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svelte/test/helpers.js

236 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));
} 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;
}
}
export const virtualConsole = new jsdom.VirtualConsole();
const { window } = new jsdom.JSDOM('<main></main>', {virtualConsole});
global.document = window.document;
global.getComputedStyle = window.getComputedStyle;
global.navigator = {userAgent: 'fake'};
export function env() {
window._svelteTransitionManager = null;
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(` ${i}: `) +
line.replace(/^\t+/, match => match.split('\t').join(' '))
);
})
.join('\n');
}
export function showOutput(cwd, options = {}, compile = svelte.compile) {
glob('**/*.svelte', { cwd }).forEach(file => {
if (file[0] === '_') return;
const { js } = compile(
fs.readFileSync(`${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<< ${colors.cyan().bold(file)}`
);
});
}
const start = /\n(\t+)/;
export function deindent(strings, ...values) {
const indentation = start.exec(strings[0])[1];
const pattern = new RegExp(`^${indentation}`, 'gm');
let result = strings[0].replace(start, '').replace(pattern, '');
let trailingIndentation = getTrailingIndentation(result);
for (let i = 1; i < strings.length; i += 1) {
let expression = values[i - 1];
const string = strings[i].replace(pattern, '');
if (Array.isArray(expression)) {
expression = expression.length ? expression.join('\n') : null;
}
if (expression || expression === '') {
const value = String(expression).replace(
/\n/g,
`\n${trailingIndentation}`
);
result += value + string;
} else {
let c = result.length;
while (/\s/.test(result[c - 1])) c -= 1;
result = result.slice(0, c) + string;
}
trailingIndentation = getTrailingIndentation(result);
}
return result.trim().replace(/\t+$/gm, '');
}
function getTrailingIndentation(str) {
let i = str.length;
while (str[i - 1] === ' ' || str[i - 1] === '\t') i -= 1;
return str.slice(i, str.length);
}
export function spaces(i) {
let result = '';
while (i--) result += ' ';
return result;
}