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How to approach Integration Testing?

woodjessica profile image Jessica Wood ・3 min read

Software applications have become an integral part of every organization. But before these applications are released in the market, these software apps are thoroughly tested. Software testing has various levels and integration testing is an initial level after unit testing which is very important. Let us now try to understand this testing type in more detail.

What is integration testing?

It is a software testing method in which individually tested/unit tested software modules/units/components of the software are combined to ensure that these modules work fine with each other after combining. The main aim of this test is to verify data communication among different modules and it also validates the performance, functionality, and reliability of the software product.

Why should integration testing be taken up?

This test helps to validate the performance, functionality, reliability of integrated modules
It enhances the code coverage and improves the reliability of the tests
Identifies system-level issues and helps to resolve them at the earliest
Helps to identify and resolve issues in the early stage of the software development process
Ensure that the modules interact with other APIs and third-party tools as expected
Allows teams to understand the logic implemented by the developer against the requirements

How to approach integration testing?

Below mentioned are different approaches that can be followed to perform this test:

Big bang approach– In this approach, almost all of the units or major units are combined and tested in one-go.

Incremental testing approach – This approach includes testing a minimum of two related modules. The modules are summed up testing and achieve proper functioning

Top-down approach –This testing approach includes testing of top unit levels first and then moving to lower unit levels

Bottom-up approach– This testing approach includes testing of lower unit levels first and then moving to upper levels

Hybrid approach - It is the combination of the top-down and bottom-up approach
What are the steps involved in integration testing?

Below mentioned are the steps involved in performing this test:

Prepare the test plan: Before starting the test the teams need to prepare a test plan and test strategy. This helps the testing teams to maintain the test flow. Simultaneously, developers should identify and document the test cases and test data.

Identify modules to be tested first: In this step, it is essential to study the architectural design of an application. This helps to determine the critical modules that need to be tested on high priority.

Examine the interface: It is very essential to examine the interface while designing the test cases and test scenarios. It is very important to reconcile interfaces, i.e.

When modules transfer data to each other, there should be a clear indication that data has been transferred. If it does not happens, this defect should be fixed here itself before moving further.

Prepare the test conditions: To proceed with the testing for each unit of the software, test conditions should be prepared and documented.

Select the test automation tool and run the test: After preparing the test scripts and test conditions, an automation tool has to be selected. Once the automation tool for conducting the test is decided, the test should be executed.

Track the defects, record, and save the results: Once the test is completed, check the defects, if there are any defects report them for re-testing, and save the results for further reference.

Retest to validate the completeness of the test: For the test cases that reported defects, perform re-testing. This step has to be repeated until the testing process is complete and all the conditions are fulfilled. The whole process should be recorded and the final result should be saved for reference.

Conclusion: Today every enterprise wants quality apps and websites; therefore before the release of the software, enterprises ensure that these apps are effectively tested.

Integration testing is one such software testing practice that helps to ensure that software modules are properly integrated and work as expected. Leverage integration testing from a next-gen QA and software testing services provider to get high-quality software.

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