michael@0: var key = {};
michael@0: var wm = WeakMap();
michael@0: 
michael@0: assertEq(wm.has(key), false);
michael@0: // Clearing an already empty WeakMap
michael@0: wm.clear();
michael@0: assertEq(wm.has(key), false);
michael@0: 
michael@0: // Clearing a WeakMap with a live key
michael@0: wm.set(key, 42);
michael@0: assertEq(wm.has(key), true);
michael@0: wm.clear();
michael@0: assertEq(wm.has(key), false);
michael@0: 
michael@0: // Clearing a WeakMap with keys turned to garbage
michael@0: wm.set(key, {});
michael@0: for (var i = 0; i < 10; i++)
michael@0:     wm.set({}, {});
michael@0: assertEq(wm.has(key), true);
michael@0: wm.clear();
michael@0: assertEq(wm.has(key), false);
michael@0: 
michael@0: // Clearing a WeakMap with keys turned to garbage and after doing a GC
michael@0: wm.set(key, {});
michael@0: for (var i = 0; i < 10; i++)
michael@0:     wm.set({}, {});
michael@0: assertEq(wm.has(key), true);
michael@0: gc();
michael@0: assertEq(wm.has(key), true);
michael@0: wm.clear();
michael@0: assertEq(wm.has(key), false);
michael@0: 
michael@0: // More testing when the key is no longer live
michael@0: wm.set(key, {});
michael@0: key = null;
michael@0: wm.clear();
michael@0: gc();
michael@0: var key2 = {};
michael@0: wm.set(key2, {});
michael@0: key2 = null;
michael@0: gc();
michael@0: wm.clear();