Docker Selenium Grid in Selenium Java - Test Execution Trace

Test Overview

This test uses Docker Selenium Grid to run a browser test remotely. It opens a browser on the grid, navigates to a website, clicks a button, and checks if the page title is correct.

Test Code - JUnit 5

Selenium Java

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.remote.RemoteWebDriver;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.junit.jupiter.api.*;
import java.net.URL;

public class DockerSeleniumGridTest {
    private WebDriver driver;

    @BeforeEach
    public void setUp() throws Exception {
        DesiredCapabilities capabilities = new DesiredCapabilities();
        capabilities.setBrowserName("chrome");
        driver = new RemoteWebDriver(new URL("http://localhost:4444/wd/hub"), capabilities);
    }

    @Test
    public void testButtonClickChangesTitle() {
        driver.get("https://example.com");
        WebElement button = driver.findElement(By.id("changeTitleButton"));
        button.click();
        String title = driver.getTitle();
        Assertions.assertEquals("Title Changed", title);
    }

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

Execution Trace - 7 Steps

Step	Action	System State	Assertion	Result
1	Test starts and sets up RemoteWebDriver with Docker Selenium Grid URL and Chrome capabilities	Docker Selenium Grid is running locally on port 4444, ready to accept sessions	-	PASS
2	RemoteWebDriver opens Chrome browser on Selenium Grid node	Chrome browser instance launched remotely inside Docker container	-	PASS
3	Browser navigates to https://example.com	Page loads with expected content including button with id 'changeTitleButton'	-	PASS
4	Finds button element by id 'changeTitleButton'	Button element is present and interactable	-	PASS
5	Clicks the button to trigger title change	Page reacts and changes title to 'Title Changed'	-	PASS
6	Gets the page title after click	Title is 'Title Changed'	Assert that page title equals 'Title Changed'	PASS
7	Test ends and browser session is closed	Remote browser instance is terminated and resources freed	-	PASS

Failure Scenario

Failing Condition: Button with id 'changeTitleButton' is not found or page title does not change as expected

Execution Trace Quiz - 3 Questions

What does the RemoteWebDriver connect to in this test?

A A cloud testing service like Sauce Labs

B Docker Selenium Grid hub at http://localhost:4444/wd/hub

C Local Chrome browser on the test machine

D A local Selenium standalone server

Key Result

Using Docker Selenium Grid allows running tests on remote browsers in containers, enabling parallel and cross-browser testing without needing local browser installations.