What is Integration Testing in Software Testing

Why testing is necessary

The process of product validation is called testing. The client can decide if the software is ready to use or should be modified based on the results of testing. Testing is done to determine if the software features are as expected and required.

To reduce the number of low-quality applications and software on the web, testing is essential.

Testing is performed to ensure the quality of the product. This is just one side. The business must first test their products. When a company introduces a product to the market that is insecure, unstable, or difficult to use, the cost of fixing those bugs can quickly become significant. Bugs discovered by users while using the software are more costly than those found during testing.

Testing can save money and time. You can fix most problems without having to break the entire system.

Software testing comes in many forms, each with its own features and applications. Software testing is used to test the functionality, performance, security, usability of software in artificially-created situations. The rules for creating artificially created situations will vary depending on the type of testing.

This article will discuss everything related to Integration Testing.

Integration Testing and Its Strategy

We’ve mentioned that there are many types of testing and that they must be performed in a certain order. Integration testing is a intermediate stage between system and unit testing.

Integration testing is the process of examining the interdependence between modules and systems. Software products often consist of multiple software modules that were written by different coders. Software modules can interact with each other and exchange data, which can lead to faults. Integration testing is also known by the names “I & T”, “line testing” and “thread testing.”

There are many ways to apply integration testing.

Big Bang Method

This method is designed to test all components together. This method is quick and easy if the system is small. It is difficult to locate errors if the system is complex. If there are too many elements, testers can skip them. High-risk modules that are critical and high-risk are all tested simultaneously. They are therefore not isolated and are ranked in priority order. Peripheral modules that deal with user interfaces are not tested separately and prioritized.

The Big Bang approach to software testing is a potentially risky and fast method.

Bottom-up method

You test each module at a lower level with modules at higher levels until you have tested all of them. After the lower-order modules have been thoroughly tested, top-ranked modules can’t be integrated into software. QA testers may use a Driver to connect the lower-order and higher-order modules in a bottom-up method. It is possible to fix a module that stops working immediately. This allows for faster development and less time than the Big Bang approach. This methodology has the disadvantage of not being able to quickly implement a prototype.

Top down method

This method involves testing according to the software system’s control flow. It is named in the reverse order of the previous method. The top modules must be tested first before you can test the lower modules. This method is similar to the bottom-up approach. It involves invoking a specific logical operator with short program codes. This code is used to receive input from lower modules via the upper modules during system integration testing. This operator is called a Stub by testers. Tests are conducted in an aggregate of all the modules, with the lowest-level modules being tested first.

The Top-down approach makes it simple to spot bugs in the system by checking all modules independently of minor modules.


This method of testing is also known as the “sandwich”. Testers use a combination of top-down and bottom-up methods to test. This strategy employs both drivers and stubs. This strategy is great for large projects that will require a lot of work.

Why you need integration testing

Integration testing may be required for the following reasons:

Each programmer may have a different understanding of the logic behind each module.

Modifications by the customer can occur during module development and may interfere with system integration.

Software modules’ interfaces may have errors.

Hardware interface errors may exist.

Incorrect exception handling.

If a team works on a project that has changing customer requirements and requires constant adjustments to the code structure or logic, integration testing is essential.

Integration Testing Benefits

There are many benefits to integration testing over other methods. Integration testing, for example, allows multiple software components to be integrated (in integration). Thanks to the above techniques, the system under test can cover a wider range of components in one sprint.

Simultaneous testing different modules simultaneously saves time, money and effort.

Integration testing can be done at any stage in software development or testing. This type of testing is also flexible enough to be used in large or small projects that have a different focus.

You can use integration testing to determine the relevance of modules and their compliance with requirements. You can test the most relevant breaks by focusing on user scenarios: data model, business logic, and boundary situations.

Customers can maximize the commercial value and ease of use of integration testing by simply using it every day.

Software testing is an essential part of software development. Testing can be done manually or automatically. Early implementation will prevent critical bugs from appearing and prevent interacting bugs from becoming a problem. The testing prevents problems from getting into production and saves money and reputation.

About the author:

Robyn McBride, a journalist and tech critic, is the author of articles on software, AI, and design. She is particularly interested in digital trends, modern image processing and digital technologies. Robyn is also a proofreader for Computools.

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