Creating the Balance Between End-to-End and Unit Testing

Cover Image for Creating the Balance Between End-to-End and Unit Testing
Animesh Pathak
Table of Contents

In the dynamic landscape of software development, the approach to testing has evolved significantly. One of the debates that often surfaces is the choice between end-to-end (E2E) testing and unit testing, particularly when it comes to testing in a live production environment. In this blog, we'll explore the rationale behind Testing in Production and why striking a balance between E2E and unit testing is crucial for ensuring robust software applications.

Understanding Testing in Production

Testing in Production is a paradigm shift that recognizes the need to validate the behaviour of software in a real-world environment. Traditional testing methodologies, such as unit testing in isolation or staging environments, may not capture all the nuances and interactions that occur in the actual production setting.

  1. Real-world Scenarios: Testing in Production allows developers and testers to observe how the software behaves under real-world conditions. It provides insights into performance, scalability, and interactions with other services or components that might not be accurately simulated in controlled testing environments.

  2. Incremental Deployment: With modern deployment practices like continuous delivery and continuous deployment, software changes are rolled out incrementally. Testing in Production supports these practices by validating each incremental change in the live environment, reducing the risk of unforeseen issues when deploying larger updates.

The Role of End-to-End Testing

End-to-End testing involves validating the entire application workflow, from the user interface to the backend. While unit testing focuses on isolated components, E2E testing ensures that the entire system functions seamlessly.

  1. User-Centric Validation: E2E testing is user-centric, simulating user interactions and scenarios. This ensures that the software meets user expectations and behaves as intended from a user's perspective.

  2. Integration Testing: E2E testing inherently includes integration testing, verifying that different components of the system work together seamlessly. This is crucial for identifying issues that may arise when various modules interact.

Creating the Balance in-between

  1. Comprehensive Coverage: While unit testing is essential for verifying the correctness of individual components, E2E testing complements it by providing a holistic view of the application. Striking a balance ensures comprehensive test coverage.

  2. Early Detection of Issues: Unit testing catches issues at the code level, allowing for early detection and resolution. E2E testing, on the other hand, identifies problems in the overall system, helping to catch integration issues and unexpected interactions.

  3. Efficient Debugging: When issues arise, a combination of unit and E2E tests simplifies the debugging process. Developers can quickly pinpoint whether an issue lies within a specific component or if it is a result of interactions between components.


In the ever-evolving world of software testing, Testing in Production emerges as a crucial practice for ensuring the robustness of applications. By embracing a balanced approach that incorporates both E2E and unit testing, developers and testers can create resilient software that meets user expectations while minimizing the risk of defects in production. Striking this balance empowers development teams to deliver high-quality software in an agile and user-focused manner.


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