1 files changed, 35 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/collections/WeakMap-constructor-3.js b/js/src/jit-test/tests/collections/WeakMap-constructor-3.js
new file mode 100644
index 000000000..ab18a2151
--- /dev/null
+++ b/js/src/jit-test/tests/collections/WeakMap-constructor-3.js
@@ -0,0 +1,35 @@
+// WeakMap can take an argument that is an array of singleton arrays.
+
+var k1 = {};
+var k2 = {};
+var k3 = {};
+
+var arr = [[k1], [k2]];
+
+var m = new WeakMap(arr);
+
+assertEq(m.has(k1), true);
+assertEq(m.has(k2), true);
+assertEq(m.has(k3), false);
+assertEq(m.get(k1), undefined);
+assertEq(m.get(k2), undefined);
+assertEq(m.get(k3), undefined);
+
+var arraylike1 = {
+  0: k1,
+  1: undefined
+};
+var arraylike2 = {
+  0: k2,
+};
+
+arr = [arraylike1, arraylike2];
+
+m = new WeakMap(arr);
+
+assertEq(m.has(k1), true);
+assertEq(m.has(k2), true);
+assertEq(m.has(k3), false);
+assertEq(m.get(k1), undefined);
+assertEq(m.get(k2), undefined);
+assertEq(m.get(k3), undefined);