What are the common types and levels of integration testing and how do you choose the appropriate ones?

1 Types of integration testing

Integration testing focuses on different aspects of system integration, and there are several types. Big bang integration testing involves testing the entire system as a whole after all components or modules are integrated. It is usually done at the end of the development cycle but can be risky and difficult to isolate and fix errors. Incremental integration testing involves testing the system gradually as new components or modules are added, either top-down or bottom-up. Sandwich integration testing combines both top-down and bottom-up approaches, but it can be challenging to plan and execute. Each type of integration testing has its own advantages and disadvantages, so it is important to consider which one to use based on the complexity and risk of the system.

3 How to choose the appropriate types and levels of integration testing

Integration testing is an essential part of software quality assurance that can help deliver a system or solution that works well and satisfies end users. Choosing the right types and levels of integration testing is key to improving efficiency, effectiveness, and confidence. Factors to consider when selecting the types and levels of integration testing include the size, complexity, and architecture of the system or solution; availability, quality, and compatibility of components; time, budget, and resources; risks, dependencies, and constraints; and standards, guidelines, and best practices. To choose the appropriate types and levels of integration testing, analyze the system or solution to identify components, modules, subsystems, systems, or applications and their interfaces; define objectives, scope, strategy, plan, and criteria; select the types and levels that suit these objectives; execute according to the plan; evaluate results and outcomes; and take corrective action if needed.

4 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?