src/third_party/mozjs-45/js/src/jit-test/tests/collections/Set-clear-3.js

// Clearing a Set with a nontrivial number of elements works.

var s = new Set();
for (var i = 0; i < 100; i++)
    s.add(i);
assertEq(s.size, i);
s.clear();
assertEq(s.size, 0);
s.add(12);
assertEq(s.has(12), true);