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-rw-r--r--js/src/tests/non262/generators/delegating-yield-8.js44
1 files changed, 44 insertions, 0 deletions
diff --git a/js/src/tests/non262/generators/delegating-yield-8.js b/js/src/tests/non262/generators/delegating-yield-8.js
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index 0000000000..c17d6ea26a
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+++ b/js/src/tests/non262/generators/delegating-yield-8.js
@@ -0,0 +1,44 @@
+// Test that yield* can appear in a loop, and alongside yield.
+
+function* countdown(n) {
+ while (n > 0) {
+ yield n;
+ yield* countdown(--n);
+ }
+ return 34;
+}
+
+function collect_results(iter) {
+ var ret = [];
+ var result;
+ do {
+ result = iter.next();
+ ret.push(result);
+ } while (!result.done);
+ return ret;
+}
+
+var expected = [
+ // yield in countdown(3), n == 3
+ {value: 3, done: false},
+ // yield in yield* countdown(2), n == 2
+ {value: 2, done: false},
+ // yield in nested yield* countdown(1), n == 1
+ {value: 1, done: false},
+ // countdown(0) yields no values
+ // second go-through of countdown(2) loop, n == 1
+ {value: 1, done: false},
+ // second go-through of countdown(3) loop, n == 2
+ {value: 2, done: false},
+ // yield in yield* countdown(1), n == 1
+ {value: 1, done: false},
+ // third go-through of countdown(3) loop, n == 1
+ {value: 1, done: false},
+ // done
+ {value: 34, done: true}
+];
+
+assertDeepEq(expected, collect_results(countdown(3)));
+
+if (typeof reportCompare == "function")
+ reportCompare(true, true);