protractor-screenshot-extension
Version:
An extension for Protractor that allows testing visual screenshots
193 lines • 23.6 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
import * as tslib_1 from "tslib";
import { createWriteStream, existsSync, readFileSync } from 'fs';
import { PNG } from 'pngjs';
import { browser } from 'protractor';
/** @type {?} */
const pixelmatch = require('pixelmatch');
/** @type {?} */
const shell = require('shelljs');
/**
* @record
*/
export function IRectangle() { }
if (false) {
/** @type {?} */
IRectangle.prototype.x;
/** @type {?} */
IRectangle.prototype.y;
/** @type {?} */
IRectangle.prototype.w;
/** @type {?} */
IRectangle.prototype.h;
}
/**
* @record
*/
export function IScreenshotOptions() { }
if (false) {
/** @type {?|undefined} */
IScreenshotOptions.prototype.ignoreRectangles;
/** @type {?|undefined} */
IScreenshotOptions.prototype.ignoreElements;
/** @type {?|undefined} */
IScreenshotOptions.prototype.threshold;
/** @type {?|undefined} */
IScreenshotOptions.prototype.includeAA;
}
/** @type {?} */
const actualDirectory = 'actual';
/** @type {?} */
const diffDirectory = 'diff';
/** @type {?} */
const baselineDirectory = 'baseline';
export class ProtractorScreenshotExtension {
/**
* @param {?} screenshotDirectory
*/
constructor(screenshotDirectory) {
this._screenshotDirectory = screenshotDirectory;
if (this._screenshotDirectory.slice(-1) === '/') {
this._screenshotDirectory = this._screenshotDirectory.slice(0, -1);
}
// Create all 3 subfolders.
shell.mkdir('-p', `${screenshotDirectory}/${actualDirectory}`);
shell.mkdir('-p', `${screenshotDirectory}/${diffDirectory}`);
shell.mkdir('-p', `${screenshotDirectory}/${baselineDirectory}`);
}
/**
* @param {?} element
* @param {?} tag
* @param {?=} options
* @return {?}
*/
checkElementScreenshot(element, tag, options) {
return tslib_1.__awaiter(this, void 0, void 0, function* () {
/** @type {?} */
const baselineImagePath = `${this._screenshotDirectory}/${baselineDirectory}/${tag}.png`;
if (!existsSync(baselineImagePath)) {
console.log(`Saving baseline image: ${baselineImagePath}`);
/** @type {?} */
let screenshot = Buffer.from(yield element.takeScreenshot(), 'base64');
screenshot = yield this._addBlackoutRectangles(screenshot, options, element);
/** @type {?} */
const stream = createWriteStream(baselineImagePath);
stream.write(screenshot);
stream.end();
return 0;
}
/** @type {?} */
let testScreenshotBuffer = Buffer.from(yield element.takeScreenshot(), 'base64');
testScreenshotBuffer = yield this._addBlackoutRectangles(testScreenshotBuffer, options, element);
/** @type {?} */
const testScreenshotPng = PNG.sync.read(testScreenshotBuffer);
/** @type {?} */
const baselineScreenshotPng = PNG.sync.read(readFileSync(baselineImagePath));
/** @type {?} */
const diffPng = new PNG({ width: baselineScreenshotPng.width, height: baselineScreenshotPng.height });
/** @type {?} */
const numberOfPixelsDifferent = pixelmatch(testScreenshotPng.data, baselineScreenshotPng.data, diffPng.data, baselineScreenshotPng.width, baselineScreenshotPng.height, {
threshold: options ? options.threshold : undefined,
includeAA: options ? options.includeAA : undefined
});
if (!!numberOfPixelsDifferent) {
/** @type {?} */
const diffImagePath = `${this._screenshotDirectory}/${diffDirectory}/${tag}.png`;
/** @type {?} */
const actualImagePath = `${this._screenshotDirectory}/${actualDirectory}/${tag}.png`;
createWriteStream(actualImagePath).write(testScreenshotBuffer);
diffPng.pack().pipe(createWriteStream(diffImagePath));
}
return numberOfPixelsDifferent;
});
}
/**
* @param {?} tag
* @param {?=} options
* @return {?}
*/
checkPageScreenshot(tag, options) {
return this.checkElementScreenshot(browser, tag, options);
}
/**
* @private
* @param {?} image
* @param {?} x
* @param {?} y
* @param {?} w
* @param {?} h
* @return {?}
*/
_blackoutRectangle(image, x, y, w, h) {
// Create a black image that will be used for blacking out regions to be ignored.
/** @type {?} */
const blackPng = new PNG({ width: w, height: h });
for (let i = 0; i < blackPng.height; i++) {
for (let j = 0; j < blackPng.width; j++) {
/** @type {?} */
const idx = (blackPng.width * i + j) * 4;
blackPng.data[idx] = 0; // red
blackPng.data[idx + 1] = 0; // blue
blackPng.data[idx + 2] = 0; // green
blackPng.data[idx + 3] = 255; // alpha
}
}
blackPng.bitblt(image, 0, 0, w, h, x, y);
}
/**
* @private
* @param {?} imageBuffer
* @param {?=} options
* @param {?=} parentElement
* @return {?}
*/
_addBlackoutRectangles(imageBuffer, options, parentElement) {
return tslib_1.__awaiter(this, void 0, void 0, function* () {
if (options && (options.ignoreRectangles || options.ignoreElements)) {
/** @type {?} */
const imagePng = PNG.sync.read(imageBuffer);
if (options.ignoreRectangles && options.ignoreRectangles.length) {
options.ignoreRectangles.forEach((rect) => {
this._blackoutRectangle(imagePng, rect.x, rect.y, rect.w, rect.h);
});
}
if (options.ignoreElements && options.ignoreElements.length) {
// Using `map` instead of `forEach` in order to await all async calls.
yield Promise.all(options.ignoreElements.map((ignoreElement) => tslib_1.__awaiter(this, void 0, void 0, function* () {
/** @type {?} */
let parentLocation = { x: 0, y: 0 };
if (!!parentElement.getLocation) {
// If an ElementFinder was passed in, call `getLocation()`, otherwise assume the whole browser was passed in.
parentLocation = yield parentElement.getLocation();
}
/** @type {?} */
const ignoreLocation = yield ignoreElement.getLocation();
/** @type {?} */
const ignoreSize = yield ignoreElement.getSize();
// Adjust coordinates, as the screenshot can be twice the viewport size for high resolution displays.
/** @type {?} */
const parentSize = parentElement.driver
? yield parentElement.driver.manage().window().getSize()
: yield parentElement.getSize();
/** @type {?} */
const conversionFactor = imagePng.width / parentSize.width;
this._blackoutRectangle(imagePng, (ignoreLocation.x - parentLocation.x) * conversionFactor, (ignoreLocation.y - parentLocation.y) * conversionFactor, ignoreSize.width * conversionFactor, ignoreSize.height * conversionFactor);
})));
}
return PNG.sync.write(imagePng);
}
return imageBuffer;
});
}
}
if (false) {
/**
* @type {?}
* @private
*/
ProtractorScreenshotExtension.prototype._screenshotDirectory;
}
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{ createWriteStream, existsSync, readFileSync } from 'fs';\nimport { PNG } from 'pngjs';\nimport { browser, ElementFinder, ProtractorBrowser } from 'protractor';\nconst pixelmatch = require('pixelmatch');\nconst shell = require('shelljs');\n\nexport interface IRectangle {\n    x: number;\n    y: number;\n    w: number;\n    h: number;\n}\n\nexport interface IScreenshotOptions {\n    ignoreRectangles?: IRectangle[];\n    ignoreElements?: ElementFinder[];\n    threshold?: number; // between 0 and 1\n    includeAA?: boolean;\n}\n\nconst actualDirectory = 'actual';\nconst diffDirectory = 'diff';\nconst baselineDirectory = 'baseline';\n\nexport class ProtractorScreenshotExtension {\n    private _screenshotDirectory: string;\n\n    constructor(screenshotDirectory: string) {\n        this._screenshotDirectory = screenshotDirectory;\n        if (this._screenshotDirectory.slice(-1) === '/') {\n            this._screenshotDirectory = this._screenshotDirectory.slice(0, -1);\n        }\n        // Create all 3 subfolders.\n        shell.mkdir('-p', `${screenshotDirectory}/${actualDirectory}`);\n        shell.mkdir('-p', `${screenshotDirectory}/${diffDirectory}`);\n        shell.mkdir('-p', `${screenshotDirectory}/${baselineDirectory}`);\n    }\n\n    public async checkElementScreenshot(\n        element: ElementFinder | ProtractorBrowser,\n        tag: string,\n        options?: IScreenshotOptions\n    ): Promise<number> {\n        const baselineImagePath = `${this._screenshotDirectory}/${baselineDirectory}/${tag}.png`;\n        if (!existsSync(baselineImagePath)) {\n            console.log(`Saving baseline image: ${baselineImagePath}`);\n            let screenshot = Buffer.from(await element.takeScreenshot(), 'base64');\n            screenshot = await this._addBlackoutRectangles(screenshot, options, element);\n            const stream = createWriteStream(baselineImagePath);\n            stream.write(screenshot);\n            stream.end();\n            return 0;\n        }\n        let testScreenshotBuffer = Buffer.from(await element.takeScreenshot(), 'base64');\n        testScreenshotBuffer = await this._addBlackoutRectangles(testScreenshotBuffer, options, element);\n        const testScreenshotPng = PNG.sync.read(testScreenshotBuffer);\n        const baselineScreenshotPng = PNG.sync.read(readFileSync(baselineImagePath));\n        const diffPng = new PNG({ width: baselineScreenshotPng.width, height: baselineScreenshotPng.height });\n        const numberOfPixelsDifferent = pixelmatch(\n            testScreenshotPng.data,\n            baselineScreenshotPng.data,\n            diffPng.data,\n            baselineScreenshotPng.width,\n            baselineScreenshotPng.height,\n            {\n                threshold: options ? options.threshold : undefined,\n                includeAA: options ? options.includeAA : undefined\n            }\n        );\n        if (!!numberOfPixelsDifferent) {\n            const diffImagePath = `${this._screenshotDirectory}/${diffDirectory}/${tag}.png`;\n            const actualImagePath = `${this._screenshotDirectory}/${actualDirectory}/${tag}.png`;\n            createWriteStream(actualImagePath).write(testScreenshotBuffer);\n            diffPng.pack().pipe(createWriteStream(diffImagePath));\n        }\n        return numberOfPixelsDifferent;\n    }\n\n    public checkPageScreenshot(tag: string, options?: IScreenshotOptions): Promise<number> {\n        return this.checkElementScreenshot(browser, tag, options);\n    }\n\n    private _blackoutRectangle(image: PNG, x: number, y: number, w: number, h: number): void {\n        // Create a black image that will be used for blacking out regions to be ignored.\n        const blackPng = new PNG({ width: w, height: h });\n        for (let i = 0; i < blackPng.height; i++) {\n            for (let j = 0; j < blackPng.width; j++) {\n                const idx = (blackPng.width * i + j) * 4;\n                blackPng.data[idx] = 0;         // red\n                blackPng.data[idx + 1] = 0;     // blue\n                blackPng.data[idx + 2] = 0;     // green\n                blackPng.data[idx + 3] = 255;   // alpha\n            }\n        }\n\n        blackPng.bitblt(image, 0, 0, w, h, x, y);\n    }\n\n    private async _addBlackoutRectangles (\n        imageBuffer: Buffer,\n        options?: IScreenshotOptions,\n        parentElement?: ElementFinder | ProtractorBrowser\n    ): Promise<Buffer> {\n        if (options && (options.ignoreRectangles || options.ignoreElements)) {\n            const imagePng = PNG.sync.read(imageBuffer);\n\n            if (options.ignoreRectangles && options.ignoreRectangles.length) {\n                options.ignoreRectangles.forEach((rect) => {\n                    this._blackoutRectangle(imagePng, rect.x, rect.y, rect.w, rect.h);\n                });\n            }\n            if (options.ignoreElements && options.ignoreElements.length) {\n                // Using `map` instead of `forEach` in order to await all async calls.\n                await Promise.all(options.ignoreElements.map(async (ignoreElement) => {\n                    let parentLocation = { x: 0, y: 0 };\n                    if (!!parentElement.getLocation) {\n                        // If an ElementFinder was passed in, call `getLocation()`, otherwise assume the whole browser was passed in.\n                        parentLocation = await parentElement.getLocation();\n                    }\n                    const ignoreLocation = await ignoreElement.getLocation();\n                    const ignoreSize = await ignoreElement.getSize();\n                    // Adjust coordinates, as the screenshot can be twice the viewport size for high resolution displays.\n                    const parentSize = parentElement.driver \n                        ? await parentElement.driver.manage().window().getSize() \n                        : await parentElement.getSize();\n                    const conversionFactor = imagePng.width / parentSize.width;\n                    this._blackoutRectangle(\n                        imagePng,\n                        (ignoreLocation.x - parentLocation.x) * conversionFactor,\n                        (ignoreLocation.y - parentLocation.y) * conversionFactor,\n                        ignoreSize.width * conversionFactor, ignoreSize.height * conversionFactor\n                    );\n                }));\n            }\n\n            return PNG.sync.write(imagePng);\n        }\n\n        return imageBuffer;\n    }\n}\n"]}