.sameValue(leftThisVal, left, 'left-hand side `this` value');
+assert.sameValue(leftArgs.length, 1, 'left-hand side argument length');
+assert.sameValue(leftArgs[0], 'default', 'left-hand side argument value');
+
+assert.sameValue(rightThisVal, right, 'right-hand side `this` value');
+assert.sameValue(rightArgs.length, 1, 'right-hand side argument length');
+assert.sameValue(rightArgs[0], 'default', 'right-hand side argument value');
+
+reportCompare(0, 0);