Mockito vs TestNG: What are the differences?

Introduction

In this article, we will discuss the key differences between Mockito and TestNG.

1. Mockito: Comprehensive mocking framework

Mockito is a powerful mocking framework used for creating and configuring mock objects. It allows developers to simulate the behavior of an object during testing. Mockito provides various methods and annotations to create and manipulate mock objects, making it easier to write unit tests.

2. TestNG: Testing framework with advanced features

TestNG is a testing framework designed to simplify the testing process and provide advanced features for test execution. It supports different types of tests such as unit, functional, and integration tests. TestNG offers features like parallel test execution, data-driven testing, and test configuration through XML files.

3. Mockito: Focuses on mocking behavior

Mockito primarily focuses on mocking the behavior of objects. It allows developers to define the expected behavior of a mock object and specify the return values for different method calls. Mockito also provides methods to verify if certain method calls were made on the mock object during the test.

4. TestNG: Provides a complete testing solution

TestNG provides a complete testing solution with features beyond mocking. It supports test configuration, grouping and sequencing of tests, test dependency management, and test annotation support. TestNG also has built-in reporting capabilities, making it easier to analyze test results.

5. Mockito: Emphasis on isolated unit tests

Mockito is mainly used for creating isolated unit tests where the focus is on testing a single unit of code in isolation. It allows developers to mock dependencies and simulate their behavior, ensuring that the unit under test is isolated from external dependencies.

6. TestNG: Supports multiple test levels

TestNG supports multiple test levels, including unit tests, integration tests, and functional tests. It provides a flexible and extensible framework to handle different test scenarios. TestNG allows developers to define test groups, specify test dependencies, and organize tests based on their priority and groups.

In summary, Mockito is a mocking framework that focuses on mocking the behavior of objects, whereas TestNG is a comprehensive testing framework with advanced features beyond mocking. Mockito is mainly used for isolated unit tests, while TestNG supports multiple test levels and provides a complete testing solution.