Unit Test Parameterized

Generates JUnit 5 parameterized tests so you can run the same test logic against multiple input combinations without duplicating code. Covers @ValueSource for primitives and strings, @CsvSource for tabular test cases, @MethodSource when you need complex objects, and @EnumSource for enum exhaustiveness checks. Good for boundary value testing, email validation with known good and bad inputs, that sort of thing. The examples show readable patterns with custom display names and proper assertion structure. Watch out for the parameter count matching requirement and remember @MethodSource factory methods must be static. Honestly just saves you from writing fifteen nearly identical test methods when you could write one with fifteen parameter sets.

skills.sh installs: 3.9K
GitHub stars: 369
last updated: Aug 21, 2026

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Install

$ npx -y skills add giuseppe-trisciuoglio/developer-kit --skill unit-test-parameterized --agent claude-code

Installs into .claude/skills of the current project.

Files

Parameterized Unit Tests with JUnit 5

Overview

Provides patterns for parameterized unit tests in Java using JUnit 5. Covers @ValueSource, @CsvSource, @MethodSource, @EnumSource, @ArgumentsSource, and custom display names. Reduces test duplication by running the same test logic with multiple input values.

When to Use

Writing JUnit tests with multiple input combinations
Implementing data-driven tests in Java
Running same test with different values (boundary analysis)
Testing multiple scenarios from single test method

Instructions

Add dependency: Ensure junit-jupiter-params is on test classpath (included in junit-jupiter)
Choose source: @ValueSource for simple values, @CsvSource for tabular data, @MethodSource for complex objects
Match parameters: Test method parameters must match data source types
Set display names: Use name = "{0}..." for readable output
Validate: Run ./gradlew test --info or mvn test and verify all parameter combinations execute