mirror of
https://github.com/denoland/deno.git
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617 lines
15 KiB
TypeScript
617 lines
15 KiB
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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/** This module is browser compatible. Do not rely on good formatting of values
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* for AssertionError messages in browsers. */
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import { bold, gray, green, red, stripColor, white } from "../fmt/colors.ts";
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import { diff, DiffResult, DiffType } from "./_diff.ts";
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const CAN_NOT_DISPLAY = "[Cannot display]";
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interface Constructor {
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// deno-lint-ignore 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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/**
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* Converts the input into a string. Objects, Sets and Maps are sorted so as to
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* make tests less flaky
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* @param v Value to be formatted
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*/
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export function _format(v: unknown): string {
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return globalThis.Deno
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? Deno.inspect(v, {
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depth: Infinity,
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sorted: true,
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trailingComma: true,
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compact: false,
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iterableLimit: Infinity,
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})
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: `"${String(v).replace(/(?=["\\])/g, "\\")}"`;
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}
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/**
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* Colors the output of assertion diffs
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* @param diffType Difference type, either added or removed
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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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/**
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* Prefixes `+` or `-` in diff output
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* @param diffType Difference type, either added or removed
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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"))} / ${
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green(bold("Expected"))
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}`,
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);
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messages.push("");
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messages.push("");
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diffResult.forEach((result: DiffResult<string>): void => {
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const c = createColor(result.type);
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messages.push(c(`${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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/**
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* Deep equality comparison used in assertions
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* @param c actual value
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* @param d expected value
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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 URL && b instanceof URL))
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) {
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return String(a) === String(b);
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}
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if (a instanceof Date && b instanceof Date) {
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const aTime = a.getTime();
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const bTime = b.getTime();
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// Check for NaN equality manually since NaN is not
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// equal to itself.
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if (Number.isNaN(aTime) && Number.isNaN(bTime)) {
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return true;
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}
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return a.getTime() === b.getTime();
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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, error will be thrown if `expr` does not have truthy value. */
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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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* Type parameter can be specified to ensure values under comparison have the same type.
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* For example:
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*```ts
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*assertEquals<number>(1, 2)
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*```
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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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export function assertEquals<T>(actual: T, expected: T, msg?: string): void;
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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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const diffMsg = buildMessage(diffResult).join("\n");
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message = `Values are not equal:\n${diffMsg}`;
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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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* Type parameter can be specified to ensure values under comparison have the same type.
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* For example:
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*```ts
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*assertNotEquals<number>(1, 2)
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*```
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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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export function assertNotEquals<T>(actual: T, expected: T, msg?: string): void;
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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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* ```ts
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* assertStrictEquals(1, 2)
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* ```
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*/
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export function assertStrictEquals(
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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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export function assertStrictEquals<T>(
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actual: T,
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expected: T,
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msg?: string,
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): void;
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export function assertStrictEquals(
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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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return;
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}
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let message: string;
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if (msg) {
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message = msg;
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} else {
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const actualString = _format(actual);
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const expectedString = _format(expected);
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if (actualString === expectedString) {
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const withOffset = actualString
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.split("\n")
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.map((l) => ` ${l}`)
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.join("\n");
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message =
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`Values have the same structure but are not reference-equal:\n\n${
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red(withOffset)
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}\n`;
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} else {
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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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const diffMsg = buildMessage(diffResult).join("\n");
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message = `Values are not strictly equal:\n${diffMsg}`;
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} catch (e) {
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message = `\n${red(CAN_NOT_DISPLAY)} + \n\n`;
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}
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}
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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 strictly equal.
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* If the values are strictly equal then throw.
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* ```ts
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* assertNotStrictEquals(1, 1)
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* ```
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*/
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export function assertNotStrictEquals(
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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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export function assertNotStrictEquals<T>(
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actual: T,
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expected: T,
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msg?: string,
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): void;
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export function assertNotStrictEquals(
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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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return;
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}
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throw new AssertionError(
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msg ?? `Expected "actual" to be strictly unequal to: ${_format(actual)}\n`,
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);
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}
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/**
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* Make an assertion that actual is not null or undefined. If not
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* then thrown.
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*/
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export function assertExists(
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actual: unknown,
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msg?: string,
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): void {
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if (actual === undefined || actual === null) {
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if (!msg) {
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msg =
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`actual: "${actual}" expected to match anything but null or undefined`;
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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 includes expected. If not
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* then thrown.
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*/
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export function assertStringIncludes(
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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: "${actual}" expected to contain: "${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` includes the `expected` values.
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* If not then an error will be thrown.
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*
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* Type parameter can be specified to ensure values under comparison have the same type.
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* For example:
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*```ts
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*assertArrayIncludes<number>([1, 2], [2])
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*```
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*/
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export function assertArrayIncludes(
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actual: ArrayLike<unknown>,
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expected: ArrayLike<unknown>,
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msg?: string,
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): void;
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export function assertArrayIncludes<T>(
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actual: ArrayLike<T>,
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expected: ArrayLike<T>,
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msg?: string,
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): void;
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export function assertArrayIncludes(
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actual: ArrayLike<unknown>,
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expected: ArrayLike<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: "${_format(actual)}" expected to include: "${
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_format(expected)
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}"\nmissing: ${_format(missing)}`;
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}
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throw new AssertionError(msg);
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}
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/**
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* Make an assertion that `actual` match RegExp `expected`. If not
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* then thrown
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*/
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export function assertMatch(
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actual: string,
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expected: RegExp,
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msg?: string,
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): void {
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if (!expected.test(actual)) {
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if (!msg) {
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msg = `actual: "${actual}" expected to match: "${expected}"`;
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}
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throw new AssertionError(msg);
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}
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}
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/**
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* Make an assertion that `actual` not match RegExp `expected`. If match
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* then thrown
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*/
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export function assertNotMatch(
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actual: string,
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expected: RegExp,
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msg?: string,
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): void {
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if (expected.test(actual)) {
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if (!msg) {
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msg = `actual: "${actual}" expected to not 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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* Make an assertion that `actual` object is a subset of `expected` object, deeply.
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* If not, then throw.
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*/
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export function assertObjectMatch(
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actual: Record<PropertyKey, unknown>,
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expected: Record<PropertyKey, unknown>,
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): void {
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type loose = Record<PropertyKey, unknown>;
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const seen = new WeakMap();
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return assertEquals(
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(function filter(a: loose, b: loose): loose {
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// Prevent infinite loop with circular references with same filter
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if ((seen.has(a)) && (seen.get(a) === b)) {
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return a;
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}
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seen.set(a, b);
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// Filter keys and symbols which are present in both actual and expected
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const filtered = {} as loose;
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const entries = [
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...Object.getOwnPropertyNames(a),
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...Object.getOwnPropertySymbols(a),
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]
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.filter((key) => key in b)
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.map((key) => [key, a[key as string]]) as Array<[string, unknown]>;
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// Build filtered object and filter recursively on nested objects references
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for (const [key, value] of entries) {
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if (typeof value === "object") {
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const subset = (b as loose)[key];
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if ((typeof subset === "object") && (subset)) {
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filtered[key] = filter(value as loose, subset as loose);
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continue;
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}
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}
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filtered[key] = value;
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}
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return filtered;
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})(actual, expected),
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expected,
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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 ? `: ${msg}` : "."}`);
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}
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/**
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* Executes a function, expecting it to throw. If it does not, then it
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* throws. An error class and a string that should be included in the
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* error message can also be asserted.
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*/
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export function assertThrows<T = void>(
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fn: () => T,
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ErrorClass?: Constructor,
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msgIncludes = "",
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msg?: string,
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): Error {
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let doesThrow = false;
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let error = null;
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try {
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fn();
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} catch (e) {
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if (e instanceof Error === false) {
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throw new AssertionError("A non-Error object was thrown.");
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}
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if (ErrorClass && !(e instanceof ErrorClass)) {
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msg =
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`Expected error to be instance of "${ErrorClass.name}", but was "${e.constructor.name}"${
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msg ? `: ${msg}` : "."
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}`;
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throw new AssertionError(msg);
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}
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if (
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msgIncludes &&
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!stripColor(e.message).includes(stripColor(msgIncludes))
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) {
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msg =
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`Expected error message to include "${msgIncludes}", but got "${e.message}"${
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msg ? `: ${msg}` : "."
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}`;
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throw new AssertionError(msg);
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}
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doesThrow = true;
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error = e;
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}
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if (!doesThrow) {
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msg = `Expected function to throw${msg ? `: ${msg}` : "."}`;
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throw new AssertionError(msg);
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}
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return error;
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}
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|
|
/**
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* Executes a function which returns a promise, expecting it to throw or reject.
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* If it does not, then it throws. An error class and a string that should be
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* included in the error message can also be asserted.
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*/
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export async function assertThrowsAsync<T = void>(
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fn: () => Promise<T>,
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ErrorClass?: Constructor,
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msgIncludes = "",
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msg?: string,
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): Promise<Error> {
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let doesThrow = false;
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let error = null;
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try {
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await fn();
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} catch (e) {
|
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if (e instanceof Error === false) {
|
|
throw new AssertionError("A non-Error object was thrown or rejected.");
|
|
}
|
|
if (ErrorClass && !(e instanceof ErrorClass)) {
|
|
msg =
|
|
`Expected error to be instance of "${ErrorClass.name}", but got "${e.name}"${
|
|
msg ? `: ${msg}` : "."
|
|
}`;
|
|
throw new AssertionError(msg);
|
|
}
|
|
if (
|
|
msgIncludes &&
|
|
!stripColor(e.message).includes(stripColor(msgIncludes))
|
|
) {
|
|
msg =
|
|
`Expected error message to include "${msgIncludes}", but got "${e.message}"${
|
|
msg ? `: ${msg}` : "."
|
|
}`;
|
|
throw new AssertionError(msg);
|
|
}
|
|
doesThrow = true;
|
|
error = e;
|
|
}
|
|
if (!doesThrow) {
|
|
msg = `Expected function to throw${msg ? `: ${msg}` : "."}`;
|
|
throw new AssertionError(msg);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/** Use this to stub out methods that will throw when invoked. */
|
|
export function unimplemented(msg?: string): never {
|
|
throw new AssertionError(msg || "unimplemented");
|
|
}
|
|
|
|
/** Use this to assert unreachable code. */
|
|
export function unreachable(): never {
|
|
throw new AssertionError("unreachable");
|
|
}
|