Diffusion Ant (master) Code

ant/tests/test_define_property_shape_slot.cjs
457d5953e6c8master

test_define_property_shape_slot.cjs
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			function assert(cond, msg) {
			if (!cond) throw new Error(msg);
			}

			function assertEq(actual, expected, msg) {
			if (actual !== expected) {
			throw new Error(msg + " (expected " + expected + ", got " + actual + ")");
			}
			}

			console.log("defineProperty shape-slot regression");

			console.log("\nTest 1: repeated fresh data-property definitions on one object");
			{
			const obj = {};
			for (let i = 0; i < 64; i++) {
			Object.defineProperty(obj, "p" + i, {
			value: i,
			writable: true,
			enumerable: true,
			configurable: true,
			});
			}

			let sum = 0;
			for (let i = 0; i < 64; i++) sum += obj["p" + i];
			assertEq(sum, (63 * 64) / 2, "all fresh data properties should be readable");
			assertEq(Object.keys(obj).length, 64, "all enumerable fresh properties should be visible");
			}
			console.log("PASS");

			console.log("\nTest 2: fresh non-enumerable property should not leak into keys");
			{
			const obj = {};
			Object.defineProperty(obj, "hidden", {
			value: 123,
			enumerable: false,
			configurable: true,
			writable: true,
			});
			obj.visible = 456;

			assertEq(obj.hidden, 123, "hidden property should be readable");
			assertEq(obj.visible, 456, "normal property should still work");
			assertEq(Object.keys(obj).length, 1, "only visible should appear in keys");
			assertEq(Object.keys(obj)[0], "visible", "visible key should be preserved");
			}
			console.log("PASS");

			console.log("\nTest 3: fresh accessor descriptors should keep getter/setter semantics");
			{
			const obj = {};
			let backing = 10;

			Object.defineProperty(obj, "value", {
			get() { return backing + 1; },
			set(v) { backing = v * 2; },
			enumerable: true,
			configurable: true,
			});

			assertEq(obj.value, 11, "fresh getter should be active");
			obj.value = 7;
			assertEq(backing, 14, "fresh setter should be active");
			assertEq(obj.value, 15, "getter should still observe updated backing");
			}
			console.log("PASS");

			console.log("\nTest 4: repeated fresh defineProperty on many objects");
			{
			let total = 0;
			for (let i = 0; i < 2000; i++) {
			const obj = {};
			Object.defineProperty(obj, "x", {
			value: i,
			writable: true,
			enumerable: true,
			configurable: true,
			});
			Object.defineProperty(obj, "y", {
			value: i + 1,
			writable: true,
			enumerable: false,
			configurable: true,
			});
			total += obj.x + obj.y;
			assertEq(Object.keys(obj).length, 1, "fresh per-object enumerable shape should stay correct");
			}

			assert(total > 0, "loop total should accumulate");
			}
			console.log("PASS");

			console.log("\nTest 5: defining then redefining adjacent fresh slots");
			{
			const obj = {};
			Object.defineProperty(obj, "a", {
			value: 1,
			writable: true,
			enumerable: true,
			configurable: true,
			});
			Object.defineProperty(obj, "b", {
			value: 2,
			writable: true,
			enumerable: true,
			configurable: true,
			});
			Object.defineProperty(obj, "a", {
			value: 10,
			writable: true,
			enumerable: true,
			configurable: true,
			});

			assertEq(obj.a, 10, "redefining earlier property should not corrupt later fresh slot");
			assertEq(obj.b, 2, "later fresh slot should remain intact");
			}
			console.log("PASS");

			console.log("\nAll shape-slot regression tests passed");

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