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-rw-r--r--js/src/tests/ecma_6/Generators/delegating-yield-9.js37
1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Generators/delegating-yield-9.js b/js/src/tests/ecma_6/Generators/delegating-yield-9.js
new file mode 100644
index 000000000..60c35b94d
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+++ b/js/src/tests/ecma_6/Generators/delegating-yield-9.js
@@ -0,0 +1,37 @@
+// Test that yield* can appear in a loop, and inside yield.
+
+function* countdown(n) {
+ while (n > 0) {
+ yield (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 = [
+ // Only 34 yielded from the "yield" and the last return make it out.
+ // Three yields in countdown(3), two in countdown(2), and one in
+ // countdown(1) (called twice).
+ {value: 34, done: false},
+ {value: 34, done: false},
+ {value: 34, done: false},
+ {value: 34, done: false},
+ {value: 34, done: false},
+ {value: 34, done: false},
+ {value: 34, done: false},
+ {value: 34, done: true}, // final
+];
+
+assertDeepEq(collect_results(countdown(3)), expected);
+
+if (typeof reportCompare == "function")
+ reportCompare(true, true);