Diffusion Ant (feature/nursery) Code

ant/tests/test-coercion-matrix.js
ddfe6237cab5feature/nursery

test-coercion-matrix.js
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			// ============================================
			// TEST: String coercion comparison matrix
			// ============================================
			// Compares: concat, template, String(), toString()
			// ============================================

			console.log("=== STRING COERCION MATRIX ===\n");

			function safe(fn) {
			try {
			const result = fn();
			if (result === undefined) return "undefined";
			if (result === null) return "null";
			return result;
			} catch (e) {
			return "ERROR:" + e.name;
			}
			}

			function test(name, value) {
			console.log(name + ":");
			console.log(" concat: " + safe(function() { return "" + value; }));
			console.log(" template: " + safe(function() { return `${value}`; }));
			console.log(" String(): " + safe(function() { return String(value); }));
			if (value !== null && value !== undefined) {
			console.log(" toString: " + safe(function() { return value.toString(); }));
			}
			console.log("");
			}

			// Primitives
			console.log("--- PRIMITIVES ---\n");
			test("number 42", 42);
			test("number 0", 0);
			test("number -1", -1);
			test("number NaN", NaN);
			test("number Infinity", Infinity);
			test("string 'hello'", "hello");
			test("string ''", "");
			test("boolean true", true);
			test("boolean false", false);
			test("null", null);
			test("undefined", undefined);
			test("BigInt 123n", 123n);

			// Symbol
			console.log("--- SYMBOL ---\n");
			test("Symbol('test')", Symbol("test"));

			// Arrays
			console.log("--- ARRAYS ---\n");
			test("[]", []);
			test("[1, 2, 3]", [1, 2, 3]);
			test("[[1,2], [3,4]]", [[1, 2], [3, 4]]);
			test("[null, undefined]", [null, undefined]);
			test("['a', 'b']", ["a", "b"]);

			// Functions
			console.log("--- FUNCTIONS ---\n");
			test("() => 1", () => 1);
			test("function() {}", function() {});
			function namedFn() { return 1; }
			test("named function", namedFn);
			test("async () => 1", async () => 1);

			// Objects
			console.log("--- OBJECTS ---\n");
			test("{}", {});
			test("{ a: 1 }", { a: 1 });
			test("{ a: 1, b: 2 }", { a: 1, b: 2 });

			// Built-in objects
			console.log("--- BUILT-IN OBJECTS ---\n");
			test("new Date(0)", new Date(0));
			test("new Date()", new Date());
			test("/test/gi", /test/gi);
			test("new Error('oops')", new Error("oops"));
			test("new TypeError('bad')", new TypeError("bad"));
			test("new Map([['a',1]])", new Map([["a", 1]]));
			test("new Set([1,2,3])", new Set([1, 2, 3]));
			test("new WeakMap()", new WeakMap());
			test("new WeakSet()", new WeakSet());
			test("new ArrayBuffer(8)", new ArrayBuffer(8));
			test("new Uint8Array([1,2])", new Uint8Array([1, 2]));
			test("Promise.resolve(1)", Promise.resolve(1));

			// Custom toString
			console.log("--- CUSTOM toString (CRASH TESTS) ---\n");

			console.log("native toString (should work):");
			test("{ toString: Object.prototype.toString }", { toString: Object.prototype.toString });

			console.log("user toString (may crash):");
			const userToString = { toString: function() { return "custom"; } };
			console.log(" direct call works: " + userToString.toString());
			test("{ toString: fn => 'custom' }", userToString);

			console.log("arrow toString (may crash):");
			const arrowToString = { toString: () => "arrow" };
			console.log(" direct call works: " + arrowToString.toString());
			test("{ toString: () => 'arrow' }", arrowToString);

			// Custom valueOf
			console.log("--- CUSTOM valueOf ---\n");
			test("{ valueOf: fn => 42 }", { valueOf: function() { return 42; } });
			test("{ valueOf: fn => 'val' }", { valueOf: function() { return "val"; } });

			// Symbol.toPrimitive
			console.log("--- Symbol.toPrimitive ---\n");
			const withPrimitive = {};
			withPrimitive[Symbol.toPrimitive] = function(hint) { return "hint:" + hint; };
			test("{ [Symbol.toPrimitive]: fn }", withPrimitive);

			// Class instances
			console.log("--- CLASS INSTANCES ---\n");

			class WithToString {
			toString() { return "class-toString"; }
			}
			console.log("class with toString method:");
			const inst1 = new WithToString();
			console.log(" direct call works: " + inst1.toString());
			test("new WithToString()", inst1);

			class WithValueOf {
			valueOf() { return "class-valueOf"; }
			}
			test("new WithValueOf()", new WithValueOf());

			class PlainClass {}
			test("new PlainClass()", new PlainClass());

			console.log("=== SUMMARY ===\n");
			console.log("Check for:");
			console.log("1. Missing output after test name = SILENT CRASH");
			console.log("2. '[Function: ...]' instead of function source = INSPECT BUG");
			console.log("3. '{ ... }' or '[ ... ]' with spaces = INSPECT BUG");
			console.log("4. Different results between concat and template = BUG");
			console.log("");

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