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https://github.com/RGBCube/serenity
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LibJS/test-js: Create test-js program, prepare for test suite refactor
This moves most of the work from run-tests.sh to test-js.cpp. This way, we have a lot more control over how the test suite runs, as well as how it outputs. This should result in some cool functionality! This commit also refactors test-common.js to mimic the jest library. This should allow tests to be much more expressive :)
This commit is contained in:
Matthew Olsson
Andreas Kling
parent
c43afe71b7
commit
b9cf7a833f
4 changed files with 717 additions and 102 deletions
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@ -1,116 +1,34 @@
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/**
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* Custom error for failed assertions.
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* @constructor
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* @param {string} message Error message
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* @returns Error
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*/
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function AssertionError(message) {
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var instance = new Error(message);
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instance.name = 'AssertionError';
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Object.setPrototypeOf(instance, Object.getPrototypeOf(this));
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return instance;
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}
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let describe;
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let test;
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let expect;
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/**
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* Throws an `AssertionError` if `value` is not truthy.
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* @param {*} value Value to be tested
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*/
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function assert(value) {
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if (!value)
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throw new AssertionError("The assertion failed!");
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}
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// Stores the results of each test and suite. Has a terrible
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// name to avoid name collision.
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let __TestResults__ = {};
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/**
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* Throws an `AssertionError` when called.
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* @throws {AssertionError}
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*/
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function assertNotReached() {
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throw new AssertionError("assertNotReached() was reached!");
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}
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// This array is used to communicate with the C++ program. It treats
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// each message in this array as a separate message. Has a terrible
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// name to avoid name collision.
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let __UserOutput__ = [];
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/**
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* Ensures the provided functions throws a specific error.
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* @param {Function} testFunction Function executing the throwing code
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* @param {object} [options]
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* @param {Error} [options.error] Expected error type
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* @param {string} [options.name] Expected error name
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* @param {string} [options.message] Expected error message
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*/
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function assertThrowsError(testFunction, options) {
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try {
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testFunction();
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assertNotReached();
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} catch (e) {
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if (options.error !== undefined)
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assert(e instanceof options.error);
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if (options.name !== undefined)
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assert(e.name === options.name);
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if (options.message !== undefined)
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assert(e.message === options.message);
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}
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}
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/**
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* Ensures the provided JavaScript source code results in a SyntaxError
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* @param {string} source The JavaScript source code to compile
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*/
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function assertIsSyntaxError(source) {
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assertThrowsError(() => {
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new Function(source)();
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}, {
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error: SyntaxError,
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});
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}
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/**
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* Ensures the provided arrays contain exactly the same items.
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* @param {Array} a First array
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* @param {Array} b Second array
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*/
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function assertArrayEquals(a, b) {
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if (a.length != b.length)
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throw new AssertionError("Array lengths do not match");
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for (var i = 0; i < a.length; i++) {
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if (a[i] !== b[i])
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throw new AssertionError("Elements do not match");
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}
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}
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const assertVisitsAll = (testFunction, expectedOutput) => {
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const visited = [];
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testFunction(value => visited.push(value));
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assert(visited.length === expectedOutput.length);
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expectedOutput.forEach((value, i) => assert(visited[i] === value));
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// We also rebind console.log here to use the array above
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console.log = (...args) => {
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__UserOutput__.push(args.join(" "));
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};
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/**
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* Check whether the difference between two numbers is less than 0.000001.
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* @param {Number} a First number
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* @param {Number} b Second number
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*/
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function isClose(a, b) {
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return Math.abs(a - b) < 0.000001;
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}
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// Use an IIFE to avoid polluting the global namespace as much as possible
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(() => {
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/**
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* Quick and dirty deep equals method.
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* @param {*} a First value
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* @param {*} b Second value
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*/
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function assertDeepEquals(a, b) {
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assert(deepEquals(a, b));
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}
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function deepEquals(a, b) {
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// FIXME: This is a very naive deepEquals algorithm
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const deepEquals = (a, b) => {
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if (Array.isArray(a))
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return Array.isArray(b) && deepArrayEquals(a, b);
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if (typeof a === "object")
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return typeof b === "object" && deepObjectEquals(a, b);
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return a === b;
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return Object.is(a, b);
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}
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function deepArrayEquals(a, b) {
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const deepArrayEquals = (a, b) => {
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if (a.length !== b.length)
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return false;
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for (let i = 0; i < a.length; ++i) {
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@ -120,7 +38,7 @@ function deepArrayEquals(a, b) {
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return true;
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}
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function deepObjectEquals(a, b) {
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const deepObjectEquals = (a, b) => {
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if (a === null)
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return b === null;
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for (let key of Reflect.ownKeys(a)) {
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@ -129,3 +47,321 @@ function deepObjectEquals(a, b) {
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}
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return true;
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}
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class ExpectationError extends Error {
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constructor(message, fileName, lineNumber) {
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super(message, fileName, lineNumber);
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this.name = "ExpectationError";
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}
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}
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class Expector {
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constructor(target, inverted) {
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this.target = target;
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this.inverted = !!inverted;
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}
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get not() {
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return new Expector(this.target, !this.inverted);
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}
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toBe(value) {
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this.__doMatcher(() => {
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this.__expect(Object.is(this.target, value));
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});
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}
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toHaveLength(length) {
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this.__doMatcher(() => {
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this.__expect(Object.is(this.target.length, length));
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});
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}
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toHaveProperty(property, value) {
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this.__doMatcher(() => {
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let object = this.target;
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if (typeof property === "string" && property.includes(".")) {
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let propertyArray = [];
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while (true) {
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let index = property.indexOf(".");
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if (index === -1) {
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propertyArray.push(property);
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break;
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}
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propertyArray.push(property.substring(0, index));
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property = property.substring(index, property.length);
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}
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property = propertyArray;
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}
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if (Array.isArray(property)) {
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for (let key of property) {
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if (object === undefined || object === null) {
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if (this.inverted)
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return;
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throw new ExpectationError();
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}
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object = object[key];
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}
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} else {
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object = object[property];
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}
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this.__expect(object !== undefined);
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if (value !== undefined)
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this.__expect(deepEquals(object, value));
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});
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}
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toBeCloseTo(number, numDigits) {
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if (numDigits === undefined)
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numDigits = 2;
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this.__doMatcher(() => {
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this.__expect(Math.abs(number - this.target) < (10 ** -numDigits / numDigits));
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});
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}
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toBeDefined() {
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this.__doMatcher(() => {
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this.__expect(this.target !== undefined);
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});
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}
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toBeFalsey() {
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this.__doMatcher(() => {
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this.__expect(!this.target);
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});
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}
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toBeGreaterThan(number) {
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this.__doMatcher(() => {
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this.__expect(this.target > number);
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});
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}
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toBeGreaterThanOrEqual(number) {
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this.__doMatcher(() => {
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this.__expect(this.target >= number);
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});
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}
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toBeLessThan(number) {
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this.__doMatcher(() => {
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this.__expect(this.target < number);
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});
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}
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toBeLessThanOrEqual(number) {
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this.__doMatcher(() => {
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this.__expect(this.target <= number);
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});
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}
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toBeInstanceOf(class_) {
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this.__doMatcher(() => {
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this.__expect(this.target instanceof class_);
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});
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}
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toBeNull() {
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this.__doMatcher(() => {
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this.__expect(this.target === null);
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});
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}
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toBeTruthy() {
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this.__doMatcher(() => {
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this.__expect(!!this.target);
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});
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}
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toBeUndefined() {
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this.__doMatcher(() => {
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this.__expect(this.target === undefined);
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});
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}
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toBeNaN() {
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this.__doMatcher(() => {
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this.__expect(isNaN(this.target));
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});
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}
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toContain(item) {
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this.__doMatcher(() => {
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// FIXME: Iterator check
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for (let element of this.target) {
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if (item === element)
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return;
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}
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throw new ExpectationError();
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});
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}
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toContainEqual(item) {
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this.__doMatcher(() => {
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// FIXME: Iterator check
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for (let element of this.target) {
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if (deepEquals(item, element))
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return;
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}
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throw new ExpectationError();
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});
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}
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toEqual(value) {
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this.__doMatcher(() => {
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this.__expect(deepEquals(this.target, value));
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});
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}
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toThrow(value) {
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this.__expect(typeof this.target === "function");
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this.__expect(typeof value === "string" || typeof value === "function" || value === undefined);
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this.__doMatcher(() => {
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try {
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this.target();
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this.__expect(false);
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} catch (e) {
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if (typeof value === "string") {
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this.__expect(e.message.includes(value));
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} else if (typeof value === "function") {
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this.__expect(e instanceof value);
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}
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}
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});
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}
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pass(message) {
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// FIXME: This does nothing. If we want to implement things
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// like assertion count, this will have to do something
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}
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// jest-extended
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fail(message) {
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// FIXME: message is currently ignored
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this.__doMatcher(() => {
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this.__expect(false);
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})
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}
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// jest-extended
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toThrowWithMessage(class_, message) {
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this.__expect(typeof this.target === "function");
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this.__expect(class_ !== undefined);
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this.__expect(message !== undefined);
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this.__doMatcher(() => {
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try {
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this.target();
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this.__expect(false);
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} catch (e) {
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this.__expect(e instanceof class_);
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this.__expect(e.message.includes(message));
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}
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});
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}
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// Test for syntax errors; target must be a string
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toEval() {
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this.__expect(typeof this.target === "string");
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if (!this.inverted) {
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try {
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new Function(this.target)();
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} catch (e) {
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throw new ExpectationError();
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}
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} else {
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try {
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new Function(this.target)();
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throw new ExpectationError();
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} catch (e) {
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if (e.name !== "SyntaxError")
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throw new ExpectationError();
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}
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}
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}
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// Must compile regardless of inverted-ness
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toEvalTo(value) {
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this.__expect(typeof this.target === "string");
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let result;
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try {
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result = new Function(this.target)();
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} catch (e) {
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throw new ExpectationError();
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}
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this.__doMatcher(() => {
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this.__expect(deepEquals(value, result));
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});
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}
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__doMatcher(matcher) {
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if (!this.inverted) {
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matcher();
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} else {
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let threw = false;
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try {
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matcher();
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} catch (e) {
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if (e.name === "ExpectationError")
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threw = true;
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}
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if (!threw)
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throw new ExpectationError();
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}
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}
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__expect(value) {
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if (value !== true)
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throw new ExpectationError();
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}
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}
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expect = value => new Expector(value);
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// describe is able to lump test results inside of it by using this context
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// variable. Top level tests are assumed to be in the default context
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const defaultSuiteMessage = "__$$TOP_LEVEL$$__";
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let suiteMessage = defaultSuiteMessage;
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describe = (message, callback) => {
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suiteMessage = message;
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callback();
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suiteMessage = defaultSuiteMessage;
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}
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test = (message, callback) => {
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if (!__TestResults__[suiteMessage])
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__TestResults__[suiteMessage] = {};
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const suite = __TestResults__[suiteMessage];
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if (!suite[message])
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suite[message] = {};
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try {
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callback();
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suite[message] = {
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passed: true,
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};
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} catch (e) {
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suite[message] = {
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passed: false,
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};
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}
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}
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})();
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