Aug 10, 2022

The Complete Guide to What is Integration Testing and Why You Need to Know

Integration testing is one of the most important types of software testing.

The Complete Guide to What is Integration Testing and Why You Need to Know

What is Integration Testing?

Integration testing is one of the most important types of software testing. It is a type of software testing that ensures that newly developed code does not break the existing code. It tests the interfaces between components, or modules, to make sure that they integrate well with each other.

The Importance of Integration Testing

The importance of integration testing can be seen in a number of different ways, including:

Preventing production errors in code

Errors in code can be difficult to track down and fix, especially when the error is not always readily apparent. Errors in code can lead to security breaches, data loss, and other costly issues that are avoidable.

Ensuring that there are no bugs in the code

Bugs can be frustrating and at times, expensive. In order to prevent bugs, it is important to have a thorough understanding of the code. One of the best ways to learn the code is by having an expert walk you through it. Sometimes however, this can be too time consuming and not cost efficient. In this case it is important to ask whether or not there will be enough time for your project needs

What are the different types of integration tests?

There are many types of integration testing: black box test, white box test, top-down, big bang and bottom-up. This article will provide a high-level overview of the three types of integration testing: top-down, big bang, and bottom up.

Black box integration tests are conducted without any knowledge about how the program was designed or coded and are usually performed by testers who have never seen the product before

White box integration tests are performed with knowledge about how a program was designed and coded, and usually done by developers who have intimate knowledge of a product's architecture.

Top-down testing is the most common type of integration testing. It is a top-to-bottom process that starts with the highest level module or API and works its way down to the lowest level. This type of testing can also be called "white box" or "black box" testing because it can be used for both white box (source code) and black box (binary) software products. Bottom up integration testing starts with the lowest level module or API and works its way up to the highest level. This type of testing is often used in conjunction with top-down integration tests to identify any low-level problems that may have been missed during top-down testing.

Big bang integration testing Finally, there is the big bang strategy. All modules are simultaneously tested using this method. Naturally, this calls for the completion of each module. As a result, this method might be highly time-consuming. In addition, compared to the other methods, error detection may be a little trickier. The big bang strategy, however, might be a terrific option if your application is modest.

Tools for integration testing

The process of examining the interaction between two software modules or components is known as integration testing. It focuses on detecting if the interface is proper. It is used to discover issues with the way integrated components interact. The process of examining the interaction between two software modules or components is known as integration testing. Here are a few tools for integration testing:




Validada MSG



A logical integration tester


VectorCAST/Ada MSG

Let's begin by going into depth about each of these instruments.

1. Citrus

Citrus is a test framework written in java. It checks for JSON, XML, and plain text in the request and return data. Think about the scenario where the application server is hosting the test application. Among other message transports, this application connects with Citrus through SOAP, HTTP, and JMS. Citrus mimics the request and returns messages by taking on the roles of both a client and a server.

Key characteristics:

It is open-source software that is available for free under the Apache License 2.0.

The order in which messages are transmitted must be exact.

Create erroneous messages.

Checking Message Headers

Sending and receiving messages

Send a message first, then wait for a response.

The returned XML is verified.

 Make sure the information is real.2. 

2. VectorCAST/C++

A well-liked unit and integration testing tool is VectorCAST from Vector Software. To make sure that individual components are functioning as intended and are independent of one another, each unit or module is tested independently. To make sure that all connected modules are functioning correctly as a whole, these components are later united during integration testing. According to Vector's tools, unit tests are carried out as distinct components, while integration tests are a set of unit tests that are merged into a logical module and then done as a whole.

Key characteristics:

The VectorCAST/C++ tool is used by programmers who design embedded software in the C or C++ programming languages.

It is used to speed up the testing process and automate unit and integration testing.

A capable unit and integration testing solution is VectorCAST/C++.

It accredits embedded systems that are crucial for business and safe.

The solution provided by VectorCAST/test C++ is extensively used in the financial sector as well as in industrial controllers, medical equipment, and railroads.


LDRA has dominated the market for software quality tools for more than 40 years. Code analysis for mission-critical applications is automated by these packages. Tools for integration testing that are used to confirm compliance with standards are offered by LDRA. LDRA is an open platform that enables both static and dynamic analysis across many platforms and the creation of integration tests using the LDRA tool set.

The integration tools provided by LDRA include TBrun, which enables automated unit and integration testing.

A standalone program called LDRAunit offers a fully integrated environment for unit testing.

Key characteristics:

With the use of tools, unit and integration tests may be easily designed and carried out.

The tool helps by offering a range of assistance so that unit and integration testing may be done across several projects in a single setting.

The tool may be customized to a team's requirements while still being reasonably priced.

4. A logical integration tester

Prior to being bought by IBM, it was known as a "Green Hat," but IBM changed its name to "rational integration tester." It offers a script-free environment for developing and testing SOA messaging applications and business process integration initiatives. It is a piece of a workbench for logical tests. Clients may test apps early in the development process thanks to this solution's affordable test environments. Using this technology, one may prevent integration problems by using an agile and iterative development method.

Key characteristics:

Users can perform functional, regression, and integration testing.

Code and reusable stubs are created if certain modules are missing yet testing must continue.

By exporting and importing data from the rational integration tester to the rational test control panel, it will make recording easier.

Then, in order to remove the need for test requirements, one might design virtual services based on the requirements.

It is used for continuous integration throughout the software development life cycle.

5. FitNesse

It is a standalone solution that is completely integrated and great for dealing with business stakeholders. The coding for FitNesse is an open-source project, and neither the business nor any one person owns it. FitNesse is an open-source technology, therefore the FitNesse community has contributed a lot of information.FitNesse was originally used to determine if the system satisfied the demands of the company. It verifies that the program satisfies the user's requirements. An open-source project's source code is not owned by any one entity. On the other hand, the FitNesse community provided details on this test-taking device.

It is a free and open-source workout program, among other things.

Simply download the Java jar file, and it is immediately used without the need for any installation.

Python, Java, and C# are just a few of the many languages it supports.

It enables you to verify requirements for any software project with real software implementation.


Given that it is used for both integration and unit testing of embedded software, it is an essential tool for integration testing. The whole test organization, including requirements, traceability, test management, and coverage measurement, will fall under its purview. We can determine an application's code coverage with the help of TESSY. We can develop test cases with CTE (classification of tree editor).TDE may also be used to change test results (test data Editor).

The possibility to apply for a floating license is one of its key features.

The TDE (Test Data Editor), workspace, and TIE are the three main components of TESSY (Test Interface Editor).

It is used to define the variables that the function utilizes and evaluate the interface of the function.

TESSY supports the C++ and C programming languages.

Based on the outcomes of the test execution, a test report is generated.

7. Protractor

It is a JavaScript-based open-source end-to-end testing framework designed for AngularJS and Angular apps. This NodeJS tool looks for web components in AngularJS applications. Once the software is running in a real browser, the tests will be performed on our application.

Key characteristics:

Protractor may be used to launch an instance of our application.

It is a device used for integration testing.

It performs the tests from the end-viewpoint. user's

The end-to-end test is written there.

It's a language for creating dynamic web applications.

8. VectorCAST/Ada

VectorCAST/Ada, another significant product from Vector Software, is used by programmers to construct projects in the Ada programming language. Additionally, it provides a unit and integration testing solution that can be automated. These tests are used to validate crucial embedded systems for safety. With VectoCAST/Ada, unit testing may be carried either locally or via a target simulator. Each component or module is constructed, and then a code is produced. Drivers are used to simulate the functionality of the code that is being tested, while stubs are used in the function that the code being tested calls.

Key characteristics:

It may be used in combination with a number of other software programs, such as Green Hills and IBM Rational.

Utilizing pre-existing test cases, regression testing is automated.

The creation of automated test cases uses the decision path approach.

The examination of code complexity may be used to locate high-risk code.

9. Validada MSG

An automated testing system called Validata Message Testing (MSG) is used to test SWIFT, SOA, ATM, and generic interfaces. The integration testing step is made simpler and faster using Validata MSG. Using Validata MSG, end-to-end scenarios may be designed and validated at several levels. Additionally, it was utilized to guarantee both the sending and receiving behavior of the application and the substance of the data.

Key characteristics:

Validata MSG simulates actual business situations.

Due to the scenarios' reusability, it is affordable and compatible with HP ALM.

Reusability can increase testing productivity and efficiency significantly.

Reusability helps keep overall expenses down.

Conclusion : Integration Testing and Why You Need to Know

The conclusion is to say that integration testing is important for developers and testers alike. It is also important for software developers to make sure that they are not just testing their own code, but also other parts of the system. This will help ensure that bugs are found early in the process, before they get released into production.