
Introduction
In this case study, we examine how a fintech company tackled development bottlenecks and team frustrations by improving integration testing strategies. The product had been on the market for over three years, with evolving functionalities to stay competitive and comply with industry regulations. However, the development team had changed over time, leaving only a few of the original members. Those who initially built the system had either transitioned to other projects or left the company entirely.
Our goal was to identify obstacles in the development process and address the primary source of frustration: the team’s lack of confidence in their releases. Productivity is multifaceted, but we focused on improving the stability of integration tests to ensure developers could deploy changes without fear of regression. To achieve this, we leveraged scenario-based development, allowing us to methodically identify the most impactful changes to improve team confidence and product stability.
Growth Trajectory and Challenges
With a live product, the company needed to continuously enhance its functionalities. However, the testing structure had become increasingly difficult to manage, making confident deployments a challenge. The testing process consisted of both API-level and UI-level tests, but key issues arose:
- UI tests covered only a fraction of the system’s full functionality, though they provided good coverage for the UI itself.
- API tests were divided into two categories: those testing exposed microservice endpoints and those testing endpoints accessed within microservices.
- The extent of actual functionality coverage was unclear.
- Tests within each service mixed unit tests with component tests, making it difficult to assess coverage and reliability.
- Many integration tests for the full system were undocumented and unstable, yet they were considered the baseline for existing functionality.
- These tests frequently failed due to specific configuration issues and lacked proper integration with deployed development and testing environments.
- The development team lacked confidence in their ability to introduce changes without breaking existing functionality.
Solution Identified Using Scenario-Based Development
To address these challenges, we used scenario-based development to systematically assess pain points and prioritize improvements. This approach helped us understand the broader impact of changes and determine the most effective solutions that would yield maximum benefits while minimizing disruption.
Rather than replacing the entire testing framework, which would have been costly and time-intensive, we focused on stabilizing existing tests and establishing a clear baseline for future development:
- Identifying Frequent Failures: We analyzed recurring test failures to understand their root causes.
- Defining a Baseline for Test Setup: By documenting and standardizing testing configurations, we reduced inconsistencies across environments.
- Streamlining Deployment and Testing Processes: We integrated tests more effectively within the development pipeline, ensuring they were reliable indicators of system stability.
- Prioritizing Fixes Based on Scenario Outcomes: By mapping out realistic development and testing scenarios, we determined which improvements would have the most immediate impact on developer confidence and product reliability.
The scenario-based development approach allowed us to build trust in the test suite so that developers could confidently implement changes without introducing defects. Over time, this foundational work could support further improvements in testing frameworks, but our immediate focus was on enabling steady and predictable releases.
Key Lessons Learned and Future Recommendations
This experience reinforced several key takeaways:
- Scenario-based development is a valuable tool for identifying high-impact changes. By mapping real-world use cases, we could determine the most urgent fixes.
- Stabilizing existing tests is often more effective than rebuilding from scratch. A complete overhaul may be tempting, but addressing the most immediate concerns first can provide immediate benefits.
- Clear documentation of test coverage is crucial. Without clarity on what tests cover, teams cannot confidently rely on them for validation.
- Integration tests should be reliable and properly configured in all environments. Frequent failures erode confidence and slow development.
- Empowering the team leads to long-term success. Providing developers with reliable tests enabled them to focus on building new features rather than debugging fragile tests.
Conclusion
By applying scenario-based development, we identified key issues and determined a practical solution that maximized benefits for both the team and their product. Addressing instability in the testing process helped the development team regain confidence in their releases, allowing them to implement changes with a clear understanding of their impact. This improved overall productivity and morale.
In the future, further refinements in test coverage and framework optimization could enhance efficiency even more. However, at this stage, our focus on stabilization—guided by scenario-based development—proved to be the right step toward building a stronger and more resilient development process.