info-verbosity-off.test.js

"use strict";

jest.setTimeout(10E6);
/* eslint-disable node/no-unsupported-features  */
/* eslint-disable node/no-unsupported-features/es-syntax  */
const fs = require("fs");
const path = require("path");
const { extractSummary, extractHash, appendDataIfFileExists, runAndGetWatchProc, copyFile } = require("../../../testUtils");

const fileToChange = "index.js";
const fileToChangePath = path.resolve(__dirname, fileToChange);
var copyFilePath;

// create copy of "index.js" => "index_copy.js"
beforeEach(() => {
	copyFilePath = copyFile(__dirname, fileToChange);
});

afterEach(() => {
	try {
		// subsequent test-case runs won't pass as snapshot is not matched
		// hence, deleting the file as it is modified by the test
		fs.unlinkSync(fileToChangePath);
	} catch (e) {
		console.warn("could not remove the file:" + fileToChangePath + "\n" + e.message);
	} finally {
		fs.renameSync(copyFilePath, fileToChangePath);
	}
});

test("info-verbosity-off", async done => {
	var webpackProc = runAndGetWatchProc(__dirname, [
		"--entry ",
		"./index.js",
		"--config",
		"./webpack.config.js",
		"--output-filename",
		"[name].js",
		"--output-chunk-filename",
		"[id].chunk.js",
		"--target",
		"async-node",
		"--watch",
		"--info-verbosity",
		"none"
	]);

	// info-verbosity none spits the output in one go.
	// So we only need to keep a track of when we change the files
	// 1. Hash and other info
	// 2. (file changed) Hash and other info

	var chunkNumber = 0;
	var hash1, hash2;
	var summary;

	webpackProc.stdout.on("data", data => {
		data = data.toString();
		chunkNumber++;
		// We get webpack output after running test
		// Since we are running the webpack in watch mode, changing file will generate additional output
		// First time output will be validated fully
		// Hash of the The subsequent output will be tested against that of first time output

		switch (chunkNumber) {
			case 1:
				hash1 = extractHash(data);
				summary = extractSummary(data);

				expect(summary).not.toContain("webpack is watching the files…");
				expect(summary).toMatchSnapshot();

				// change file
				appendDataIfFileExists(__dirname, fileToChange, "//junk-comment");

				break;
			case 2:
				hash2 = extractHash(data);

				expect(hash2.hash).not.toBe(hash1.hash);

				webpackProc.kill();
				done();

				break;
			default:
				break;
		}
	});

	webpackProc.stderr.on("data", error => {
		// fail test case if there is any error
		done(error.toString());
	});
});