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diff --git a/js/src/jit-test/tests/debug/Memory-takeCensus-02.js b/js/src/jit-test/tests/debug/Memory-takeCensus-02.js
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+// Debugger.Memory.prototype.takeCensus behaves plausibly as we allocate objects.
+
+// Exact object counts vary in ways we can't predict. For example,
+// BaselineScripts can hold onto "template objects", which exist only to hold
+// the shape and type for newly created objects. When BaselineScripts are
+// discarded, these template objects go with them.
+//
+// So instead of expecting precise counts, we expect counts that are at least as
+// many as we would expect given the object graph we've built.
+
+load(libdir + 'census.js');
+
+// A Debugger with no debuggees had better not find anything.
+var dbg = new Debugger;
+var census0 = dbg.memory.takeCensus();
+Census.walkCensus(census0, "census0", Census.assertAllZeros);
+
+function newGlobalWithDefs() {
+ var g = newGlobal();
+ g.eval(`
+ function times(n, fn) {
+ var a=[];
+ for (var i = 0; i<n; i++)
+ a.push(fn());
+ return a;
+ }`);
+ return g;
+}
+
+// Allocate a large number of various types of objects, and check that census
+// finds them.
+var g = newGlobalWithDefs();
+dbg.addDebuggee(g);
+
+g.eval('var objs = times(100, () => ({}));');
+g.eval('var rxs = times(200, () => /foo/);');
+g.eval('var ars = times(400, () => []);');
+g.eval('var fns = times(800, () => () => {});');
+
+var census1 = dbg.memory.takeCensus();
+Census.walkCensus(census1, "census1",
+ Census.assertAllNotLessThan(
+ { 'objects':
+ { 'Object': { count: 100 },
+ 'RegExp': { count: 200 },
+ 'Array': { count: 400 },
+ 'Function': { count: 800 }
+ }
+ }));