BaseTest.java

package tests;

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.chrome.ChromeOptions;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import pages.*;

import java.time.Duration;

public class BaseTest {

    WebDriver driver;
    LoginPage loginPage;
    ProductsPage productsPage;
    CheckoutInfo checkoutInfo;
    CompletePage completePage;
    OverviewPage overviewPage;
    CartPage cartPage;

    @BeforeMethod
    public void setup() {
        ChromeOptions options = new ChromeOptions();
//        options.addArguments("--headless");
        options.addArguments("--start-maximized");
        driver = new ChromeDriver(options);
        driver.manage().timeouts().implicitlyWait(Duration.ofSeconds(10));
        loginPage = new LoginPage(driver);
        productsPage = new ProductsPage(driver);
        checkoutInfo = new CheckoutInfo(driver);
        completePage = new CompletePage(driver);
        overviewPage = new OverviewPage(driver);
        cartPage = new CartPage(driver);
    }

    @AfterMethod
    public void close() {
        driver.quit();
    }
}

CartPage.java

package pages;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;

public class CartPage {

    WebDriver driver;
    By checkoutButton = By.id("checkout");

    public CartPage(WebDriver driver) {
        this.driver = driver;
    }

    public CheckoutInfo clickCheckoutButton() {
        driver.findElement(checkoutButton).click();
        return new CheckoutInfo(driver);
    }
}

CheckoutInfo.java

package pages;

import dto.Customer;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;

public class CheckoutInfo {

    WebDriver driver;
    By firstNameField = By.id("first-name");
    By lastNameField = By.id("last-name");
    By zipCodeField = By.id("postal-code");
    By continueButton = By.id("continue");


    public CheckoutInfo(WebDriver driver) {
        this.driver = driver;
    }

    public CheckoutInfo writeInfo(Customer customer) {
        driver.findElement(firstNameField).sendKeys(customer.getFirstName());
        driver.findElement(lastNameField).sendKeys(customer.getLastName());
        driver.findElement(zipCodeField).sendKeys(customer.getZipCode());
        return this;
    }

    public OverviewPage clickContinue() {
        driver.findElement(continueButton).click();
        return new OverviewPage(driver);
    }
}

CheckOutTest.java

package tests;

import dto.Customer;
import org.testng.Assert;
import org.testng.annotations.Test;

import static org.testng.Assert.assertEquals;

public class CheckOutTest extends BaseTest {

    @Test
    public void checkoutTest() {
        Customer customer = new Customer("Ivan", "Petrov", "123456");

        loginPage.open()
                .login("standard_user", "secret_sauce")
                .addToCart("Sauce Labs Bolt T-Shirt")
                .addToCart("Sauce Labs Onesie")
                .clickToCart()
                .clickCheckoutButton()
                .writeInfo(customer)
                .clickContinue()
                .clickFinish();
        assertEquals(completePage.getFinishMessage(), "Thank you for your order!");
    }
}

CompletePage.java

package pages;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;

public class CompletePage {

    WebDriver driver;

    public CompletePage(WebDriver driver) {
        this.driver = driver;
    }

    public String getFinishMessage() {
        return driver.findElement(By.xpath("//*[@class = 'complete-header']")).getText();
    }
}

Customer.java

package dto;

public class Customer {

    String firstName;
    String lastName;
    String zipCode;

    public Customer(String firstName, String lastName, String zipCode) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.zipCode = zipCode;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getZipCode() {
        return zipCode;
    }

    public void setZipCode(String zipCode) {
        this.zipCode = zipCode;
    }
}

LoginPage.java

package pages;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;

public class LoginPage {

    WebDriver driver;
    By loginField = By.name("user-name");
    By passwordField = By.id("password");
    By loginButton = By.id("login-button");
    By errorMessage = By.cssSelector("[data-test=error]");

    public LoginPage(WebDriver driver) {
        this.driver = driver;
    }

    public LoginPage open() {
        driver.get("https://www.saucedemo.com/");
        return this;
    }

    public void loginNegative(String user, String password) {
        driver.findElement(loginField).sendKeys(user);
        driver.findElement(passwordField).sendKeys(password);
        driver.findElement(loginButton).click();
    }

    public ProductsPage login(String user, String password) {
        driver.findElement(loginField).sendKeys(user);
        driver.findElement(passwordField).sendKeys(password);
        driver.findElement(loginButton).click();
        return new ProductsPage(driver);
    }

    public String getErrorMessage() {
        return driver.findElement(errorMessage).getText();
    }
}

LoginTest.java

package tests;

import org.testng.Assert;
import org.testng.annotations.Test;

public class LoginTest extends BaseTest {

    @Test
    public void checkNegativeLoginWithEmptyUsername() {
        loginPage.open();
        loginPage.loginNegative("", "secret_sauce");
        Assert.assertEquals(loginPage.getErrorMessage(), "Epic sadface: Username is required");
    }

    @Test
    public void checkNegativeLoginWithEmptyPassword() {
        loginPage.open();
        loginPage.loginNegative("standard_user", "");
        Assert.assertEquals(loginPage.getErrorMessage(), "Epic sadface: Password is required");
    }

    @Test
    public void checkNegativeLogin() {
        loginPage.open();
        loginPage.loginNegative("standard_user", "12345678");
        Assert.assertEquals(loginPage.getErrorMessage(), "Epic sadface: Username and password do not match any user in this service");
    }

    @Test
    public void checkPositiveLogin() {
        loginPage.open();
        loginPage.login("standard_user", "secret_sauce");
        Assert.assertTrue(productsPage.isPageOpened());
    }
}

OverviewPage.java

package pages;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;

public class OverviewPage {

    WebDriver driver;
    By finishButton = By.id("finish");

    public OverviewPage(WebDriver driver) {
        this.driver = driver;
    }

    public CompletePage clickFinish() {
        driver.findElement(finishButton).click();
        return new CompletePage(driver);
    }
}

ProductsPage.java

package pages;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;

public class ProductsPage {

    WebDriver driver;
    By title = By.cssSelector("[data-test=title]");
    By cartLink = By.id("shopping_cart_container");
    String addToCart = "//div[text()='%s']/ancestor::div[@class='inventory_item']//button";

    public ProductsPage(WebDriver driver) {
        this.driver = driver;
    }

    public boolean isPageOpened() {
        return driver.findElement(title).isDisplayed();
    }

    public CartPage clickToCart() {
        driver.findElement(cartLink).click();
        return new CartPage(driver);
    }

    public ProductsPage addToCart(String product) {
        driver.findElement(By.xpath(String.format(addToCart, product))).click();
        return this;
    }
}