Complete Guide To Java Testing with JUnit 5 & Mockito

Course details

In this comprehensive course, software developer Kathryn Hodge covers critical aspects of software testing in Java development. Learn about writing Java tests with JUnit 5, AssertJ, and Mockito frameworks. Find out how to write automated tests with assertions, explore the test lifecycle, use rich assertion sets with detailed failure messages, mock objects, stub methods, and verify interactions. Dive into testing Spring Boot applications, including repositories, services, controllers, integration testing, and mocking external dependencies. By the end of this course, you'll gain a solid understanding of testing methodologies and tools to ensure the quality and reliability of your Java applications.

Learning objectives
Master software testing techniques and methodologies to build high-quality, reliable Java applications.
Gain proficiency in using popular Java testing frameworks like JUnit 5, AssertJ, and Mockito for writing automated tests, assertions, mocking objects, and verifying interactions.
Develop skills to thoroughly test Spring Boot applications by learning to test repositories, services, controllers, handle integration testing, and mock external dependencies.

Concepts

0. Introduction

01 - Why is testing important
02 - What you should know
03 - How to use Codespaces
04 - Manage dependencies with Maven

1. Introduction to Software Testing

05 - Key concepts in software testing
06 - Using test cases to verify software
07 - Types of software testing
08 - Automated vs. manual testing
09 - What is a testing framework
10 - Java testing frameworks
11 - Understand test-driven development (TDD)
12 - Ensure quality with test coverage
13 - Write effective tests with F.I.R.S.T. testing principles

2. Getting Started with JUnit 5

14 - Set up JUnit 5 in your Java application
15 - Write and run your first JUnit 5 test
16 - Assertions in JUnit 5
17 - JUnit 5 test lifecycle
18 - JUnit 5 lifecycle hooks
19 - Testing exceptions in JUnit 5
20 - Debug tests in JUnit 5
21 - Best practices for writing tests in JUnit 5
22 - Challenge - Write a JUnit 5 test for a temperature converter
23 - Solution - Write a JUnit 5 Test for a Temperature Converter

3. Build an Application Using Test Driven Development with JUnit 5 Tests

24 - Task manager project prompt
25 - Set up red phase for Add Task functionality in Test Class
26 - Implement Get ID in Task Class
27 - Implement Add Task and enter green phase
28 - Prevent tasks with duplicate IDs
29 - Implement Remove Task with Test Driven Development
30 - Implement task descriptions with Test Driven Development
31 - Implement Update Description with Test Driven Development
32 - Implement Retrieve Task with Test Driven Development
33 - Refactor tests to ensure maintainability

4. Advanced Testing Techniques with JUnit 5

34 - Introduction to parameterized tests in JUnit
35 - Parameterized tests with EnumSource in JUnit 5
36 - Parameterized tests with ValueSource in JUnit 5
37 - Parameterized tests with CsvSource in JUnit 5
38 - Conditional test execution based on Java version and OS
39 - Conditional test execution based on environment variables
40 - Conditional test execution based on custom conditions
41 - Control test execution with @Order
42 - Create test suites in JUnit 5
43 - Create a test coverage report with JaCoCo
44 - Ensure test coverage with JaCoCo
45 - Execute parallel tests in JUnit 5
46 - Custom extensions in JUnit 5
47 - Challenge - Write a test class for a email validator
48 - Solution - Write a test class for a email validator

5. More New Annotations with JUnit 5

49 - Add a display name to your tests
50 - Nested tests
51 - Timeout
52 - AssertTimeout
53 - AssertAll
54 - Message suppliers
55 - Assumptions API
56 - TempDir
57 - Migrate from JUnit 4 to JUnit 5
58 - Challenge - Sorting algorithm validation
59 - Solution - Sorting algorithm validation

6. Getting Started with Mockito

60 - Set up Mockito
61 - Mocking basics
62 - How to mock an object in Java
63 - Stub a method with Mockito
64 - Verify an interaction with Mockito
65 - Verify arguments with argument matchers
66 - Verify arguments with argument captors
67 - Challenge - Test a library management system
68 - Solution - Test a library management system

7. Advanced Mockito Techniques

69 - Spy on real objects with Mockito
70 - Test exception handling with Mockito
71 - Test void methods with Mockito
72 - Verify no (or a set number of) interactions
73 - GetAllValues with ArgumentCaptor
74 - Test asynchronous code with Mockito
75 - Mock a static method with Mockito
76 - Challenge - Test an ordering service
77 - Solution - Test an ordering service

8. Testing Spring Applications with JUnit 5 and Mockito

78 - Walk through a basic Spring Boot application
79 - Write your first Spring Boot test
80 - Test Spring data repositories
81 - Test Spring services
82 - Test Spring controllers
83 - Integration testing with Spring Boot
84 - Best practices and tips for testing Spring Applications
85 - Challenge - Test a Spring weather application
86 - Solution - Test a Spring weather application

Conclusion

87 - Reflect on testing in Java - Key takeaways and insights