1 files changed, 67 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/RegExp/prototype/Symbol.search/lastindex-no-restore.js b/js/src/tests/test262/built-ins/RegExp/prototype/Symbol.search/lastindex-no-restore.js
new file mode 100644
index 0000000000..066d67da3e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/prototype/Symbol.search/lastindex-no-restore.js
@@ -0,0 +1,67 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 21.2.5.9
+description: Behavior when some lastIndex writes should be skipped.
+info: |
+    [...]
+    4. Let previousLastIndex be ? Get(rx, "lastIndex").
+    5. If SameValue(previousLastIndex, 0) is false, then
+       a. Perform ? Set(rx, "lastIndex", 0, true).
+    [...]
+    7. Let currentLastIndex be ? Get(rx, "lastIndex").
+    8. If SameValue(currentLastIndex, previousLastIndex) is false, then
+       a. Perform ? Set(rx, "lastIndex", previousLastIndex, true).
+    [...]
+features: [Symbol.search]
+---*/
+
+var lastIndexValue;
+var lastIndexValueAfterExec;
+var lastIndexReads;
+var lastIndexWrites;
+var execCallCount;
+var result;
+
+var fakeRe = {
+  get lastIndex() {
+    lastIndexReads++;
+    return lastIndexValue;
+  },
+  set lastIndex(_) {
+    lastIndexWrites++;
+    lastIndexValue = _;
+  },
+  exec: function() {
+    execCallCount++;
+    lastIndexValue = lastIndexValueAfterExec;
+    return null;
+  }
+};
+
+function reset(value, valueAfterExec) {
+  lastIndexValue = value;
+  lastIndexValueAfterExec = valueAfterExec;
+  lastIndexReads = 0;
+  lastIndexWrites = 0;
+  execCallCount = 0;
+}
+
+reset(0, 0);
+result = RegExp.prototype[Symbol.search].call(fakeRe);
+assert.sameValue(result, -1);
+assert.sameValue(lastIndexValue, 0);
+assert.sameValue(lastIndexReads, 2);
+assert.sameValue(lastIndexWrites, 0);
+assert.sameValue(execCallCount, 1);
+
+reset(420, 420);
+result = RegExp.prototype[Symbol.search].call(fakeRe);
+assert.sameValue(result, -1);
+assert.sameValue(lastIndexValue, 420);
+assert.sameValue(lastIndexReads, 2);
+assert.sameValue(lastIndexWrites, 1);
+assert.sameValue(execCallCount, 1);
+
+reportCompare(0, 0);