Mockito Framework Tutorial
The Mockito tutorial provides basic and advanced concepts of the Mockito framework. Our Mockito tutorial is designed for both beginners and professionals. It will help you to learn and create unit tests using the Mockito framework.
Mockito is a mocking framework. It is a Java-based library used to create simple and basic test APIs for performing unit testing of Java applications. It can also be used with other frameworks such as JUnit and TestNG.
What is Unit testing?
Unit testing is a software testing technique in which individual components/parts of the software is tested, i.e., a group of computer programs, usage procedure, etc. Unit testing of an object is done during the development of an application or project. The aim of unit testing is to isolate a segment of code (unit) and verifies its correctness. A unit is referred to as an individual function or procedure (program). The developers usually perform it during testing.
What is Mocking?
Mocking is a process of developing the objects that act as the mock or clone of the real objects. In other words, mocking is a testing technique where mock objects are used instead of real objects for testing purposes. Mock objects provide a specific (dummy) output for a particular (dummy) input passed to it.
The mocking technique is not only used in Java but also used in any object-oriented programming language. There are many frameworks available in Java for mocking, but Mockito is the most popular framework among them.
To mock objects, you need to understand the three key concepts of mocking, i.e., stub, fake, and mock. Some of the unit tests involve only stubs, whereas some involve fake and mocks.
The brief description of the mocking concepts is given below:
Need for mocking
Before using the Mocking technique, we should know the reasons for using mocking, which are as follows:
What is Mockito?
Mockito is a Java-based mocking framework used for unit testing of Java application. Mockito plays a crucial role in developing testable applications. Mockito was released as an open-source testing framework under the MIT (Massachusetts Institute of Technology) License. It internally uses the Java Reflection API to generate mock objects for a specific interface. Mock objects are referred to as the dummy or proxy objects used for actual implementations.
The main purpose of using the Mockito framework is to simplify the development of a test by mocking external dependencies and use them in the test code. As a result, it provides a simpler test code that is easier to read, understand, and modify. We can also use Mockito with other testing frameworks like JUnit and TestNG.
The Mockito framework was developed by upgrading the syntax and functionalities of
EasyMock framework. It was developed by a team of developers consisting of Szczepan Faber, Brice Dutheil, Rafael Winterhalter, Tim van der Lippe, and others. The stable or latest version of Mockito is version 3.0.6 was released in August 2019.
Benefits of Mockito
Below are given some benefits of the Mockito framework:
Before learning the concepts of the Mockito framework, you should have hands-on experience in Java programming and some basic understanding of the JUnit framework.
Our Mockito Tutorial is designed to help beginners and professionals.
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