webpack/test/HotTestCases.test.js

"use strict";

require("should");
const path = require("path");
const fs = require("fs");
const vm = require("vm");
const Test = require("mocha/lib/test");
const ExtractTextPlugin = require("extract-text-webpack-plugin");
const checkArrayExpectation = require("./checkArrayExpectation");

const webpack = require("../lib/webpack");

describe("HotTestCases", () => {
	const casesPath = path.join(__dirname, "hotCases");
	let categories = fs.readdirSync(casesPath).filter((dir) =>
		fs.statSync(path.join(casesPath, dir)).isDirectory());
	categories = categories.map((cat) => {
		return {
			name: cat,
			tests: fs.readdirSync(path.join(casesPath, cat)).filter((folder) => folder.indexOf("_") < 0)
		};
	});
	categories.forEach((category) => {
		describe(category.name, () => {
			category.tests.forEach((testName) => {
				const suite = describe(testName, function() {
					this.timeout(10000);
				});
				it(testName + " should compile", (done) => {
					const testDirectory = path.join(casesPath, category.name, testName);
					const outputDirectory = path.join(__dirname, "js", "hot-cases", category.name, testName);
					const recordsPath = path.join(outputDirectory, "records.json");
					if(fs.existsSync(recordsPath))
						fs.unlinkSync(recordsPath);
					const fakeUpdateLoaderOptions = {
						updateIndex: 0
					};
					const configPath = path.join(testDirectory, "webpack.config.js");
					let options = {};
					if(fs.existsSync(configPath))
						options = require(configPath);
					if(!options.mode) options.mode = "development";
					if(!options.context) options.context = testDirectory;
					if(!options.entry) options.entry = "./index.js";
					if(!options.output) options.output = {};
					if(!options.output.path) options.output.path = outputDirectory;
					if(!options.output.filename) options.output.filename = "bundle.js";
					if(options.output.pathinfo === undefined) options.output.pathinfo = true;
					if(!options.module) options.module = {};
					if(!options.module.rules) options.module.rules = [];
					options.module.rules.push({
						test: /\.js$/,
						loader: path.join(__dirname, "hotCases", "fake-update-loader.js"),
						enforce: "pre"
					}, {
						test: /\.css$/,
						use: ExtractTextPlugin.extract({
							fallback: "style-loader",
							use: "css-loader"
						})
					});
					if(!options.target) options.target = "async-node";
					if(!options.plugins) options.plugins = [];
					options.plugins.push(
						new webpack.HotModuleReplacementPlugin(),
						new webpack.NamedModulesPlugin(),
						new webpack.LoaderOptionsPlugin(fakeUpdateLoaderOptions),
						new ExtractTextPlugin("bundle.css")
					);
					if(!options.recordsPath) options.recordsPath = recordsPath;
					const compiler = webpack(options);
					compiler.run((err, stats) => {
						if(err) return done(err);
						const jsonStats = stats.toJson({
							errorDetails: true
						});
						if(checkArrayExpectation(testDirectory, jsonStats, "error", "Error", done)) return;
						if(checkArrayExpectation(testDirectory, jsonStats, "warning", "Warning", done)) return;
						let exportedTests = 0;

						function _it(title, fn) {
							const test = new Test(title, fn);
							suite.addTest(test);
							exportedTests++;
							return test;
						}

						function _next(callback) {
							fakeUpdateLoaderOptions.updateIndex++;
							compiler.run((err, stats) => {
								if(err) return done(err);
								const jsonStats = stats.toJson({
									errorDetails: true
								});
								if(checkArrayExpectation(testDirectory, jsonStats, "error", "errors" + fakeUpdateLoaderOptions.updateIndex, "Error", done)) return;
								if(checkArrayExpectation(testDirectory, jsonStats, "warning", "warnings" + fakeUpdateLoaderOptions.updateIndex, "Warning", done)) return;
								if(callback) callback(jsonStats);
							});
						}

						function _require(module) {
							if(module.substr(0, 2) === "./") {
								const p = path.join(outputDirectory, module);
								const fn = vm.runInThisContext("(function(require, module, exports, __dirname, __filename, it, NEXT, STATS) {" + fs.readFileSync(p, "utf-8") + "\n})", p);
								const m = {
									exports: {}
								};
								fn.call(m.exports, _require, m, m.exports, outputDirectory, p, _it, _next, jsonStats);
								return m.exports;
							} else return require(module);
						}
						_require("./bundle.js");
						if(exportedTests < 1) return done(new Error("No tests exported by test case"));
						process.nextTick(done);
					});
				});
			});
		});
	});
});