helpers.js
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helpers.js
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	const GREEN = '\x1b[32m';
	const RED = '\x1b[31m';
	const RESET = '\x1b[0m';

	let passed = 0;
	let failed = 0;

	export function test(name, actual, expected) {
	if (actual === expected) {
	console.log(`${GREEN}✓${RESET} ${name}`);
	passed++;
	} else {
	console.log(`${RED}✗${RESET} ${name}`);
	console.log(` Expected: ${expected}`);
	console.log(` Actual: ${actual}`);
	failed++;
	}
	}

	export function testApprox(name, actual, expected, epsilon = 1e-10) {
	const pass = (Number.isNaN(actual) && Number.isNaN(expected)) \|\|
	(!Number.isFinite(actual) && !Number.isFinite(expected) && actual === expected) \|\|
	Math.abs(actual - expected) < epsilon;
	if (pass) {
	console.log(`${GREEN}✓${RESET} ${name}`);
	passed++;
	} else {
	console.log(`${RED}✗${RESET} ${name}`);
	console.log(` Expected: ${expected}`);
	console.log(` Actual: ${actual}`);
	failed++;
	}
	}

	export function testThrows(name, fn) {
	try {
	fn();
	console.log(`${RED}✗${RESET} ${name} (expected to throw)`);
	failed++;
	} catch (e) {
	console.log(`${GREEN}✓${RESET} ${name}`);
	passed++;
	}
	}

	export function testDeep(name, actual, expected) {
	const pass = JSON.stringify(actual) === JSON.stringify(expected);
	if (pass) {
	console.log(`${GREEN}✓${RESET} ${name}`);
	passed++;
	} else {
	console.log(`${RED}✗${RESET} ${name}`);
	console.log(` Expected: ${JSON.stringify(expected)}`);
	console.log(` Actual: ${JSON.stringify(actual)}`);
	failed++;
	}
	}

	export function summary() {
	console.log(`\nPassed: ${passed}`);
	console.log(`Failed: ${failed}`);
	if (failed > 0) process.exit(1);
	}

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