src/third_party/mozjs-45/js/src/jit-test/tests/debug/Debugger-findObjects-05.js

// findObjects' result doesn't include any duplicates.

var g = newGlobal();
var dbg = new Debugger();
dbg.addDebuggee(g);

let objects = dbg.findObjects();
let set = new Set(objects);

assertEq(objects.length, set.size);