webpack/test/ConfigTestCases.test.js

"use strict";

const path = require("path");
const fs = require("graceful-fs");
const vm = require("vm");
const rimraf = require("rimraf");
const checkArrayExpectation = require("./checkArrayExpectation");
const createLazyTestEnv = require("./helpers/createLazyTestEnv");
const deprecationTracking = require("./helpers/deprecationTracking");
const FakeDocument = require("./helpers/FakeDocument");

const webpack = require("..");
const prepareOptions = require("./helpers/prepareOptions");

describe("ConfigTestCases", () => {
	const casesPath = path.join(__dirname, "configCases");
	let categories = fs.readdirSync(casesPath);

	jest.setTimeout(20000);

	categories = categories.map(cat => {
		return {
			name: cat,
			tests: fs
				.readdirSync(path.join(casesPath, cat))
				.filter(folder => {
					return folder.indexOf("_") < 0;
				})
				.sort()
				.filter(testName => {
					const testDirectory = path.join(casesPath, cat, testName);
					const filterPath = path.join(testDirectory, "test.filter.js");
					if (fs.existsSync(filterPath) && !require(filterPath)()) {
						describe.skip(testName, () => {
							it("filtered", () => {});
						});
						return false;
					}
					return true;
				})
		};
	});
	categories.forEach(category => {
		describe(category.name, () => {
			category.tests.forEach(testName => {
				describe(testName, function() {
					const testDirectory = path.join(casesPath, category.name, testName);
					const outputDirectory = path.join(
						__dirname,
						"js",
						"config",
						category.name,
						testName
					);
					it(
						testName + " should compile",
						() =>
							new Promise((resolve, reject) => {
								const done = err => {
									if (err) return reject(err);
									resolve();
								};
								rimraf.sync(outputDirectory);
								fs.mkdirSync(outputDirectory, { recursive: true });
								const options = prepareOptions(
									require(path.join(testDirectory, "webpack.config.js")),
									{ testPath: outputDirectory }
								);
								const optionsArr = [].concat(options);
								optionsArr.forEach((options, idx) => {
									if (!options.context) options.context = testDirectory;
									if (!options.mode) options.mode = "production";
									if (!options.optimization) options.optimization = {};
									if (options.optimization.minimize === undefined)
										options.optimization.minimize = false;
									if (!options.entry) options.entry = "./index.js";
									if (!options.target) options.target = "async-node";
									if (!options.output) options.output = {};
									if (!options.output.path)
										options.output.path = outputDirectory;
									if (typeof options.output.pathinfo === "undefined")
										options.output.pathinfo = true;
									if (!options.output.filename)
										options.output.filename = "bundle" + idx + ".js";
								});
								let testConfig = {
									findBundle: function(i, options) {
										const ext = path.extname(options.output.filename);
										if (
											fs.existsSync(
												path.join(options.output.path, "bundle" + i + ext)
											)
										) {
											return "./bundle" + i + ext;
										}
									},
									timeout: 30000
								};
								try {
									// try to load a test file
									testConfig = Object.assign(
										testConfig,
										require(path.join(testDirectory, "test.config.js"))
									);
								} catch (e) {
									// ignored
								}
								if (testConfig.timeout) setDefaultTimeout(testConfig.timeout);

								const deprecationTracker = deprecationTracking.start();
								webpack(options, (err, stats) => {
									if (err) {
										const fakeStats = {
											errors: [
												{
													message: err.message,
													stack: err.stack
												}
											]
										};
										if (
											checkArrayExpectation(
												testDirectory,
												fakeStats,
												"error",
												"Error",
												done
											)
										)
											return;
										// Wait for uncaught errors to occur
										return setTimeout(done, 200);
									}
									const statOptions = {
										preset: "verbose",
										colors: false
									};
									fs.mkdirSync(outputDirectory, { recursive: true });
									fs.writeFileSync(
										path.join(outputDirectory, "stats.txt"),
										stats.toString(statOptions),
										"utf-8"
									);
									const jsonStats = stats.toJson({
										errorDetails: true
									});
									fs.writeFileSync(
										path.join(outputDirectory, "stats.json"),
										JSON.stringify(jsonStats, null, 2),
										"utf-8"
									);
									if (
										checkArrayExpectation(
											testDirectory,
											jsonStats,
											"error",
											"Error",
											done
										)
									)
										return;
									if (
										checkArrayExpectation(
											testDirectory,
											jsonStats,
											"warning",
											"Warning",
											done
										)
									)
										return;
									const deprecations = deprecationTracker();
									if (
										checkArrayExpectation(
											testDirectory,
											{ deprecations },
											"deprecation",
											"Deprecation",
											done
										)
									)
										return;

									const globalContext = {
										console: console,
										expect: expect,
										setTimeout: setTimeout,
										clearTimeout: clearTimeout,
										document: new FakeDocument(),
										location: {
											href: "https://test.cases/path/index.html",
											origin: "https://test.cases",
											toString() {
												return "https://test.cases/path/index.html";
											}
										}
									};

									function _require(currentDirectory, options, module) {
										if (Array.isArray(module) || /^\.\.?\//.test(module)) {
											let content;
											let p;
											if (Array.isArray(module)) {
												p = path.join(currentDirectory, ".array-require.js");
												content = `module.exports = (${module
													.map(arg => {
														return `require(${JSON.stringify(`./${arg}`)})`;
													})
													.join(", ")});`;
											} else {
												p = path.join(currentDirectory, module);
												content = fs.readFileSync(p, "utf-8");
											}
											const m = {
												exports: {}
											};
											let runInNewContext = false;
											const moduleScope = {
												require: _require.bind(null, path.dirname(p), options),
												importScripts: _require.bind(
													null,
													path.dirname(p),
													options
												),
												module: m,
												exports: m.exports,
												__dirname: path.dirname(p),
												__filename: p,
												it: _it,
												beforeEach: _beforeEach,
												afterEach: _afterEach,
												expect,
												jest,
												_globalAssign: { expect },
												__STATS__: jsonStats,
												nsObj: m => {
													Object.defineProperty(m, Symbol.toStringTag, {
														value: "Module"
													});
													return m;
												}
											};
											if (
												options.target === "web" ||
												options.target === "webworker"
											) {
												moduleScope.window = globalContext;
												moduleScope.self = globalContext;
												runInNewContext = true;
											}
											if (testConfig.moduleScope) {
												testConfig.moduleScope(moduleScope);
											}
											const args = Object.keys(moduleScope).join(", ");
											if (!runInNewContext)
												content = `Object.assign(global, _globalAssign); ${content}`;
											const code = `(function({${args}}) {${content}\n})`;
											const fn = runInNewContext
												? vm.runInNewContext(code, globalContext, p)
												: vm.runInThisContext(code, p);
											fn.call(m.exports, moduleScope);
											return m.exports;
										} else if (
											testConfig.modules &&
											module in testConfig.modules
										) {
											return testConfig.modules[module];
										} else return require(module);
									}
									let filesCount = 0;

									if (testConfig.noTests) return process.nextTick(done);
									if (testConfig.beforeExecute) testConfig.beforeExecute();
									const results = [];
									for (let i = 0; i < optionsArr.length; i++) {
										const bundlePath = testConfig.findBundle(i, optionsArr[i]);
										if (bundlePath) {
											filesCount++;
											results.push(
												_require(outputDirectory, optionsArr[i], bundlePath)
											);
										}
									}
									// give a free pass to compilation that generated an error
									if (
										!jsonStats.errors.length &&
										filesCount !== optionsArr.length
									)
										return done(
											new Error(
												"Should have found at least one bundle file per webpack config"
											)
										);
									Promise.all(results)
										.then(() => {
											if (testConfig.afterExecute) testConfig.afterExecute();
											if (getNumberOfTests() < filesCount) {
												return done(
													new Error("No tests exported by test case")
												);
											}
											done();
										})
										.catch(done);
								});
							})
					);

					const {
						it: _it,
						beforeEach: _beforeEach,
						afterEach: _afterEach,
						setDefaultTimeout,
						getNumberOfTests
					} = createLazyTestEnv(jasmine.getEnv(), 10000);
				});
			});
		});
	});
});