Integration testing is an often overlooked yet critically important part of the software testing process. Many developers see it as a “boring” phase compared to writing new code or testing individual components. However, neglecting integration testing can set your project up for major issues further down the road. When components that were developed and tested separately need to communicate and work as one cohesive system, unexpected bugs can lurk beneath the surface. These types of issues are tough to find through isolated testing alone. Read on to find out why thorough integration testing is worth the investment.

1. Find Defects Early

One of the biggest values of integration testing is finding defects early in the development cycle. When individual software modules or components work properly in isolation but fail when integrated, some underlying issues need addressing. The sooner these problems are identified, the faster they can be fixed. Fixing defects becomes much more expensive as they are detected later in software development. Integration testing finds issues before too much additional work has been put into building on a shaky foundation.

1. Verify Component Interoperability

Modern software applications are modular, with different components working together collaboratively. This includes third-party APIs, web services, software libraries, modules within a system, etc. Even if the individual components have been thoroughly unit tested, there are still risks in the connections between them. The purpose of integration testing is to assess these touchpoints among components to make sure interoperability works as expected. Identifying problems with interoperability early prevents significant headaches down the road.

1. Assess Performance

Integration testing provides an environment to assess the performance of an application. Relying solely on unit testing for this is insufficient because it lacks similar system connectivity and configurations. As key components connect through integration testing activities, testers can better gauge impacts on memory usage, response times, load capacity, and overall stability. If there are performance problems, they can be addressed proactively before launch.

1. Final Validation Before Release

While more testing at other test levels will still occur after integration testing, integration testing provides pivotal validation right before release to production environments. It essentially sets the foundation for acceptance, user interface testing, system testing, etc. At this stage, the software or system being developed should align closely with final expectations, even if more work remains. If integration testing is skipped or rushed, major risks are taken, advancing to subsequent test levels.

1. Prevent Costly Re-Work

Given that a key objective of integration testing is finding defects early, it naturally helps prevent expensive re-work often caused by defects detected later in the test life cycle or after entering production. The costs of re-work grow exponentially more expensive over time as more functionality and business logic build on top of unstable solutions or components. Fixing integration issues early rather than late ultimately saves significant time, resources, re-development, and overall costs. Preventing re-work is one of the most compelling reasons to fully invest in integration testing practices.

Conclusion

Integration of testing automation platforms plays a vital role in building stable software applications and systems, not fully embracing it in testing methodologies. Opkey is a no-code automated testing solution that will liberate your team from these constraints. With Opkey, you can create fully automated tests across all your applications and technologies with no coding required. Just point. Click. Test. Opkey supports over 15 apps and 150 technologies out of the box, so you’ll be testing everything in no time.