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-rw-r--r--js/src/tests/ecma_6/Generators/delegating-yield-5.js37
1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Generators/delegating-yield-5.js b/js/src/tests/ecma_6/Generators/delegating-yield-5.js
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index 000000000..f4376743b
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+++ b/js/src/tests/ecma_6/Generators/delegating-yield-5.js
@@ -0,0 +1,37 @@
+// Test that a deep yield* chain re-yields received results without
+// re-boxing.
+
+function results(results) {
+ var i = 0;
+ function next() {
+ return results[i++];
+ }
+ var iter = { next: next };
+ var ret = {};
+ ret[Symbol.iterator] = function () { return iter; }
+ return ret;
+}
+
+function* yield_results(expected, n) {
+ return yield* n ? yield_results(expected, n - 1) : results(expected);
+}
+
+function collect_results(iterable) {
+ var ret = [];
+ var result;
+ var iter = iterable[Symbol.iterator]();
+ do {
+ result = iter.next();
+ ret.push(result);
+ } while (!result.done);
+ return ret;
+}
+
+// We have to put a full result for the end, because the return will re-box.
+var expected = [{value: 1}, {value: 34, done: true}];
+
+assertDeepEq(expected, collect_results(results(expected)));
+assertDeepEq(expected, collect_results(yield_results(expected, 20)));
+
+if (typeof reportCompare == "function")
+ reportCompare(true, true);