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svelte/test/helpers.js

240 lines
5.3 KiB

import * as jsdom from 'jsdom';
import * as assert from 'assert';
import * as glob from 'tiny-glob/sync.js';
import * as fs from 'fs';
import * as colors from 'kleur';
// for coverage purposes, we need to test source files,
// but for sanity purposes, we need to test dist files
export function loadSvelte(test) {
process.env.TEST = test ? 'true' : '';
const resolved = require.resolve('../compiler.js');
delete require.cache[resolved];
return require(resolved);
}
export const svelte = loadSvelte();
export function exists(path) {
try {
fs.statSync(path);
return true;
} catch (err) {
return false;
}
}
export function tryToLoadJson(file) {
try {
return JSON.parse(fs.readFileSync(file, 'utf-8'));
} catch (err) {
if (err.code !== 'ENOENT') throw err;
return null;
}
}
export function tryToReadFile(file) {
try {
return fs.readFileSync(file, 'utf-8');
} catch (err) {
if (err.code !== 'ENOENT') throw err;
return null;
}
}
const virtualConsole = new jsdom.VirtualConsole();
virtualConsole.sendTo(console);
const window = new jsdom.JSDOM('<main></main>', {virtualConsole}).window;
global.document = window.document;
global.navigator = window.navigator;
global.getComputedStyle = window.getComputedStyle;
global.requestAnimationFrame = null; // placeholder, filled in using set_raf
global.window = window;
// add missing ecmascript globals to window
for (const key of Object.getOwnPropertyNames(global)) {
window[key] = window[key] || global[key];
}
// implement mock scroll
window.scrollTo = function(pageXOffset, pageYOffset) {
window.pageXOffset = pageXOffset;
window.pageYOffset = pageYOffset;
};
export function env() {
window.document.title = '';
window.document.body.innerHTML = '<main></main>';
return window;
}
function cleanChildren(node) {
let previous = null;
// sort attributes
const attributes = Array.from(node.attributes).sort((a, b) => {
return a.name < b.name ? -1 : 1;
});
attributes.forEach(attr => {
node.removeAttribute(attr.name);
});
attributes.forEach(attr => {
node.setAttribute(attr.name, attr.value);
});
// recurse
[...node.childNodes].forEach(child => {
if (child.nodeType === 3) {
// text
if (
node.namespaceURI === 'http://www.w3.org/2000/svg' &&
node.tagName !== 'text' &&
node.tagName !== 'tspan'
) {
node.removeChild(child);
}
child.data = child.data.replace(/\s+/g, '\n');
if (previous && previous.nodeType === 3) {
previous.data += child.data;
previous.data = previous.data.replace(/\s+/g, '\n');
node.removeChild(child);
child = previous;
}
} else {
cleanChildren(child);
}
previous = child;
});
// collapse whitespace
if (node.firstChild && node.firstChild.nodeType === 3) {
node.firstChild.data = node.firstChild.data.replace(/^\s+/, '');
if (!node.firstChild.data) node.removeChild(node.firstChild);
}
if (node.lastChild && node.lastChild.nodeType === 3) {
node.lastChild.data = node.lastChild.data.replace(/\s+$/, '');
if (!node.lastChild.data) node.removeChild(node.lastChild);
}
}
export function normalizeHtml(window, html) {
try {
const node = window.document.createElement('div');
node.innerHTML = html
.replace(/<!--.*?-->/g, '')
.replace(/>[\s\r\n]+</g, '><')
.trim();
cleanChildren(node);
return node.innerHTML.replace(/<\/?noscript\/?>/g, '');
} catch (err) {
throw new Error(`Failed to normalize HTML:\n${html}`);
}
}
export function setupHtmlEqual() {
const window = env();
assert.htmlEqual = (actual, expected, message) => {
assert.deepEqual(
normalizeHtml(window, actual),
normalizeHtml(window, expected),
message
);
};
}
export function loadConfig(file) {
try {
const resolved = require.resolve(file);
delete require.cache[resolved];
const config = require(resolved);
return config.default || config;
} catch (err) {
if (err.code === 'MODULE_NOT_FOUND') {
return {};
}
throw err;
}
}
export function addLineNumbers(code) {
return code
.split('\n')
.map((line, i) => {
i = String(i + 1);
while (i.length < 3) i = ` ${i}`;
return (
colors.gray(` ${i}: `) +
line.replace(/^\t+/, match => match.split('\t').join(' '))
);
})
.join('\n');
}
export function showOutput(cwd, options = {}, compile = svelte.compile) {
glob('**/*.svelte', { cwd }).forEach(file => {
if (file[0] === '_') return;
try {
const { js } = compile(
fs.readFileSync(`${cwd}/${file}`, 'utf-8'),
Object.assign(options, {
filename: file
})
);
console.log( // eslint-disable-line no-console
`\n>> ${colors.cyan().bold(file)}\n${addLineNumbers(js.code)}\n<< ${colors.cyan().bold(file)}`
);
} catch (err) {
console.log(`failed to generate output: ${err.message}`);
}
});
}
export function shouldUpdateExpected() {
return process.argv.includes('--update');
}
export function spaces(i) {
let result = '';
while (i--) result += ' ';
return result;
}
// fake timers
const original_set_timeout = global.setTimeout;
export function useFakeTimers() {
const callbacks = [];
global.setTimeout = function(fn) {
callbacks.push(fn);
};
return {
flush() {
callbacks.forEach(fn => fn());
callbacks.splice(0, callbacks.length);
},
removeFakeTimers() {
callbacks.splice(0, callbacks.length);
global.setTimeout = original_set_timeout;
}
};
}