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bibliogram/test/screenshot.js
2020-07-23 00:58:21 +12:00

119 lines
3.5 KiB
JavaScript

const tap = require("tap")
const se = require("selenium-webdriver")
const firefox = require("selenium-webdriver/firefox")
const fs = require("fs").promises
const Jimp = require("jimp")
const commands = require("./screenshots/commands")
const child_process = require("child_process")
const constants = require("../src/lib/constants")
const browser = "firefox"
const port = 10407 + (+process.env.TAP_CHILD_ID)
constants.port = port
constants.request_backend = "saved" // predictable request results
const origin = `http://localhost:${port}`
constants.website_origin = origin
const dimensions = new Map([
["firefox", {
scrollbar: 12,
heightDifference: 74,
widthDifference: 0
}],
["chrome", {
scrollbar: 15,
heightDifference: 128,
widthDifference: 8
}]
])
const browserDimensions = dimensions.get(browser)
process.chdir("src/site")
const server = require("../src/site/server")
function exec(command) {
return new Promise((resolve, reject) => {
child_process.exec(command, (error, stdout, stderr) => {
resolve({stdout, stderr})
})
})
}
;(async () => {
await fs.mkdir("../../test/screenshots/diff", {recursive: true})
await fs.mkdir("../../test/screenshots/staging", {recursive: true})
const options = new firefox.Options()
// options.addArguments("-headless")
const [driver] = await Promise.all([
new se.Builder().forBrowser(browser).setFirefoxOptions(options).build(),
server.waitForFirstCompile()
])
server.muteLogsStartingWith("/") // we don't need webserver stuff in our test logs
function setSize(size) {
return driver.manage().window().setRect({
width: size.width + browserDimensions.widthDifference + browserDimensions.scrollbar,
height: size.height + browserDimensions.heightDifference
})
}
await driver.get(origin)
for (const command of commands) {
await Promise.all(Object.keys(command.cookies).map(cookieName =>
driver.manage().addCookie({
name: cookieName,
value: command.cookies[cookieName]
})
))
await setSize(command.size) // complete this before driver.get so that srcset doesn't get confused
await driver.get(origin + command.url)
for (let scrollNumber = 1; scrollNumber <= command.scrolls; scrollNumber++) {
const filenameWithScroll = `${command.filename}-${scrollNumber}`
function screenPath(dir) {
return `../../test/screenshots/${dir}/${filenameWithScroll}.png`
}
if (scrollNumber > 1) {
await driver.executeScript(`window.scrollByPages(1)`)
}
const finalExists = await fs.access(screenPath("final")).then(() => true).catch(() => false)
const screenshot = Buffer.from(await driver.takeScreenshot(), "base64")
const message = `equal screens: ${filenameWithScroll}`
tap.test(message, async childTest => {
const image = await Jimp.read(screenshot)
image.crop(0, 0, command.size.width, command.size.height) // crop out page scrollbar
if (finalExists) {
await image.writeAsync(screenPath("staging"))
const message = `screen: ${filenameWithScroll}`
const result = await exec(`compare -metric AE ${screenPath("staging")} ${screenPath("final")} ${screenPath("diff")}`)
const diff = +result.stderr
childTest.ok(diff === 0, message)
if (diff === 0) { // it worked, so we don't need the files anymore
fs.unlink(screenPath("staging"))
fs.unlink(screenPath("diff"))
}
} else {
image.writeAsync(screenPath("final"))
console.log(`note: creating new screenshot ${filenameWithScroll}`)
}
})
}
}
tap.teardown(() => {
driver.close()
server.shutdown()
})
})()