webpack/test/checkArrayExpectation.js

"use strict";
const fs = require("fs");
const path = require("path");

const check = (expected, actual) => {
	if(expected instanceof RegExp) {
		expected = { message: expected };
	}
	return Object.keys(expected).every(key => {
		let value = actual[key];
		if(typeof value === "object") {
			value = JSON.stringify(value);
		}
		return expected[key].test(value);
	})
}

const explain = object => {
	if(object instanceof RegExp) {
		object = { message: object };
	}
	return Object.keys(object).map(key => {
		let value = object[key];
		if(typeof value === "object" && !(value instanceof RegExp)) {
			value = JSON.stringify(value);
		}
		let msg = `${key} = ${value}`
		if(msg.length > 100) msg = msg.slice(0, 97) + "...";
		return msg;
	}).join("; ");
}

module.exports = function checkArrayExpectation(
	testDirectory,
	object,
	kind,
	filename,
	upperCaseKind,
	done
) {
	if (!done) {
		done = upperCaseKind;
		upperCaseKind = filename;
		filename = `${kind}s`;
	}
	let array = object[`${kind}s`];
	if (Array.isArray(array)) {
		if (kind === "warning"){
			array = array.filter(item => !/from Terser/.test(item));
		}
	}
	if (fs.existsSync(path.join(testDirectory, `${filename}.js`))) {
		const expectedFilename = path.join(testDirectory, `${filename}.js`);
		const expected = require(expectedFilename);
		if (expected.length < array.length) {
			return (
				done(
					new Error(
						`More ${kind}s while compiling than expected:\n\n${array.map(explain).join(
							"\n\n"
						)}. Check expected ${kind}s: ${expectedFilename}`
					)
				),
				true
			);
		} else if (expected.length > array.length) {
			return (
				done(
					new Error(
						`Less ${kind}s while compiling than expected:\n\n${array.map(explain).join(
							"\n\n"
						)}. Check expected ${kind}s: ${expectedFilename}`
					)
				),
				true
			);
		}
		for (let i = 0; i < array.length; i++) {
			if (Array.isArray(expected[i])) {
				for (let j = 0; j < expected[i].length; j++) {
					if (!check(expected[i][j], array[i])) {
						return (
							done(
								new Error(
									`${upperCaseKind} ${i}: ${explain(array[i])} doesn't match ${explain(expected[
										i
									][j])}`
								)
							),
							true
						);
					}
				}
			} else if (!check(expected[i], array[i]))
				return (
					done(
						new Error(
							`${upperCaseKind} ${i}: ${explain(array[i])} doesn't match ${explain(expected[
								i
							])}`
						)
					),
					true
				);
		}
	} else if (array.length > 0) {
		return (
			done(
				new Error(`${upperCaseKind}s while compiling:\n\n${array.map(explain).join("\n\n")}`)
			),
			true
		);
	}
};