/* eslint-env jest*/

const compareImages = require("../compareImages");

const fs = require("fs");

const util = require("util");

const readFile = util.promisify(fs.readFile);

describe("compareImages", () => {

test("Buffers data", async () => {

const readImg1 = readFile("./demoassets/People.jpg");

const readImg2 = readFile("./demoassets/People2.jpg");

const readComparison = readFile("./nodejs-tests/assets/PeopleComparedToPeople2.png");

const data = await compareImages(await readImg1, await readImg2);

const buffer = data.getBuffer();

const comparison = await readComparison;

expect(data.isSameDimensions).toBe(true);

expect(data.misMatchPercentage).toEqual("8.66");

expect(buffer).toBeInstanceOf(Buffer);

expect(buffer.length).toBe(91876);

expect(buffer.equals(comparison)).toBe(true);

});

test("Buffer data includeOriginal", async () => {

const readImg1 = readFile("./demoassets/People.jpg");

const readImg2 = readFile("./demoassets/People2.jpg");

const readComparison = readFile("./nodejs-tests/assets/PeopleComparedToPeople2WithOriginal.png");

const data = await compareImages(await readImg1, await readImg2);

const buffer = data.getBuffer(true);

const comparison = await readComparison;

expect(buffer.equals(comparison)).toBe(true);

});

test("throws when failed", async () => {

const promise = compareImages(fs.readFileSync("./demoassets/People.jpg"), "bogus data");

await expect(promise).rejects.toMatch("Failed to load image 'bogus data'. Error: ENOENT, No such file or directory 'bogus data'");

});

test("throws when invalid image format", async () => {

const invalidImageFormat = "data:,";

const promise = compareImages(invalidImageFormat, fs.readFileSync("./demoassets/People.jpg"));

await expect(promise).rejects.toMatch("Failed to load image 'data:,'. Error: Unsupported image type");

});

test("returns early", async () => {

const readImg1 = readFile("./demoassets/People.jpg");

const readImg2 = readFile("./demoassets/People2.jpg");

const options = {

returnEarlyThreshold: 5

};

const data = await compareImages(await readImg1, await readImg2, options);

expect(data.misMatchPercentage).toEqual("5.00");

});

});