JUnit 5 Fundamentals

Grouping tests with @Tag

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Overview

In this lesson, we are going to look into a meta-annotation used for grouping tests together, @Tag. It's the successor to JUnit 4's Category, and allows developers to tag tests with String identifiers, then later drive the execution of their test suite based on these tags. We'll explore how the Gradle build system can include or exclude specific tests in both Java and Android environments.

Summary

Similar tests may be tagged with the same ID (think "end-to-end tests" vs. "UI tests")
Marking slow-running tests may improve your daily workflow for running tests
Gradle provides a DSL to include and exclude tags
Java: test.useJunitPlatform.include/excludeTags
Android: android.testOptions.junitPlatform.filters.include/excludeTags
Android can specify different include/exclude statements per variant

Instructor

Marcel Schnelle

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Lessons in JUnit 5 Fundamentals

Understand the Core Components of JUnit 5

Set up your Java Project for JUnit 5

Set up your Android Project for JUnit 5

The first @Test

Lifecycle with @BeforeEach & @AfterEach

Lifecycle with @BeforeAll & @AfterAll

Using 1 Instance per Method with @TestInstance

Using 1 Instance per Class with @TestInstance

Taking advantage of @TestInstance(PER_CLASS) in Kotlin

Bearable Test Method Names with @DisplayName

Checking for equality with assertEquals() & Friends

Using assertTrue() & assertFalse()

Testing Exceptions with assertThrows()

Composing Assertions with assertAll()

Avoiding failure with Assumptions

Ignoring Tests with @Disabled

Conditional Test Execution Pairs: @EnabledOnOs & @DisabledOnOs

Conditional Test Execution Pairs: @EnabledOnJre & @DisabledOnJre

Conditional Test Execution Pairs: @EnabledIfSystemProperty & @DisabledIfSystemProperty

Conditional Test Execution Pairs: @EnabledIfEnvironmentVariable & @DisabledIfEnvironmentVariable

Conditional Test Execution Pairs: @EnabledIf & @DisabledIf

Grouping tests with @Tag

@Nested & Effective BDD in JUnit 5

Running a test multiple times with @RepeatedTest

@ParameterizedTest with @ValueSource

@ParameterizedTest with @EnumSource

@ParameterizedTest with @MethodSource

@ParameterizedTest with @CsvSource & @CsvFileSource

Argument Conversion Techniques for Parameterized Tests

Writing a custom @Source for Parameterized Tests

Introduction to @TestFactory and Dynamic Tests

Grouping Dynamic Tests into Containers

Lifecycle Caveats for Dynamic Tests

Setting up Parallel Test Execution

Parallel Execution Strategies: Dynamic

Parallel Execution Strategies: Fixed

Parallel Execution Strategies: Custom

Synchronizing Parallel Test Execution with @ResourceLock