svelte/test/runtime/index.js

import assert from "assert";
import * as path from "path";
import * as fs from "fs";
import * as acorn from "acorn";
import { transitionManager } from "../../shared.js";

import {
	showOutput,
	loadConfig,
	loadSvelte,
	env,
	setupHtmlEqual,
	spaces
} from "../helpers.js";

let svelte;

let compileOptions = null;

function getName(filename) {
	const base = path.basename(filename).replace(".html", "");
	return base[0].toUpperCase() + base.slice(1);
}

const Object_assign = Object.assign;

describe("runtime", () => {
	before(() => {
		svelte = loadSvelte(true);

		require.extensions[".html"] = function(module, filename) {
			const options = Object.assign(
				{ filename, name: getName(filename), format: 'cjs' },
				compileOptions
			);

			const { code } = svelte.compile(fs.readFileSync(filename, "utf-8"), options);

			return module._compile(code, filename);
		};

		return setupHtmlEqual();
	});

	const failed = new Set();

	function runTest(dir, shared, hydrate) {
		if (dir[0] === ".") return;

		const config = loadConfig(`./runtime/samples/${dir}/_config.js`);

		if (config.solo && process.env.CI) {
			throw new Error("Forgot to remove `solo: true` from test");
		}

		(config.skip ? it.skip : config.solo ? it.only : it)(`${dir} (${shared ? 'shared' : 'inline'} helpers)`, () => {
			if (failed.has(dir)) {
				// this makes debugging easier, by only printing compiled output once
				throw new Error('skipping test, already failed');
			}

			const cwd = path.resolve(`test/runtime/samples/${dir}`);

			compileOptions = config.compileOptions || {};
			compileOptions.shared = shared;
			compileOptions.hydratable = hydrate;
			compileOptions.dev = config.dev;

			// check that no ES2015+ syntax slipped in
			if (!config.allowES2015) {
				try {
					const source = fs.readFileSync(
						`test/runtime/samples/${dir}/main.html`,
						"utf-8"
					);
					const { code } = svelte.compile(source, compileOptions);
					const startIndex = code.indexOf("function create_main_fragment"); // may change!
					if (startIndex === -1)
						throw new Error("missing create_main_fragment");
					const es5 =
						code.slice(0, startIndex).split('\n').map(x => spaces(x.length)).join('\n') +
						code.slice(startIndex).replace(/export default .+/, "");
					acorn.parse(es5, { ecmaVersion: 5 });
				} catch (err) {
					failed.add(dir);
					showOutput(cwd, { shared }); // eslint-disable-line no-console
					throw err;
				}
			}

			Object.keys(require.cache)
				.filter(x => x.endsWith(".html"))
				.forEach(file => {
					delete require.cache[file];
				});

			let SvelteComponent;

			let unintendedError = null;

			const window = env();

			try {
				// set of hacks to support transition tests
				transitionManager.running = false;
				transitionManager.transitions = [];

				const raf = {
					time: 0,
					callback: null,
					tick: now => {
						raf.time = now;
						if (raf.callback) raf.callback();
					}
				};
				window.performance = { now: () => raf.time };
				global.requestAnimationFrame = cb => {
					let called = false;
					raf.callback = () => {
						if (!called) {
							called = true;
							cb();
						}
					};
				};

				global.window = window;

				try {
					SvelteComponent = require(`./samples/${dir}/main.html`);
				} catch (err) {
					showOutput(cwd, { shared }); // eslint-disable-line no-console
					throw err;
				}

				let usedObjectAssign = false;
				Object.assign = () => {
					usedObjectAssign = true;
				};

				global.window = window;

				// Put the constructor on window for testing
				window.SvelteComponent = SvelteComponent;

				const target = window.document.querySelector("main");

				const warnings = [];
				const warn = console.warn;
				console.warn = warning => {
					warnings.push(warning);
				};

				const component = new SvelteComponent({
					target,
					hydrate,
					data: config.data
				});

				Object.assign = Object_assign;

				console.warn = warn;

				if (config.error) {
					unintendedError = true;
					throw new Error("Expected a runtime error");
				}

				if (config.warnings) {
					assert.deepEqual(warnings, config.warnings);
				} else if (warnings.length) {
					unintendedError = true;
					throw new Error("Received unexpected warnings");
				}

				if (config.html) {
					assert.htmlEqual(target.innerHTML, config.html);
				}

				if (config.test) {
					config.test(assert, component, target, window, raf);
				} else {
					component.destroy();
					assert.equal(target.innerHTML, "");
				}

				if (usedObjectAssign) {
					throw new Error(
						"cannot use Object.assign in generated code, as it is not supported everywhere"
					);
				}
			} catch (err) {
				Object.assign = Object_assign;

				if (config.error && !unintendedError) {
					config.error(assert, err);
				} else {
					failed.add(dir);
					showOutput(cwd, { shared }); // eslint-disable-line no-console
					throw err;
				}
			}

			if (config.show) showOutput(cwd, { shared });
		});
	}

	const shared = path.resolve("shared.js");
	fs.readdirSync("test/runtime/samples").forEach(dir => {
		runTest(dir, shared, false);
		runTest(dir, shared, true);
		runTest(dir, null, false);
	});

	it("fails if options.target is missing in dev mode", () => {
		const { code } = svelte.compile(`<div></div>`, {
			format: "iife",
			name: "SvelteComponent",
			dev: true
		});

		const SvelteComponent = eval(
			`(function () { ${code}; return SvelteComponent; }())`
		);

		assert.throws(() => {
			new SvelteComponent();
		}, /'target' is a required option/);
	});

	it("fails if options.hydrate is true but the component is non-hydratable", () => {
		const { code } = svelte.compile(`<div></div>`, {
			format: "iife",
			name: "SvelteComponent",
			dev: true
		});

		const SvelteComponent = eval(
			`(function () { ${code}; return SvelteComponent; }())`
		);

		assert.throws(() => {
			new SvelteComponent({
				target: {},
				hydrate: true
			});
		}, /options.hydrate only works if the component was compiled with the `hydratable: true` option/);
	});
});