Why does DevOps recommend Shift Left Principles

Shift Left principles help teams detect and resolve issues earlier in the development lifecycle to improve efficiency and reduce costs. They rely on automation, early feedback, and continuous monitoring to catch problems before they become costly to fix.

This article explains shift-left testing fundamentals and why DevOps recommends shift-left testing principles. It also covers how to implement shift-left testing and its best practices.

What is Shift Left Testing

Shift-Left Testing is the general practice of moving testing, quality assurance, and performance evaluation activities to the “left” of the traditional software development lifecycle. The ultimate goal of shift-left testing is to detect and resolve issues early to avoid needing to rework the codebase later on, thereby ensuring on-time delivery of the product and increasing overall development velocity and reliability.

It embraces the DevOps principle of Test Early, and Test Often and helps anticipate changes during a development process that can affect product performance or other delivery processes. Shift-Left should ideally start even before the codebase is created and begin the verification of APIs, container configurations, microservice interactions, etc., from the base technical documentation itself.

Sometimes, Shift Left testing can incorporate practices pertaining to BDD-like testing as well and implement templates to determine whether the nature of the product being created is the same as the client expectations as encapsulated in the business requirements. Ultimately shift left ensures that there is consistency between the product developed and the design envisioned.

Why does DevOps recommend Shift Left Principles

The main goal of DevOps is to ensure the creation of a sustainable infrastructure and ensure highly scalable application delivery at increased velocities.

When, as in traditional models, testing is bracketed towards the end of the development cycle, there are two main challenges:

1. Increased cost of fixing the bugs
2. Increased complexity of resolving the defects and thus reduced product velocity

These will now be discussed in greater detail:

1. Shift Left Reduces the Cost of Fixing Defects

A NIST study has shown that resolving defects during production can cost up to 30 times more than resolving it in the development phase.

Bugs identified during development are easier to fix than those uncovered in production because these code units are relatively small and more manageable. Once these are merged into the main branch, the scope widens as it becomes similar to finding a needle in a haystack. The greater dependencies also cause issues in defect resolution.

Since it is easier to detect bugs earlier, it is easier to implement corrective steps and strategies to resolve these issues and improve the overall quality of the software development process while maintaining a high codebase quality

2. Shift Left Improves Overall Product Release Velocity.

Since it is relatively easier to detect bugs early on in the development process, the strategies of Shift Left can be adopted to ensure that issues are identified as early as possible and the overall quality of the product can be maintained from the get-go.

Agile processes prioritize short sprints with well-defined deliverables. These need to be fully functional and adhere to the business and functional specifications for the set of user stories involved.

If the focus on quality starts early on, the stakeholders can be reasonably confident that all the code that is being shipped matches the functional as well as non-functional specifications.

A Shift-Left Approach fosters a greater understanding of the business requirements, software design, architecture, and coding best practices from the get go. This allows business analysts, developers, and testers to ask tough questions and seek the necessary clarifications before going ahead.

This in-depth involvement and understanding allows QA’s to obtain end-to-end knowledge about the application and experiment on various scenarios based on how the software is likely to behave. This leads to an overall robust development and design process as well, which is absent in traditional models.

Perhaps, an even more significant outcome is the fact that Software Quality becomes embedded in the overall company culture, and it builds a sense of responsibility in developers, DevOps engineers, BA’s, Managers and even high level business stakeholders.

How to Implement Shift Left in a DevOps Setting?

It is not difficult to implement Shift Left Principles in any DevOps process. All it needs is a few simple steps:

1. Include developers in QA Activities

Developers and testers can coordinate to ensure that code snippets are tested before being merged to the main branch. This ensures quality at the grassroots level and helps resolve bugs before they can affect other parts of the code.

2. Provide testers with some coding knowledge

DevOps ideally requires developers to know about testing, and vice versa. Though neither group is expected to be proficient at a high level in these tasks, it increases the overall release velocity as developers can now perform basic tests, and QA’s can help with some quick fixes.

3. Include testers in the Development process from an early stage

Shift Left performs optimally when QA’s are involved from the initial sessions themselves. Having an understanding of how the app is being designed and built allows QA’s to plan a proactive Continuous Testing process and focus on any vulnerabilities in design.

4. Increase the scope of automation

Automation is absolutely key to implementing a successful Shift Left Practice in any DevOps process.

One of the main reasons testing was traditionally done at the end of software development was the fact that manual testing processes are too slow to provide relevant feedback in a short enough time frame for it to be incorporated in Agile sprints.

Test automation has been proven to play a key role in Product Release Velocity.

A very apparent example comes from regression tests. Once any bug has been identified during a sprint, the changes are made, and the new code is then pushed into the system. However, before these changes can be merged into production, they need to undergo regression tests in order to ensure that the intended functionality works seamlessly. Automation testing can help significantly reduce the test run time and allow for quick turnarounds.

Simply Signup for Free and start running your Automation Tests on BrowserStack Automate, and connect your popular devOps pipeline. BrowserStack supports integrations with CICD tools such as Jenkins, Travis CI, CircleCI, Azure, GitLab, Bamboo, etc.

The power of Parallel Testing can be used to further increase the benefits reaped from test automation. A test automation suite which takes 90 mins to run, can be executed in a mere 30 minutes by running them in 3 parallels.

Run Automation DevOps tests on Real Devices

5. Test on Real Devices: All tests, including unit tests, need to be conducted on real devices for optimum results. Testing is only 100% effective when the tests are executed under real user conditions. Emulators/Simulators and Virtual Machines cannot fully replicate the specific conditions under which devices operate and thus, their results do not inspire sufficient confidence to push the code to production.

For both manual testing and automated Selenium testing, real device testing is absolutely crucial in obtaining reliable results. Organizations prefer cloud-based testing infrastructure in order to avoid the prohibitive costs of setting up an in-house lab.

Advantages of Shift Left Principles

Applying Shift Left Principles in DevOps offers the following benefits:

1. It reduces costs as bugs are now detected earlier and are cheaper to fix.
2. It improves the overall product quality due to an increased efficiency in the software development process.
3. It increases product release velocity as the codebase is now more robust and ready for deployment.
4. It enhances security by identifying vulnerabilities at the initial stages rather than during later testing phases.
5. It improves test coverage by incorporating automated testing across various development stages.
6. It ensures better compliance with industry standards by integrating security and regulatory checks early.

Best Practices in Shift Left Testing

It is not enough to simply consider Shifting Left in terms of DevOps. Some best practices need to be kept in mind for the same –

1. Early planning is needed to successfully Shift Left: Once the basic requirements have been identified, all stakeholders must identify a process to accommodate Shit Left strategies into the mix. Test Planning and Creating Test Strategies are crucial for Shift Left implementation.

2. Static Code Analysis: It is used to analyze the code without executing it and offers a primary check for:

• Programming-related errors
• Code standard violations
• Anomalies in the syntax
• Issues with codebase security

3. Create Continuous Feedback Loops: The primary purpose of shift left testing is to be able to close the gaps in communication between testers and developers and resolve defects early in the process. Creating a constructive feedback channel is key to implementing this behaviour.

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Conclusion

Shift Left testing leads to a robust and error-free development process and prevents bugs from blowing up right before production. It reduces the time and effort required to resolve defects and generates a greater degree of confidence in the overall development process.

To implement Shift Left effectively, teams need reliable testing infrastructure that enables early and continuous testing. BrowserStack provides a real device cloud platform that allows teams to test on thousands of real browsers and devices. This helps catch issues early and ensure seamless cross-browser and cross-device compatibility.

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