Integration Testing: What is, Types with Example

This data exchange process should keep both systems up-to-date. The purpose of system integration testing is to ensure all parts of these systems successfully co-exist and exchange data where necessary. When all the modules are combined as a whole, many errors and facts may arise which may not give the expected results? So system testing is performed to find the defects or bugs in all the interfaces as well the whole system.

definition of system integration testing

Then a driver is created to manage the input and output details related to the test case. Let us understand system integration testing using a real-world scenario. Assume that a product-based organization uses software to manage different customer details, storing customer information in dedicated databases.

Native Mobile App Testing

The team should create a test plan to determine the type of test and the desired results. Strong technical and communication skills for effective stakeholder management. The top-down and bottom-up approaches discussed in the previous sections are used in combination here. The system is categorized into three different layers – the middle layer is the target layer, one layer is above the target, and there is another layer below the target.

definition of system integration testing

In conjunction with the lower-level modules and vice versa. Once the module development is finished, they are integrated and tested together in one go. Due to the sheer volume of this type of testing, it is generally system integration testing definition suitable for testing compact applications. From rapid prototyping to iterative development, we help you validate your idea and make it a reality. For the test cases that reported defects, perform re-testing.


In this approach, almost all of the units or major units are combined together to perform integration testing in one attempt. Usually, this method is practised when teams have entire software in their bundle. In big-bang testing, most of the developed modules are coupled together to form a complete software system or major part of the system and then used for integration testing. This method is very effective for saving time in the integration testing process. Mobile-device testing assures the quality of mobile devices, like mobile phones, PDAs, etc. The testing will be conducted on both hardware and software.

System integration testing involves the overall testing of a complete system of many subsystem components or elements. The system under test may be composed of hardware, or software, or hardware with embedded software, or hardware/software with human-in-the-loop testing. Large software developments will divide software integration into a number of levels. The lower levels of software integration could be based predominantly in the host environment,with later levels of software integration becoming more dependent on the target environment.

Big Bang Testing

We also covered Example to differentiate between System testing and Integration Testing. Checking the payment page and the transaction id generated. Checking the shopping cart page, if all the data coming from the product detail page is proper. Searching a product using search bar, checking if the search bar accepts space, characters. Unit tests are able to test all logic within your process boundary, and they can do it easily precisely because of the lack of dependencies on the slow/fragile/complex “external world”. There exists a contract of sorts between your process and the external world, and minimally verifying that contract should be the goal of an integration test.

  • Metrics, including user error rates, task success rates, the time it takes a user to complete a task and user satisfaction, are used during testing.
  • Testing the integration of systems and software packages, testing communication interfaces with external systems (Internet, etc.).
  • Create a data map from database fields to application fields and check whether necessary fields are visible in UI.
  • You must have basic knowledge of certain schema technologies for performing SIT at this layer.
  • If a software build achieves the desired results in system testing, it gets a final check via acceptance testing before it goes to production, where users consume the software.
  • In this testing approach, a minimum of two modules that are logically related is tested.

This really is a narrower view compared to what KeesDijk described earlier, however I suppose the projects I worked on till now were small enough to let me this level of simplification. In a client/supplier relationship it can be a contractual responsibility . I personally like to think of an integration test as of a feature test when every component of the system is real, no mock objects. They have more specific kind of tests that can be performed within the above mentioned tests. The other system that needs to be integrated with can either be internal or external .

What are the 5 system integration methods?

LDRA is a cost-effective tool that offers various sets of integration testing tools to match the compliance standards of different organizations. The testing of the application will start from the crucial top-level module. For example, first, the login page will be tested and integrated, and then gradually, other low-level modules will be tested.

Even the peripheral modules are tested equally as compared to high-risk modules. This blog highlights best practices, must-have tools, and captivating real-world examples that inspire innovation in integration testing. Simform pairs human-centric design thinking methodologies with industry-led tech expertise to transform user journeys and create incredible digital experience designs. • LDRAUnit is a standalone tool and assures to provide a fully integrated environment for performing unit testing.

What are the important Integration Testing approaches businesses should know?

Testing is performed in both directions and is grouped in the middle layer. However, there is also a limitation where you can thoroughly test the individual subsystems before integration. Once the cluster is tested, you can remove the driver, and the cluster is combined with the next upper level. This process continues until we have traversed the entire application structure. It takes time to unit test all the modules in a system separately. It is possible that subsystems can fail even if they are tested individually since many issues arise when they interact with one another.

definition of system integration testing

Testsigma also allows users to integrate with bug-tracking systems, so any issues discovered during testing can be tracked and addressed quickly. Also, there will be a high chance of occurrence of the critical bugs in the production environment. Develop stubs that perform limited functions that simulate the actual module. To make sure that new errors have not been introduced Regression Testing may be performed.

Data State when flowing within the Application Layer

However, by applying combinatorial approaches and workflow scenarios, it may be possible to lessen the risk of integration failures. However, let’s also consider the situation where the above scenario also triggers a function in a fourth system . The integration and interoperability wasn’t tested because no one considered system D was even part of the picture. Much of this is due to a lack of documentation or knowledge about where integration occurs in this point-to-point approach. In Figure 5 we see an integration test to validate purchasing a product from an e-commerce web site.