1 files changed, 28 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/collections/WeakMap-constructor-iterable.js b/js/src/jit-test/tests/collections/WeakMap-constructor-iterable.js
new file mode 100644
index 000000000..f5eac8e30
--- /dev/null
+++ b/js/src/jit-test/tests/collections/WeakMap-constructor-iterable.js
@@ -0,0 +1,28 @@
+// The argument to WeakMap can be a iterable object.
+
+load(libdir + "iteration.js");
+
+var k1 = {};
+var v1 = 42;
+var k2 = {};
+var v2 = 43;
+var k3 = {};
+
+var done = false;
+
+var iterable = {};
+iterable[Symbol.iterator] = function*() {
+  yield [k1, v1];
+  yield [k2, v2];
+  done = true;
+};
+var m = new WeakMap(iterable);
+
+assertEq(done, true);  // the constructor consumes the argument
+assertEq(m.has(k1), true);
+assertEq(m.has(k2), true);
+assertEq(m.has(k3), false);
+assertEq(m.get(k1), v1);
+assertEq(m.get(k2), v2);
+assertEq(m.get(k3), undefined);
+