Parallel execution configuration in Selenium Java - Test Execution Trace

Test Overview

This test demonstrates how to configure and run Selenium tests in parallel using TestNG. It verifies that two tests run simultaneously on different browsers and both pass successfully.

Test Code - TestNG

Selenium Java

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.testng.Assert;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Parameters;
import org.testng.annotations.Test;

public class ParallelTest {
    private WebDriver driver;

    @BeforeMethod
    @Parameters({"browser"})
    public void setUp(String browser) {
        if (browser.equalsIgnoreCase("chrome")) {
            driver = new ChromeDriver();
        } else if (browser.equalsIgnoreCase("firefox")) {
            driver = new FirefoxDriver();
        }
        driver.manage().window().maximize();
    }

    @Test
    public void openGoogle() {
        driver.get("https://www.google.com");
        String title = driver.getTitle();
        Assert.assertTrue(title.contains("Google"));
    }

    @AfterMethod
    public void tearDown() {
        if (driver != null) {
            driver.quit();
        }
    }
}

/* TestNG XML configuration for parallel execution:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd">
<suite name="ParallelSuite" parallel="tests" thread-count="2">
  <test name="ChromeTest">
    <parameter name="browser" value="chrome"/>
    <classes>
      <class name="ParallelTest"/>
    </classes>
  </test>
  <test name="FirefoxTest">
    <parameter name="browser" value="firefox"/>
    <classes>
      <class name="ParallelTest"/>
    </classes>
  </test>
</suite>
*/

Execution Trace - 8 Steps

Step	Action	System State	Assertion	Result
1	TestNG suite starts with parallel tests configured for Chrome and Firefox browsers	TestNG initializes two test threads for ChromeTest and FirefoxTest	-	PASS
2	ChromeTest thread calls setUp with parameter 'chrome', ChromeDriver instance is created and browser window maximized	Chrome browser window is open and ready	-	PASS
3	FirefoxTest thread calls setUp with parameter 'firefox', FirefoxDriver instance is created and browser window maximized	Firefox browser window is open and ready	-	PASS
4	ChromeTest thread navigates to https://www.google.com	Chrome browser displays Google homepage	Page title contains 'Google'	PASS
5	FirefoxTest thread navigates to https://www.google.com	Firefox browser displays Google homepage	Page title contains 'Google'	PASS
6	ChromeTest thread calls tearDown and closes Chrome browser	Chrome browser is closed	-	PASS
7	FirefoxTest thread calls tearDown and closes Firefox browser	Firefox browser is closed	-	PASS
8	TestNG suite completes with both tests passing in parallel	No browsers open, test suite finished	Both tests passed successfully	PASS

Failure Scenario

Failing Condition: If the browser driver executable is missing or the browser fails to launch

Execution Trace Quiz - 3 Questions

What does the @Parameters annotation do in this test?

A It closes the browser after the test

B It passes the browser name to the setUp method to decide which browser to launch

C It runs the test only once regardless of browser

D It maximizes the browser window

Key Result

Configuring parallel execution in TestNG requires setting parameters in the XML suite file and using parameterized setup methods to launch different browsers simultaneously, improving test speed and coverage.