Pragmatic Unit Testing in Java 8 with JUnit

Explore writing unit tests for Java applications using JUnit, delve into JUnit organization, assertions, quality practices, design relevance, refactoring, and using mock objects for dependencies.

Intermediate

102 Lessons

13h

Certificate of Completion

Explore writing unit tests for Java applications using JUnit, delve into JUnit organization, assertions, quality practices, design relevance, refactoring, and using mock objects for dependencies.

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Explanations

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This course includes

91 Playgrounds

26 Quizzes

This course includes

91 Playgrounds

26 Quizzes

Course Overview

In this course, you will learn how to write a unit test for Java applications using JUnit. You'll start by covering unit-testing foundations, which provide you with a starter set of information about writing basic tests in JUnit. You’ll learn about JUnit organization and assertions, and you’ll pick up a few core quality practices for unit testing such as the Right BICEP and the CORRECT way. Towards the end, the bigger design picture focuses on the relevance of design to unit testing and vice versa. You’ll...Show More

What You'll Learn

Learn how to effectively test Java applications using JUnit

Get to know the core quality principles of unit testing

Master writing cleaner and refactored JUnit tests

What You'll Learn

Learn how to effectively test Java applications using JUnit

Course Content

Before We Begin

Get familiar with pragmatic unit testing principles, JUnit practices, and their benefits.

Why This Course?

Course Structure

Why Unit Testing?

JUnit Test Foundations

Get started with foundational JUnit concepts, writing unit tests, and maintaining test clarity.

Reasons to Write Unit Tests

Introduction to Building JUnit Test

Our First Passing Test

Arrange, Act, and Assert Your Way to a Test

Understanding What We’re Testing: The Profile Class

Let's Write Tests

Initializing Tests with @Before Methods

Quiz on JUnit Test Bits

Digging Deeper into JUnit Assertions

Break apart critical JUnit assertions, styles, decorators, floating-point comparisons, and exception handling techniques.

Introduction to Assertions in JUnit

A Classic-Style Assertion: assertTrue

Hamcrest Assertions

Decorators

Comparing Two Floating-Point Numbers

Assertion Messages

Testing the Expected Exceptions

Expected Exceptions using JUnit

Quiz Time

Organizing Your Tests

Break down complex ideas for organizing and optimizing unit tests in JUnit.

Follow the AAA Pattern

Test Behaviors not Methods

Relationship Between Test and Production Code

Focused and Single-purpose Tests

Mastering Manic Mnemonics!

Deepen your knowledge of the FIRST principles to enhance unit test effectiveness and reliability.

FIRST: Properties of Good Tests

[F]IRST: [F]ast

F[I]RST: [I]solate Your Tests

FI[R]ST: Good Tests Should Be [R]epeatable

FIR[S]T: [S]elf-Validating

FIRS[T]: [T]imely

Quiz Time

What to Test: The Right-BICEP

8 Lessons

Investigate the Right-BICEP technique for structured unit testing, focusing on correctness, boundaries, inverses, cross-checks, errors, and performance.

Boundary Conditions: The CORRECT Way

8 Lessons

Piece together the parts of evaluating boundary conditions using the CORRECT acronym for thorough testing.

The Bigger Design Picture

5 Lessons

Try out refactoring techniques to optimize code clarity and maintainability using JUnit tests.

Bigger Design Issues

6 Lessons

Get started with applying SOLID principles, command-query separation, and optimizing test maintenance for better design.

10.

Using Mock Objects

7 Lessons

Break apart the use of mock objects to streamline and improve unit testing.

11.

Refactoring Tests

10 Lessons

Enhance your skills in refactoring tests to improve readability, maintainability, and effectiveness.

12.

The Bigger Unit-Testing Picture

10 Lessons

Dig deeper into Test-Driven Development, its cycle, incremental coding, refactoring, and effective test documentation.

13.

Testing Some Tough Stuff

6 Lessons

Tackle testing challenges in multithreaded code, application logic extraction, database testing, and mocking controllers.

14.

Testing on a Project

4 Lessons

Piece together the parts of unit testing, team standards, CI, and code coverage.

15.

Wrapping Up

1 Lesson

Get familiar with applying unit testing techniques in practice and continuously refining skills.

16.

Appendix - Setting up JUnit

2 Lessons

Unpack the core of setting up JUnit in IntelliJ IDEA and NetBeans.

Course Author

Trusted by 1.4 million developers working at companies

Anthony Walker

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Evan Dunbar

ML Engineer

Carlos Matias La Borde

Software Developer

Souvik Kundu

Front-end Developer

Vinay Krishnaiah

Software Developer

Eric Downs

Musician/Entrepeneur

Kenan Eyvazov

DevOps Engineer

Souvik Kundu

Front-end Developer

Eric Downs

Musician/Entrepeneur

Anthony Walker

@_webarchitect_

Evan Dunbar

ML Engineer

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