Learn Java Unit Testing with JUnit 5 in 20 Steps

Learn Java Unit Testing with JUnit 5 in 20 Steps

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JUnit tutorial for beginners with examples

JUnit is a unit testing framework for the Java programming language.
JUnit has been important in the development of test-driven development and is one of a family of unit testing frameworks which is collectively known as xUnit frameworks.
In this beginners tutorial on JUnit, you will learn how to

  • Create a new project for JUnit tests
  • Create, run and debug JUnit tests
  • Write good unit tests
  • Use assert methods
  • Use basic JUnit annotations – @Test, @Before, @After, @AfterClass, @BeforeClass, @Suite
  • Test performance and exceptions in unit tests
  • Write parameterized tests
  • Adhere to JUnit best practices
  • Use Eclipse to write and run JUnit tests
Table of Contents

JUnit 5
1 Introduction
2 Course Overview
3 Step 01 – Introduction to Unit Testing – Test Pyramid
4 Step 02 – First Junit Test – Red bar
5 Step 03 – Absence of failure is success
6 Step 04 – First Unit Test with JUnit – String length() method
7 Step 05 – Writing JUnit Assertions – assertNull and assertTrue
8 Step 06 – Writing Assertions for Arrays – assertArrayEquals
9 Step 07 – Setting up data for every test – @BeforeEach, @AfterEach
10 Step 08 – Setting up database connections – @BeforeAll, @AfterAll
11 Step 09 – Tip – Testing Exceptions with Junit
12 Step 10 – Tip – @DisplayName and test methods need not be public
13 Step 11 – Basics of Parameterized tests
14 Step 12 – Advanced Paramaterized Tests with Csv Source
15 Step 13 – Tip – Giving a name to a Parameterized Test
16 Step 14 – Tip – Repeat same test multiple times
17 Step 15 – Tip – Unit Testing for Performance
18 Step 16 – Tip – Disable Unit Tests
19 Step 17 – Tip – Grouping Tests with @Nested
20 Step 18 – Tip – JUnit 5 = Platform + Jupiter + Vintage
21 Step 19 – Tip – JUnit 4 vs JUnit 5
22 Step 20 – Tip – JUnit Best Practices
23 Step 21 – Tip – JUnit Patterns – xunitpatterns

JUnit 4
24 Step 99 – JUnit 4 Section – First Version of the course
25 Getting Ready for Hello World
26 Your First JUnit Success – Green Bar
27 Refactoring – Improving the Junit
28 assertTrue and assertFalse
29 @Before and @After
30 @BeforeClass and @AfterClass
31 Comparing Arrays – assertArrayEquals
32 Unit Testing Exceptions
33 Unit Testing for Performance
34 Parameterized JUnit Tests
35 Organizing Unit Tests into Suites
36 How do you write good Unit Tests
37 Conclusion