Network Throttling

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There might be instances where you would have to check the functionality of your website on low latency networks (2G/3G/LTE) or even offline. Such networks have variable upload and download speeds which can alter how your website performs on different browsers.

In order to validate your website on such network profiles, you can simulate these network conditions using our capabilities. If you want the test suite to start with the default network use our preset capabilities. However, the device will have unobstructed internet connectivity.

capabilities.setCapability("networkThrottling", "Regular 4G");

List Of Network Profiles

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CONDITION	MAX DOWNLOAD SPEED (KBPS)	MAX UPLOAD SPEED (KBPS)	LATENCY (MS)
Offline	0	0	0
Reset	Reset to default	Reset to default	Reset to default
GPRS	50	20	500
Regular 2G	250	50	300
Good 2G	450	150	150
Regular 3G	750	250	100
Good 3G	1 Mbps	750	20
Regular 4G	4 Mbps	3 Mbps	20
DSL	2 Mbps	1 Mbps	5

Custom Network Profile: For creating custom network conditions you can use objects. Define the upload speed, max download speed, and latency for the custom condition, as shown in the above table.

Configuring Network Profile

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The Selenium JavaScript Executor allows you to enable network simulation capabilities for tests and to generate custom log files. You can use conditional capabilities to simulate network conditions for individual test cases. driver.executeScript("lambda-throttle-network", throttleParams);

// Using executeScript to apply custom network throttling
Map<String, Object> throttleParams = Map.of(
    "download", 500,  // Maximum download speed in kbps
    "upload", 100,    // Maximum upload speed in kbps
    "latency", 30     // Latency in ms
);

driver.executeScript("lambda-throttle-network", throttleParams);

LambdaTest now allows you to select a network profile before running automation tests. This will allow you to conduct the functional tests of your website or web app on low/high latency networks and offline. In order to simulate the network conditions, you can use the networkProfile capability as shown below.

JAVASCRIPT EXECUTOR COMMAND	REQUEST PARAMETERS	EXAMPLE
networkProfile	condition: a string or object representing browser network conditions	driver.execute_script(“networkProfile”, {“condition”: {“download”: 500,“upload”: 100,“latency”: 30}})

Configuring Network Throttling In Test Automation

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To configure network throttling in automation, we have used the LambdaTest TestNG GitHub repository to run our automation tests. You would just have to define network throttle capabilities in your automation scripts.

Configuring Capabilities For Pre-defined Network Settings

DesiredCapabilities caps = new DesiredCapabilities();
caps.setCapability("browserName", "Chrome");
caps.setCapability("build", "Demo-TestNG");
caps.setCapability("name", "TestNG-Todo-Script-1");
caps.setCapability("networkThrottling", "Regular 4G");  //Set Network Speed to Regular 4G 

The following below is the TestNG code. It will validate your LambdaTest credentials for authentication purposes. The code will select the basic capabilities such as OS, browser, browser version, network, and so on.

Configuring Custom Network Settings

package com.lambdatest;

import java.net.MalformedURLException;
import java.net.URL;

import org.openqa.selenium.By;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.openqa.selenium.remote.RemoteWebDriver;
import org.testng.Assert;
import org.testng.annotations.AfterSuite;
import org.testng.annotations.BeforeSuite;
import org.testng.annotations.Test;

public class TestNGTodo1 {

    private RemoteWebDriver driver;
    private String Status="failed";

    @BeforeSuite
    public void setup() throws MalformedURLException {
        String username = System.getenv("LT_USERNAME");
        String authkey = System.getenv("LT_ACCESS_KEY");
        String hub = "@hub.lambdatest.com/wd/hub";

        DesiredCapabilities caps = new DesiredCapabilities();
        caps.setCapability("browserName", "Chrome");
        caps.setCapability("build", "Demo-TestNG");
        caps.setCapability("name", "TestNG-Todo-Script-1");
        caps.setCapability("networkThrottling", true);  //To enable network throttling
    
    driver = new RemoteWebDriver(new URL("https://" + username + ":" + authkey + hub), caps);

    // Custom network throttling using executeScript
        Map<String, Object> throttleParams = new HashMap<>();
        throttleParams.put("download", 500); // Maximum download speed in kbps
        throttleParams.put("upload", 100);   // Maximum upload speed in kbps
        throttleParams.put("latency", 30);   // Latency in ms
        
        // Use executeScript with the provided payload
        driver.executeScript("lambda-throttle-network", throttleParams);
    
    }


    @Test
    public void basicTest() throws InterruptedException {
        String spanText;
        System.out.println("Loading Url");
        Thread.sleep(100);
        driver.get("https://4dvanceboy.github.io/lambdatest/todo.html");
        Thread.sleep(100);

        System.out.println("Checking Box");
        driver.findElement(By.name("todo-1")).click();
        Thread.sleep(400);

        System.out.println("Checking Another Box");
        driver.findElement(By.name("todo-2")).click();
        Thread.sleep(400);

        System.out.println("Checking Box");
        driver.findElement(By.name("todo-3")).click();
        Thread.sleep(400);

        System.out.println("Checking Another Box");
        driver.findElement(By.name("todo-4")).click();
        Thread.sleep(400);

        driver.findElement(By.id("todotext")).sendKeys(" List Item 6");
        driver.findElement(By.id("addbutton")).click();
        Thread.sleep(200);

        driver.findElement(By.id("todotext")).sendKeys(" List Item 7");
        driver.findElement(By.id("addbutton")).click();
        Thread.sleep(200);

        driver.findElement(By.id("todotext")).sendKeys(" List Item 8");
        driver.findElement(By.id("addbutton")).click();
        Thread.sleep(200);

        System.out.println("Checking Another Box");
        driver.findElement(By.name("todo-1")).click();
        Thread.sleep(300);

        System.out.println("Checking Another Box");
        driver.findElement(By.name("todo-3")).click();
        Thread.sleep(300);

        System.out.println("Checking Another Box");
        driver.findElement(By.name("todo-7")).click();
        Thread.sleep(300);

        System.out.println("Checking Another Box");
        driver.findElement(By.name("todo-8")).click();
        Thread.sleep(300);

        System.out.println("Entering Text");
        driver.findElement(By.id("todotext")).sendKeys("Get Taste of Lambda and Stick to It");
        Thread.sleep(300);

        driver.findElement(By.id("addbutton")).click();

        System.out.println("Checking Another Box");
        driver.findElement(By.name("todo-9")).click();
        Thread.sleep(300);
        // Let's also assert that the todo we added is present in the list.

        spanText = driver.findElementByXPath("/html/body/div/div/div/ul/li[9]/span").getText();
        Assert.assertEquals("Get Taste of Lambda and Stick to It", spanText);
        Status="passed";
        Thread.sleep(150);

        System.out.println("TestFinished");

    }

    @AfterSuite
    public void tearDown() {
        driver.executeScript("lambda-status=" + Status);
        driver.quit();
    }

}

You can find your defined network capabilities under the section ‘Input Config’ by navigating to the ‘METADATA’ section of your automation build-logs.

In case you have any questions, feel free to share them with us.Our experts are available on 24/7 Customer chat support. You can also drop us a mail at support@lambdatest.com. Happy testing! 🙂