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/**
* Minimal in-browser test runner (no npm / no Node).
* Provides describe/it/assert and renders results into the document.
*/
(() => {
'use strict';
const suites = [];
let currentSuite = null;
const results = [];
/**
* @param {string} name
* @param {() => void} fn
*/
function describe(name, fn) {
currentSuite = { name, tests: [] };
suites.push(currentSuite);
fn();
currentSuite = null;
}
/**
* @param {string} name
* @param {() => void|Promise<void>} fn
*/
function it(name, fn) {
if (!currentSuite) throw new Error('it() outside describe()');
currentSuite.tests.push({ name, fn });
}
class AssertionError extends Error {}
/**
* @param {*} actual
* @param {*} expected
* @param {string} [message]
*/
function assertEqual(actual, expected, message) {
const a = JSON.stringify(actual);
const b = JSON.stringify(expected);
if (a !== b) {
throw new AssertionError(message || `expected ${b}, got ${a}`);
}
}
/**
* @param {*} actual
* @param {string} [message]
*/
function assertTrue(actual, message) {
if (actual !== true) {
throw new AssertionError(message || `expected true, got ${JSON.stringify(actual)}`);
}
}
/**
* @param {*} actual
* @param {string} [message]
*/
function assertFalse(actual, message) {
if (actual !== false) {
throw new AssertionError(message || `expected false, got ${JSON.stringify(actual)}`);
}
}
/**
* @param {number} actual
* @param {number} expected
* @param {number} epsilon
* @param {string} [message]
*/
function assertCloseTo(actual, expected, epsilon, message) {
if (Math.abs(actual - expected) > epsilon) {
throw new AssertionError(message || `expected ~${expected}, got ${actual}`);
}
}
/**
* @param {Function} fn
* @param {string} [message]
*/
async function assertThrowsAsync(fn, message) {
try {
await fn();
} catch {
return;
}
throw new AssertionError(message || 'expected function to throw');
}
async function run() {
const root = document.getElementById('results');
const summary = document.getElementById('summary');
let passed = 0;
let failed = 0;
for (const suite of suites) {
const suiteEl = document.createElement('section');
const heading = document.createElement('h2');
heading.textContent = suite.name;
suiteEl.append(heading);
for (const test of suite.tests) {
const row = document.createElement('div');
row.className = 'test';
try {
await test.fn();
passed++;
row.classList.add('pass');
row.textContent = `✔ ${test.name}`;
} catch (error) {
failed++;
row.classList.add('fail');
row.textContent = `✘ ${test.name} — ${error && error.message ? error.message : String(error)}`;
}
suiteEl.append(row);
}
root.append(suiteEl);
}
summary.textContent = `${passed} passed, ${failed} failed`;
summary.className = failed === 0 ? 'all-pass' : 'has-failures';
document.title = failed === 0 ? 'PASS - Tests' : 'FAIL - Tests';
}
window.TestRunner = { describe, it, assertEqual, assertTrue, assertFalse, assertCloseTo, assertThrowsAsync, run };
})();
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