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Mockito

Mockito allows lighter (and thus faster) unit and integration testing while avoiding some challenges when creating many POJOs interacting with each other in a test environment

Types of Mocks

• Dummy - object used just to get the code to compile
• Fake - object that has an implementation, but is not production ready
• Stub - object with pre-defined answers to method calls
• Mock - object with pre-defined answers to method calls, and has expectations of executions. Can throw an exception if an unexpected invocation is detected
• Spy - a "spy" is a Mock-like wrapper around an actual object which allows you to intercept calls to the object, inspect things or pass things directly along to the underlying object

Mockito Terminology

• Verify - used to verify number of times a mocked method has been called - if twice, then not 1 time, not 3 times, provides precision and method control
• Argument Matcher - Matches arguments passed to a Mocked Method and will allow or disallow
• Argument Captor - Captures arguments passed to a Mocked Method
  • Allows you to perform assertions of what was passed in to the method

Mockito Annotations

• @Mock - used to create a mock
• @Spy - used to create a spy
• @InjectMocks - injects mocks/spys into a class under test
• @Captor - captures arguments to a mock

Mockito Maven dependencies

• org.mockito - mockito-core
• org.mockito - mockito-junit-jupiter
• both ver 2.23.0+
• scope - test

Introduction to JUnit 5 with Maven

All source code examples in the repository are for my Online Course - Testing Spring Beginner to Guru

This source code repository contains JUnit 5 test examples with Maven.

Setup

Requirements

• Should use Java 11 or higher. Previous versions of Java are un-tested.
• Use Maven 3.5.2 or higher

Support

For questions and help:

• Please post in course
• Or post in the Slack Community exclusive to the course.

GitHub Issues will not be addressed.