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diff --git a/js/src/jit-test/tests/debug/Memory-takeCensus-08.js b/js/src/jit-test/tests/debug/Memory-takeCensus-08.js
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+// Debugger.Memory.prototype.takeCensus: test by: 'count' breakdown
+
+let g = newGlobal();
+let dbg = new Debugger(g);
+
+g.eval(`
+ var stuff = [];
+ function add(n, c) {
+ for (let i = 0; i < n; i++)
+ stuff.push(c());
+ }
+
+ let count = 0;
+
+ function obj() { return { count: count++ }; }
+ obj.factor = 1;
+
+ // This creates a closure (a function JSObject) that has captured
+ // a Call object. So each call creates two items.
+ function fun() { let v = count; return () => { return v; } }
+ fun.factor = 2;
+
+ function str() { return 'perambulator' + count++; }
+ str.factor = 1;
+
+ // Eval a fresh text each time, allocating:
+ // - a fresh ScriptSourceObject
+ // - a new JSScripts, not an eval cache hits
+ // - a fresh prototype object
+ // - a fresh Call object, since the eval makes 'ev' heavyweight
+ // - the new function itself
+ function ev() {
+ return eval(\`(function () { return \${ count++ } })\`);
+ }
+ ev.factor = 5;
+
+ // A new object (1) with a new shape (2) with a new atom (3)
+ function shape() { return { [ 'theobroma' + count++ ]: count }; }
+ shape.factor = 3;
+ `);
+
+let baseline = 0;
+function countIncreasedByAtLeast(n) {
+ let oldBaseline = baseline;
+
+ // Since a census counts only reachable objects, one might assume that calling
+ // GC here would have no effect on the census results. But GC also throws away
+ // JIT code and any objects it might be holding (template objects, say);
+ // takeCensus reaches those. Shake everything loose that we can, to make the
+ // census approximate reachability a bit more closely, and make our results a
+ // bit more predictable.
+ gc(g, 'shrinking');
+
+ baseline = dbg.memory.takeCensus({ breakdown: { by: 'count' } }).count;
+ return baseline >= oldBaseline + n;
+}
+
+countIncreasedByAtLeast(0);
+
+g.add(100, g.obj);
+assertEq(countIncreasedByAtLeast(g.obj.factor * 100), true);
+
+g.add(100, g.fun);
+assertEq(countIncreasedByAtLeast(g.fun.factor * 100), true);
+
+g.add(100, g.str);
+assertEq(countIncreasedByAtLeast(g.str.factor * 100), true);
+
+g.add(100, g.ev);
+assertEq(countIncreasedByAtLeast(g.ev.factor * 100), true);
+
+g.add(100, g.shape);
+assertEq(countIncreasedByAtLeast(g.shape.factor * 100), true);