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     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/js/src/tests/ecma_6/Generators/delegating-yield-1.js	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,42 @@
     1.4 +// This file was written by Andy Wingo <wingo@igalia.com> and originally
     1.5 +// contributed to V8 as generators-objects.js, available here:
     1.6 +//
     1.7 +// http://code.google.com/p/v8/source/browse/branches/bleeding_edge/test/mjsunit/harmony/generators-objects.js
     1.8 +
     1.9 +// Test that yield* re-yields received results without re-boxing.
    1.10 +
    1.11 +function results(results) {
    1.12 +    var i = 0;
    1.13 +    function next() {
    1.14 +        return results[i++];
    1.15 +    }
    1.16 +    var iter = { next: next }
    1.17 +    var ret = {};
    1.18 +    ret[std_iterator] = function () { return iter; }
    1.19 +    return ret;
    1.20 +}
    1.21 +
    1.22 +function* yield_results(expected) {
    1.23 +    return yield* results(expected);
    1.24 +}
    1.25 +
    1.26 +function collect_results(iterable) {
    1.27 +    var ret = [];
    1.28 +    var result;
    1.29 +    var iter = iterable[std_iterator]();
    1.30 +    do {
    1.31 +        result = iter.next();
    1.32 +        ret.push(result);
    1.33 +    } while (!result.done);
    1.34 +    return ret;
    1.35 +}
    1.36 +
    1.37 +// We have to put a full result for the end, because the return will re-box.
    1.38 +var expected = [{value: 1}, 13, "foo", {value: 34, done: true}];
    1.39 +
    1.40 +// Sanity check.
    1.41 +assertDeepEq(expected, collect_results(results(expected)));
    1.42 +assertDeepEq(expected, collect_results(yield_results(expected)));
    1.43 +
    1.44 +if (typeof reportCompare == "function")
    1.45 +    reportCompare(true, true);