450dedabd1
This makes it a lot easier to understand what is going wrong when an eval test fails. As an example instead of just getting: `ExpectationError` You would now get: `ExpectationError: Expected _1_2E+0_1_ to eval to _12_ but got _120_`.
539 lines
17 KiB
JavaScript
539 lines
17 KiB
JavaScript
var describe;
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var test;
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var expect;
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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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var __TestResults__ = {};
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// So test names like "toString" don't automatically produce an error
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Object.setPrototypeOf(__TestResults__, null);
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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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var __UserOutput__ = [];
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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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class ExpectationError extends Error {
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constructor(message) {
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super(message);
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this.name = "ExpectationError";
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}
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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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// FIXME: This is a very naive deepEquals algorithm
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const deepEquals = (a, b) => {
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if (Array.isArray(a)) return Array.isArray(b) && deepArrayEquals(a, b);
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if (typeof a === "object") return typeof b === "object" && deepObjectEquals(a, b);
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return Object.is(a, b);
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};
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const deepArrayEquals = (a, b) => {
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if (a.length !== b.length) return false;
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for (let i = 0; i < a.length; ++i) {
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if (!deepEquals(a[i], b[i])) return false;
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}
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return true;
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};
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const deepObjectEquals = (a, b) => {
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if (a === null) return b === null;
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for (let key of Reflect.ownKeys(a)) {
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if (!deepEquals(a[key], b[key])) return false;
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}
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return true;
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};
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const valueToString = value => {
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try {
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return String(value);
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} catch {
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// e.g for objects without a prototype, the above throws.
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return Object.prototype.toString.call(value);
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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(
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Object.is(this.target, value),
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() =>
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`toBe: expected _${valueToString(value)}_, got _${valueToString(
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this.target
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)}_`
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);
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});
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}
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// FIXME: Take a precision argument like jest's toBeCloseTo matcher
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toBeCloseTo(value) {
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this.__expect(
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typeof this.target === "number",
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() => `toBeCloseTo: expected target of type number, got ${typeof value}`
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);
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this.__expect(
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typeof value === "number",
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() => `toBeCloseTo: expected argument of type number, got ${typeof value}`
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);
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this.__doMatcher(() => {
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this.__expect(Math.abs(this.target - value) < 0.000001);
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});
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}
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toHaveLength(length) {
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this.__expect(
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typeof this.target.length === "number",
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() => "toHaveLength: target.length not of type number"
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);
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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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toHaveSize(size) {
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this.__expect(
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typeof this.target.size === "number",
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() => "toHaveSize: target.size not of type number"
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);
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this.__doMatcher(() => {
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this.__expect(Object.is(this.target.size, size));
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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 (property.includes(".")) {
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let index = property.indexOf(".");
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propertyArray.push(property.substring(0, index));
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if (index + 1 >= property.length) break;
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property = property.substring(index + 1, property.length);
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}
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propertyArray.push(property);
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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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this.__expect(object !== undefined && object !== null);
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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) this.__expect(deepEquals(object, value));
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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(
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this.target !== undefined,
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() => "toBeDefined: expected target to be defined, got undefined"
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);
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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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toBeUndefined() {
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this.__doMatcher(() => {
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this.__expect(
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this.target === undefined,
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() =>
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`toBeUndefined: expected target to be undefined, got _${valueToString(
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this.target
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)}_`
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);
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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(
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isNaN(this.target),
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() => `toBeNaN: expected target to be NaN, got _${valueToString(this.target)}_`
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);
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});
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}
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toBeTrue() {
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this.__doMatcher(() => {
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this.__expect(
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this.target === true,
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() =>
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`toBeTrue: expected target to be true, got _${valueToString(this.target)}_`
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);
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});
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}
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toBeFalse() {
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this.__doMatcher(() => {
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this.__expect(
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this.target === false,
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() =>
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`toBeFalse: expected target to be false, got _${valueToString(
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this.target
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)}_`
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);
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});
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}
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__validateNumericComparisonTypes(value) {
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this.__expect(typeof this.target === "number" || typeof this.target === "bigint");
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this.__expect(typeof value === "number" || typeof value === "bigint");
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this.__expect(typeof this.target === typeof value);
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}
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toBeLessThan(value) {
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this.__validateNumericComparisonTypes(value);
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this.__doMatcher(() => {
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this.__expect(this.target < value);
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});
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}
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toBeLessThanOrEqual(value) {
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this.__validateNumericComparisonTypes(value);
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this.__doMatcher(() => {
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this.__expect(this.target <= value);
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});
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}
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toBeGreaterThan(value) {
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this.__validateNumericComparisonTypes(value);
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this.__doMatcher(() => {
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this.__expect(this.target > value);
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});
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}
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toBeGreaterThanOrEqual(value) {
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this.__validateNumericComparisonTypes(value);
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this.__doMatcher(() => {
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this.__expect(this.target >= value);
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});
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}
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toContain(item) {
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this.__doMatcher(() => {
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for (let element of this.target) {
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if (item === element) 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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for (let element of this.target) {
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if (deepEquals(item, element)) 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(
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typeof value === "string" ||
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typeof value === "function" ||
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typeof value === "object" ||
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value === undefined
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);
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this.__doMatcher(() => {
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let threw = true;
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try {
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this.target();
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threw = 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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} else if (typeof value === "object") {
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this.__expect(e.message === value.message);
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}
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}
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this.__expect(threw);
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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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this.__doMatcher(() => {
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this.__expect(false, message);
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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, () => "toThrowWithMessage: target function did not throw");
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} catch (e) {
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this.__expect(
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e instanceof class_,
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() =>
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`toThrowWithMessage: expected error to be instance of ${valueToString(
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class_.name
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)}, got ${valueToString(e.name)}`
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);
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this.__expect(
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e.message.includes(message),
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() =>
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`toThrowWithMessage: expected error message to include _${valueToString(
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message
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)}_, got _${valueToString(e.message)}_`
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);
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}
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});
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}
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// Test for syntax errors; target must be a string
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toEval() {
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this.__expect(typeof this.target === "string");
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const success = canParseSource(this.target);
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this.__expect(
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this.inverted ? !success : success,
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() =>
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`Expected _${valueToString(this.target)}_` +
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(this.inverted ? "not to eval but it did" : "to eval but it didn't")
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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 = eval(this.target);
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} catch (e) {
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throw new ExpectationError(
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`Expected _${valueToString(this.target)}_ to eval but it failed with ${e}`
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);
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}
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this.__doMatcher(() => {
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this.__expect(
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deepEquals(value, result),
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() =>
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`Expected _${valueToString(this.target)}_ to eval to ` +
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`_${valueToString(value)}_ but got _${valueToString(result)}_`
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);
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});
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}
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toHaveConfigurableProperty(property) {
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this.__expect(this.target !== undefined && this.target !== null);
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let d = Object.getOwnPropertyDescriptor(this.target, property);
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this.__expect(d !== undefined);
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this.__doMatcher(() => {
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this.__expect(d.configurable);
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});
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}
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toHaveEnumerableProperty(property) {
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this.__expect(this.target !== undefined && this.target !== null);
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let d = Object.getOwnPropertyDescriptor(this.target, property);
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this.__expect(d !== undefined);
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this.__doMatcher(() => {
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this.__expect(d.enumerable);
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});
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}
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toHaveWritableProperty(property) {
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this.__expect(this.target !== undefined && this.target !== null);
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let d = Object.getOwnPropertyDescriptor(this.target, property);
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this.__expect(d !== undefined);
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this.__doMatcher(() => {
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this.__expect(d.writable);
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});
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}
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toHaveValueProperty(property, value) {
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this.__expect(this.target !== undefined && this.target !== null);
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let d = Object.getOwnPropertyDescriptor(this.target, property);
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this.__expect(d !== undefined);
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this.__doMatcher(() => {
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this.__expect(d.value !== undefined);
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if (value !== undefined) this.__expect(deepEquals(value, d.value));
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});
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}
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toHaveGetterProperty(property) {
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this.__expect(this.target !== undefined && this.target !== null);
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let d = Object.getOwnPropertyDescriptor(this.target, property);
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this.__expect(d !== undefined);
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this.__doMatcher(() => {
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this.__expect(d.get !== undefined);
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});
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}
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toHaveSetterProperty(property) {
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this.__expect(this.target !== undefined && this.target !== null);
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let d = Object.getOwnPropertyDescriptor(this.target, property);
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this.__expect(d !== undefined);
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this.__doMatcher(() => {
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this.__expect(d.set !== undefined);
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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") threw = true;
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}
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if (!threw) throw new ExpectationError("not: test didn't fail");
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}
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}
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__expect(value, details) {
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if (value !== true) {
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if (details !== undefined) {
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throw new ExpectationError(details());
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} else {
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throw new ExpectationError();
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}
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}
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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 have the default suite message
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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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if (!__TestResults__[suiteMessage]) __TestResults__[suiteMessage] = {};
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try {
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callback();
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} catch (e) {
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__TestResults__[suiteMessage][defaultSuiteMessage] = {
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result: "fail",
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details: String(e),
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};
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}
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suiteMessage = defaultSuiteMessage;
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};
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test = (message, callback) => {
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if (!__TestResults__[suiteMessage]) __TestResults__[suiteMessage] = {};
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const suite = __TestResults__[suiteMessage];
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if (Object.prototype.hasOwnProperty.call(suite, message)) {
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suite[message] = {
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result: "fail",
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details: "Another test with the same message did already run",
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};
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return;
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}
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try {
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callback();
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suite[message] = {
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result: "pass",
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};
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} catch (e) {
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suite[message] = {
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result: "fail",
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details: String(e),
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};
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}
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};
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test.skip = (message, callback) => {
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if (typeof callback !== "function")
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throw new Error("test.skip has invalid second argument (must be a function)");
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if (!__TestResults__[suiteMessage]) __TestResults__[suiteMessage] = {};
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const suite = __TestResults__[suiteMessage];
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if (Object.prototype.hasOwnProperty.call(suite, message)) {
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suite[message] = {
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result: "fail",
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details: "Another test with the same message did already run",
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};
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return;
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}
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suite[message] = {
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result: "skip",
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};
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};
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})();
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