mirror of
https://github.com/swc-project/swc.git
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385 lines
9.5 KiB
TypeScript
385 lines
9.5 KiB
TypeScript
// Loaded from https://raw.githubusercontent.com/denjucks/dex/master/lib/deps/testing/asserts.ts
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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import { red, green, white, gray, bold } from "../fmt/colors.ts";
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import diff, { DiffType, DiffResult } from "./diff.ts";
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const CAN_NOT_DISPLAY = "[Cannot display]";
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interface Constructor {
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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new (...args: any[]): any;
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}
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export class AssertionError extends Error {
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constructor(message: string) {
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super(message);
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this.name = "AssertionError";
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}
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}
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function format(v: unknown): string {
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let string = Deno.inspect(v);
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if (typeof v == "string") {
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string = `"${string.replace(/(?=["\\])/g, "\\")}"`;
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}
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return string;
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}
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function createColor(diffType: DiffType): (s: string) => string {
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switch (diffType) {
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case DiffType.added:
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return (s: string): string => green(bold(s));
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case DiffType.removed:
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return (s: string): string => red(bold(s));
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default:
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return white;
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}
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}
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function createSign(diffType: DiffType): string {
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switch (diffType) {
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case DiffType.added:
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return "+ ";
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case DiffType.removed:
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return "- ";
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default:
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return " ";
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}
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}
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function buildMessage(diffResult: ReadonlyArray<DiffResult<string>>): string[] {
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const messages: string[] = [];
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messages.push("");
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messages.push("");
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messages.push(
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` ${gray(bold("[Diff]"))} ${red(bold("Actual"))} / ${green(
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bold("Expected")
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)}`
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);
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messages.push("");
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messages.push("");
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diffResult.forEach((result: DiffResult<string>): void => {
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const c = createColor(result.type);
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messages.push(c(`${createSign(result.type)}${result.value}`));
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});
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messages.push("");
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return messages;
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}
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function isKeyedCollection(x: unknown): x is Set<unknown> {
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return [Symbol.iterator, "size"].every((k) => k in (x as Set<unknown>));
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}
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export function equal(c: unknown, d: unknown): boolean {
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const seen = new Map();
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return (function compare(a: unknown, b: unknown): boolean {
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// Have to render RegExp & Date for string comparison
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// unless it's mistreated as object
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if (
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a &&
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b &&
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((a instanceof RegExp && b instanceof RegExp) ||
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(a instanceof Date && b instanceof Date))
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) {
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return String(a) === String(b);
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}
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if (Object.is(a, b)) {
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return true;
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}
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if (a && typeof a === "object" && b && typeof b === "object") {
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if (seen.get(a) === b) {
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return true;
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}
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if (Object.keys(a || {}).length !== Object.keys(b || {}).length) {
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return false;
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}
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if (isKeyedCollection(a) && isKeyedCollection(b)) {
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if (a.size !== b.size) {
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return false;
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}
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let unmatchedEntries = a.size;
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for (const [aKey, aValue] of a.entries()) {
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for (const [bKey, bValue] of b.entries()) {
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/* Given that Map keys can be references, we need
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* to ensure that they are also deeply equal */
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if (
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(aKey === aValue && bKey === bValue && compare(aKey, bKey)) ||
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(compare(aKey, bKey) && compare(aValue, bValue))
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) {
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unmatchedEntries--;
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}
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}
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}
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return unmatchedEntries === 0;
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}
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const merged = { ...a, ...b };
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for (const key in merged) {
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type Key = keyof typeof merged;
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if (!compare(a && a[key as Key], b && b[key as Key])) {
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return false;
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}
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}
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seen.set(a, b);
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return true;
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}
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return false;
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})(c, d);
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}
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/** Make an assertion, if not `true`, then throw. */
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export function assert(expr: unknown, msg = ""): asserts expr {
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if (!expr) {
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throw new AssertionError(msg);
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}
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}
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/**
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* Make an assertion that `actual` and `expected` are equal, deeply. If not
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* deeply equal, then throw.
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*/
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export function assertEquals(
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actual: unknown,
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expected: unknown,
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msg?: string
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): void {
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if (equal(actual, expected)) {
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return;
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}
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let message = "";
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const actualString = format(actual);
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const expectedString = format(expected);
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try {
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const diffResult = diff(
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actualString.split("\n"),
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expectedString.split("\n")
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);
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message = buildMessage(diffResult).join("\n");
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} catch (e) {
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message = `\n${red(CAN_NOT_DISPLAY)} + \n\n`;
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}
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if (msg) {
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message = msg;
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}
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throw new AssertionError(message);
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}
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/**
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* Make an assertion that `actual` and `expected` are not equal, deeply.
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* If not then throw.
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*/
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export function assertNotEquals(
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actual: unknown,
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expected: unknown,
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msg?: string
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): void {
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if (!equal(actual, expected)) {
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return;
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}
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let actualString: string;
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let expectedString: string;
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try {
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actualString = String(actual);
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} catch (e) {
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actualString = "[Cannot display]";
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}
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try {
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expectedString = String(expected);
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} catch (e) {
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expectedString = "[Cannot display]";
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}
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if (!msg) {
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msg = `actual: ${actualString} expected: ${expectedString}`;
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}
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throw new AssertionError(msg);
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}
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/**
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* Make an assertion that `actual` and `expected` are strictly equal. If
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* not then throw.
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*/
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export function assertStrictEq(
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actual: unknown,
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expected: unknown,
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msg?: string
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): void {
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if (actual !== expected) {
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let actualString: string;
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let expectedString: string;
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try {
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actualString = String(actual);
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} catch (e) {
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actualString = "[Cannot display]";
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}
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try {
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expectedString = String(expected);
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} catch (e) {
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expectedString = "[Cannot display]";
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}
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if (!msg) {
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msg = `actual: ${actualString} expected: ${expectedString}`;
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}
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throw new AssertionError(msg);
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}
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}
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/**
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* Make an assertion that actual contains expected. If not
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* then thrown.
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*/
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export function assertStrContains(
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actual: string,
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expected: string,
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msg?: string
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): void {
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if (!actual.includes(expected)) {
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if (!msg) {
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msg = `actual: "${actual}" expected to contains: "${expected}"`;
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}
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throw new AssertionError(msg);
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}
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}
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/**
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* Make an assertion that `actual` contains the `expected` values
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* If not then thrown.
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*/
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export function assertArrayContains(
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actual: unknown[],
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expected: unknown[],
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msg?: string
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): void {
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const missing: unknown[] = [];
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for (let i = 0; i < expected.length; i++) {
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let found = false;
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for (let j = 0; j < actual.length; j++) {
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if (equal(expected[i], actual[j])) {
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found = true;
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break;
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}
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}
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if (!found) {
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missing.push(expected[i]);
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}
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}
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if (missing.length === 0) {
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return;
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}
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if (!msg) {
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msg = `actual: "${actual}" expected to contains: "${expected}"`;
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msg += "\n";
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msg += `missing: ${missing}`;
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}
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throw new AssertionError(msg);
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}
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/**
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* Make an assertion that `actual` match RegExp `expected`. If not
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* then thrown
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*/
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export function assertMatch(
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actual: string,
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expected: RegExp,
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msg?: string
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): void {
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if (!expected.test(actual)) {
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if (!msg) {
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msg = `actual: "${actual}" expected to match: "${expected}"`;
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}
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throw new AssertionError(msg);
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}
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}
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/**
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* Forcefully throws a failed assertion
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*/
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export function fail(msg?: string): void {
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// eslint-disable-next-line @typescript-eslint/no-use-before-define
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assert(false, `Failed assertion${msg ? `: ${msg}` : "."}`);
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}
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/** Executes a function, expecting it to throw. If it does not, then it
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* throws. An error class and a string that should be included in the
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* error message can also be asserted.
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*/
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export function assertThrows(
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fn: () => void,
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ErrorClass?: Constructor,
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msgIncludes = "",
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msg?: string
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): Error {
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let doesThrow = false;
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let error = null;
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try {
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fn();
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} catch (e) {
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if (ErrorClass && !(Object.getPrototypeOf(e) === ErrorClass.prototype)) {
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msg = `Expected error to be instance of "${ErrorClass.name}", but was "${
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e.constructor.name
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}"${msg ? `: ${msg}` : "."}`;
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throw new AssertionError(msg);
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}
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if (msgIncludes && !e.message.includes(msgIncludes)) {
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msg = `Expected error message to include "${msgIncludes}", but got "${
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e.message
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}"${msg ? `: ${msg}` : "."}`;
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throw new AssertionError(msg);
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}
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doesThrow = true;
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error = e;
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}
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if (!doesThrow) {
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msg = `Expected function to throw${msg ? `: ${msg}` : "."}`;
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throw new AssertionError(msg);
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}
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return error;
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}
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export async function assertThrowsAsync(
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fn: () => Promise<void>,
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ErrorClass?: Constructor,
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msgIncludes = "",
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msg?: string
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): Promise<Error> {
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let doesThrow = false;
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let error = null;
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try {
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await fn();
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} catch (e) {
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if (ErrorClass && !(Object.getPrototypeOf(e) === ErrorClass.prototype)) {
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msg = `Expected error to be instance of "${ErrorClass.name}", but got "${
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e.name
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}"${msg ? `: ${msg}` : "."}`;
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throw new AssertionError(msg);
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}
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if (msgIncludes && !e.message.includes(msgIncludes)) {
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msg = `Expected error message to include "${msgIncludes}", but got "${
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e.message
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}"${msg ? `: ${msg}` : "."}`;
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throw new AssertionError(msg);
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}
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doesThrow = true;
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error = e;
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}
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if (!doesThrow) {
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msg = `Expected function to throw${msg ? `: ${msg}` : "."}`;
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throw new AssertionError(msg);
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}
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return error;
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}
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/** Use this to stub out methods that will throw when invoked. */
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export function unimplemented(msg?: string): never {
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throw new AssertionError(msg || "unimplemented");
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}
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/** Use this to assert unreachable code. */
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export function unreachable(): never {
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throw new AssertionError("unreachable");
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}
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