1 files changed, 54 insertions, 0 deletions
diff --git a/js/src/tests/test262/annexB/built-ins/escape/to-string-observe.js b/js/src/tests/test262/annexB/built-ins/escape/to-string-observe.js
new file mode 100644
index 0000000000..c9dcd49f99
--- /dev/null
+++ b/js/src/tests/test262/annexB/built-ins/escape/to-string-observe.js
@@ -0,0 +1,54 @@
+// 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-escape-string
+es6id: B.2.1.1
+description: Observable operations from string coercion
+info: |
+    1. Let string be ? ToString(string).
+---*/
+
+var log, obj;
+
+log = '';
+obj = {
+  toString: function() {
+    log += 'toString';
+  },
+  valueOf: function() {
+    log += 'valueOf';
+  }
+};
+
+escape(obj);
+
+assert.sameValue(log, 'toString');
+
+log = '';
+obj = {
+  toString: null,
+  valueOf: function() {
+    log += 'valueOf';
+  }
+};
+
+escape(obj);
+
+assert.sameValue(log, 'valueOf');
+
+log = '';
+obj = {
+  toString: function() {
+    log += 'toString';
+    return {};
+  },
+  valueOf: function() {
+    log += 'valueOf';
+  }
+};
+
+escape(obj);
+
+assert.sameValue(log, 'toStringvalueOf');
+
+reportCompare(0, 0);