BaseTest.java

package tests;

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
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;
    CartPage cartPage;
    InfoPage infoPage;
    OverviewPage overviewPage;
    CompletePage completePage;

    @BeforeMethod
    public void setup() {
        driver = new ChromeDriver();
        driver.manage().window().maximize();
        driver.manage().timeouts().implicitlyWait(Duration.ofSeconds(20));
        loginPage = new LoginPage(driver);
        productsPage = new ProductsPage(driver);
        cartPage = new CartPage(driver);
        infoPage = new InfoPage(driver);
        overviewPage = new OverviewPage(driver);
        completePage = new CompletePage(driver);
    }

    @AfterMethod(alwaysRun = true)
    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 InfoPage clickCheckout() {
        driver.findElement(checkoutButton).click();
        return new InfoPage(driver);
    }
}

CheckoutTest.java

package tests;

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

public class CheckoutTest extends BaseTest {

    @Test
    public void checkoutTest() throws InterruptedException {
        loginPage.open()
                .login("standard_user", "secret_sauce")
                .addToCart("Sauce Labs Fleece Jacket")
                .addToCart("Sauce Labs Onesie")
                .clickToCart()
                .clickCheckout()
                .writeInfo("Тимофей", "Бородич", "220094")
                .clickContinue()
                .clickFinish();
        Assert.assertEquals(completePage.getMessage(), "Thank you for your order!");
    }
}

CompletePage.java

package pages;

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

public class CompletePage {

    WebDriver driver;
    By message = By.cssSelector(".complete-header");

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

    public String getMessage() {
        return driver.findElement(message).getText();
    }
}

InfoPage.java

package pages;

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

public class InfoPage {

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

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

    public InfoPage writeInfo(String firstName, String lastName, String zipCode) {
        driver.findElement(firstNameField).sendKeys(firstName);
        driver.findElement(lastNameField).sendKeys(lastName);
        driver.findElement(zipCodeField).sendKeys(zipCode);
        return this;
    }

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


}

LoginPage.java

package pages;

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

public class LoginPage {

    WebDriver driver;
    By usernameField = By.id("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 ProductsPage login(String user, String password) {
        driver.findElement(usernameField).sendKeys(user);
        driver.findElement(passwordField).sendKeys(password);
        driver.findElement(loginButton).click();
        return new ProductsPage(driver);
    }

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

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

LoginTest.java

package tests;

import org.openqa.selenium.By;
import org.testng.Assert;
import org.testng.annotations.Test;

public class LoginTest extends BaseTest {

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

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

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

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 cart = By.cssSelector(".shopping_cart_link");
    String productAddCart = "//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 ProductsPage addToCart (String product) {
        driver.findElement(By.xpath(String.format(productAddCart, product))).click();
        return this;
    }

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