Code Example - Test Login Form

package com.seleniumWebdriver;

import java.util.concurrent.TimeUnit;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.testng.Assert;
import org.testng.annotations.AfterTest;
import org.testng.annotations.BeforeTest;
import org.testng.annotations.Test;


/**
 * @Blog Name : Selenium Code Example
 * @author Deepak Gupta
 * @Created Date 8-08-2017
 *
 */

public class TestLoginForm {

WebDriver driver;

@BeforeTest
public void setUp() {
System.setProperty("webdriver.gecko.driver", System.getProperty("user.dir") + "/drivers/geckodriver.exe");
driver = new FirefoxDriver();
driver.get("https://github.com/login");
driver.manage().window().maximize();
driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);

}

@Test
public void verifyInvalidCredentials() throws InterruptedException {

driver.findElement(By.id("login_field")).sendKeys("deepak");
driver.findElement(By.id("password")).sendKeys("testing");
driver.findElement(By.name("commit")).click();

String actual = driver.findElement(By.xpath("//*[@id='js-flash-container']/div")).getText();
System.out.println("Actual Error message is: " + actual);
// Verify the actual and expected error message.
Assert.assertEquals(actual, "Incorrect username or password.");
}

@AfterTest
public void tearDown() {
driver.quit();
}

}