The Ultimate Guide to Integration Testing

When the user checksout a book then it should reflect in the Account of the end user and also in the inventory of the Library. Is a highly sought-after integration testing tool by software testers. It is the most suitable for the unit testing of embedded software and helps analyze and identify the code coverage for any software. Furthermore, its CTE helps define diverse test cases through a systematic approach. Is one of the top integration testing tools that help achieve the best possible software quality.

  • The smaller the unit, the more granular insights unit testing can reveal.
  • I have read this every that SIT is performed after system testing.
  • System Integration testing tests the interaction between 2 different systems.
  • The information entered on Screens 1 and 2 is saved in the database.
  • Generally, two or more than two modules are added and tested to determine the correctness of functions.

In the Incremental Approach, modules are added in ascending order one by one or according to need. Generally, two or more than two modules are added and tested to determine the correctness of functions. The process continues until the successful testing of all the modules. Prioritizing is essential, and we should perform it at all the phases, which means we will open the application and select which feature needs to be tested first. Then go to that feature and choose which component must be tested first. Go to those components and determine what values to be entered first.

What Is System Integration Testing?

It involves testing the functional and non functional requirements. This testing is done before the system is handed over to the user for acceptance testing. It is tested for all possible inputs in order to get the desired output. To do this testing one need not have the internal knowledge of code, design of the system.

definition of system integration testing

It’s all about testing the user interface first, and then one keeps moving downward while integrating the lower layers. Let’s look at the different approaches for performing SIT, let’s understand this one by one. The defects found during SIT are sent back to be fixed by the development team. This helps in saving time and the cost of getting it fixed at a later stage, which can be more expensive. Unit testing is considered, by many teams, an unneeded addition to a tester’s busy working routine. Since it takes a while to unit-test the entire system, it’s common for tech project managers to skip the stage altogether.

Advantages of Integration Testing in Software Development

The main objective of these tools is to make sure that the specific modules are working as per the customer’s needs. Since knowing who is responsible for system integration testing is important, it is worth considering the testing practices that change with time. Organizations rely more on quality engineering than quality assurance; the entire team plays a vital role in software quality.

However, this issue can be resolved by using incremental integration. Moreover, top-down integration and bottom-up integration can also be used. As for the test cases, they are defined with the help of high-level software prerequisites. Some developers also integrate the software into the host environment.

Determine which testing strategy you want to use

First, data exchange occurs across system components, followed by an examination of the behavior of each data field inside the particular layer. Intra-System Testing − This is a low-level integration test that wants to connect the modules to produce a unified system. As a result, SIT is essential for exposing and correcting errors before deploying the system to users. SIT discovers problems at an early stage, saving time and money on later repairs.

definition of system integration testing

By making a common repository available to all SIT participants, all teams are able to see up-to-date information. Individual issues can be seen within the context of other issues­ — which are visible across teams and easy to reassign for investigation and resolution. Poorly written or vague test cases won’t help you validate system requirements.

Integration testing

Among those important tests, we can mention the system testing and the integration testing which are performed one after the other. While those two tests are intended to ensure the software is working smoothly without bugs and defects there are some differences that we detailed in this article. The system testing is executed mostly by test engineers and only after the integration testing is done. In system testing, there is no need for internal code knowledge because it includes black-box testing techniques only. This particular testing can be categorized into functional testing and non-functional testing .

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Moreover, in-depth test suites and test cases are built according to the source code. This is an incremental approach, where the testing begins at the topmost module of an application. The functionality of the modules at a lower level is simulated with the help of stubs. The top module system integration testing definition is integrated with the stubs of the modules at the lower levels, one by one to test their functionalities. Once each test is completed, the respective stub is replaced by the real module. During integration testing, both functional and non-functional interface components are validated.


This tool offers several integration testing tool sets that match the compliance standards of different organizations. In addition, Ldra is an open-platform tool that provides code coverage analysis, design reviews, dynamic analysis and static/dynamic analysis, and much more. Unlike the bottom-up method, the top-down approach tests the higher-level modules first, working the way down to the lower-level modules. Developers can use many different accepted software testing techniques in integration testing. Here’s a collection of some of the common techniques available from the field of software testing.

definition of system integration testing

The aim of integration testing is to test the interfaces between the modules and expose any defects that may arise when these components are integrated and need to interact with each other. The text states that “…may be done after system testing.”, i think it depends your methodology and/or project. You can used stubs and drivers to simulate SIT after unit testing. But from my opinion we need first to assure that are code/system is good before interfacing it with other systems. Confirmation tests at this level will identify environment-specific problems, such as errors in memory allocation and de-allocation. The practicality of conducting software integration in the host environment will depend on how much target specific functionality is there.

Data Integrity:

For example at system level we are working on 3 components which are inter dependent. Afterwards when we integrate those 3 components into one module, we again do testing in order to check that module is working as per after integration of all 3 components. That means there is no functional dependency with respect to data or anything. Low-level modules are combined into clusters that perform a specific software sub-function. In this approach processing required for the modules subordinate to a given level is always available and the need for the stubs is eliminated. Bottom-up integration begins construction and testing with modules at the lowest level in the program structure.

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