Debugging flaky test failures: A 2500+ word guide to taking screenshots in Cucumber

Test automation is crucial for Continuous Testing and meeting demands for faster delivery of quality software. However, even with a strong automated test suite, experiencing flaky failures can slow down development teams.

Having visibility into why tests are failing can be very valuable for debugging. This is where taking screenshots for failed test scenarios comes in handy!

In this detailed guide, we will explore how to automatically take screenshots in Cucumber when a test case does not pass.

Understanding Behavior Driven Development

But first, let‘s provide some context on what Cucumber is. Cucumber is a popular open-source framework that supports Behavior Driven Development or BDD.

The key principle behind BDD is bridging the communication gap between technical and non-technical teams. With BDD:

• Business analysts write acceptance tests
• Testers implement those tests
• Developers gain insights into intended system behavior

This collaborative effort is facilitated using a simple domain-specific language called Gherkin. Gherkin allows writing test cases that can be easily understood by everyone in plain English language structured as reusable steps.

Here are some of the advantages of BDD:

• Improves requirement clarity
• Standardizes acceptance criteria
• Enables early defect detection
• Fosters better cross-functional teamwork

Now that we have the context, let‘s see where screenshots come into the picture.

Role of screenshots in failed test debugging

When executing test automation suites, it is inevitable that some tests will fail unexpectedly. This can happen due to:

• Application bugs
• Test suite flaws
• Environment issues

Debugging the root cause quickly becomes important, This is where screenshots provide value.

Here are the key benefits of capturing screenshots for failed Cucumber scenarios:

• Provides visual context around the failure
• Accelerates root causing flow
• Clarifies bug reports with images
• Enables developer collaboration
• Improves reporting and metrics collection

Overall, screenshots translate into faster resolution of flaky test cases.

Challenges with cross browser test automation

Now that we see the utility of screenshots, let‘s also appreciate why writing reliable automated browser tests can be hard.

When delivering web applications and Customer-facing products, they need to work seamlessly across diverse desktop and mobile environments.

This cross browser compatibility requires exhaustive testing on different:

• Browser types and versions – Chrome, Safari, Edge etc.
• Operating Systems – Windows, MacOS, iOS, Android
• Device types – Laptops, Phones, Tablets

Manually validating web application functionality on so many environments is slow, cumbersome and error-prone.

This is why intelligent test automation and cloud infrastructure become crucial.

As per Gartner‘s forecasts:

• 60% of application development will incorporate continuous testing principles by 2023
• Global spending on cloud testing services will reach $20 billion by 2026

Next, let‘s explore how we can leverage cloud platforms to run BDD test suites written in Cucumber against thousands of real browser environments.

Introducing BrowserStack device cloud

BrowserStack provides instant access to 3000+ real mobile devices and browsers spread across global data centers.

Some key details around the device cloud:

Metric	Count
Real Mobile Devices	1000+
Desktop Browsers	1500+
Browser Versions	10+ years
Operating Systems	Mainstream varieties
Local Testing	Developer laptop browser access
Global Data Centers	Fast test execution across infra

This high fidelity device lab enables running true cross browser testing at scale.

Now let‘s get into the implementation section where we will configure Cucumber to take automatic screenshots when tests fail while leveraging the power of BrowserStack device cloud.

Step-by-step guide: Enabling failed test screenshots

Let‘s explore this tutorial in an incremental section-by-section manner:

Step 1: Set up a Cucumber project

Ensure the latest JDK is installed and an IDE like Eclipse or IntelliJ is configured.

Create a Maven or Gradle project for build and dependency management.

Add core Cucumber-JVM libraries:

cucumber-java
cucumber-junit

For browser automation, include Selenium WebDriver:

selenium-java
webdrivermanager

This sets up the foundation.

Step 2: Create feature files

Feature files contain Gherkin test scenarios under the /features folder:

Feature: Login feature  

  Scenario: Successful login
    Given User is on login page
    When Enters valid username and password 
    Then Navigated to the home page

We will keep adding more scenarios to this file.

Step 3: Implement step definitions

Step definition classes map Gherkin steps to executable glue code:

@Given("User is on login page")
public void open_login_page() {
  // Write code to launch browser 
  // and open app login URL
}  

This binds the test automation framework.

Step 4: Configure Cucumber runner

The runner class ties together feature files with step definitions:

@RunWith(Cucumber.class)
@CucumberOptions(
  features = "src/test/resources/features",
  glue = "stepDefinitions" 
)

This wiring allows Cucumber to run the BDD tests.

Step 5: Create hooks for taking screenshots

Hook methods provide execution context actions. We will utilize @After hook which runs after each test scenario:

@After  
public void takeScreenshot(Scenario scenario){

  if(scenario.isFailed()) {

    //Code to take screenshot on failure

  }
}

This sets the foundation to capture screenshots for failed scenarios.

Step 6: Configure plugin listener for reporting

Update @CucumberOptions in runner class to enable integration with reporting frameworks:

@CucumberOptions(
 plugin = {"com.aventstack.extentreports.cucumber.adapter.ExtentCucumberAdapter:"}  
)

This allows embedding images into Extent Reports.

Step 7: Define screenshot output directory

In extent-config.xml, specify the folder path for captured screenshots:

<extentreports>

  <!-- output directory -->
  <screenshotdir>test-output/screenshots</screenshotdir>

</extentreports>

This completes the configuration steps. Next, let‘s look at executing our BDD test suites across real desktop and mobile browsers at scale.

Level up with cloud test execution

While we set up local Cucumber execution, running automated tests across thousands of real device browser combinations takes this to the next level.

Cloud testing platforms like BrowserStack enable parallel test execution which reduces test cycles:

Some benefits of running UI test automation on BrowserStack:

✅ Local debugging capabilities

✅ Dedicated device access

✅ Test failure screenshots

✅ Link logs, reports and videos

✅ Root cause analysis

✅ CI/CD integrations

This facilitates taking screenshots for failed Cucumber test scenarios across diverse environments.

Now let‘s look at some best practices around test analytics that can supplement debugging…

Analyzing test failure trends

While screenshots provide contextual failure visibility, looking at historical test trends is also beneficial for diagnosing flaky tests.

Some key practices around test analytics:

• Track failure rates across test suites
• Break down reliability by test types
• Compare trends across cycles
• Associate failures to code commits
• Tag environment details to failures
• Relate defects to test scenarios

Rich analytics provides insights to tune overall quality processes.

Tips for debugging flaky test failures

Here are some additional tips for debugging failures:

✔️ Inspect stack trace error messages

✔️ Add strategic logging in test code

✔️ Retry failures before reporting

✔️ Isolate test data and enviornment dependancies

✔️ Request screen recordings for non-reproducable issues

✔️ Discuss observations with developers on priority

Systematically isolating the root cause accelerates fixing flaky tests.

And that brings us to the end of this comprehensive guide!

We went through multiple facets around taking automated screenshots for failed Cucumber test scenarios to streamline debugging, explored scale through BrowserStack device cloud, looked at analytics best practices and supplementary tactics for test troubleshooting.

I hope you found this detailed walkthrough helpful. Feel free to provide any feedback or ask follow-up questions.

Happy test automation!