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-rw-r--r--js/src/tests/ecma_6/Generators/delegating-yield-6.js56
1 files changed, 56 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Generators/delegating-yield-6.js b/js/src/tests/ecma_6/Generators/delegating-yield-6.js
new file mode 100644
index 000000000..8b358525c
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+++ b/js/src/tests/ecma_6/Generators/delegating-yield-6.js
@@ -0,0 +1,56 @@
+// Test that each yield* loop just checks "done", and "value" is only
+// fetched once at the end.
+
+var log = "";
+
+function collect_results(iter) {
+ var ret = [];
+ var result;
+ do {
+ result = iter.next();
+ ret.push(result);
+ } while (!result.done);
+ return ret;
+}
+
+function Iter(val, count) {
+ function next() {
+ log += 'n';
+ return {
+ get done() { log += "d"; return count-- == 0; },
+ get value() { log += "v"; return val; }
+ }
+ }
+
+ function iterator() {
+ log += 'i';
+ return this;
+ }
+
+ this.next = next;
+ this[Symbol.iterator] = iterator;
+}
+
+function* delegate(iter) { return yield* iter; }
+
+var inner = new Iter(42, 5);
+var outer = delegate(inner);
+
+// Five values, and one terminal value.
+outer.next();
+outer.next();
+outer.next();
+outer.next();
+outer.next();
+outer.next();
+
+assertEq(log, "indndndndndndv");
+
+// Outer's dead, man. Outer's dead.
+assertDeepEq(outer.next(), {value: undefined, done: true});
+
+// No more checking the iterator.
+assertEq(log, "indndndndndndv");
+
+if (typeof reportCompare == "function")
+ reportCompare(true, true);