unit-test-parameterized

SKILL.md

JUnit 5 parameterized testing patterns for running single test methods with multiple input combinations.

Supports multiple data sources: @ValueSource for simple values, @CsvSource for tabular data, @MethodSource for complex objects, @EnumSource for enum testing, and custom ArgumentsProvider implementations

Includes boundary value testing, edge case coverage, and systematic validation of multiple scenarios with reduced test duplication

Offers custom display names for readable test output and @RepeatedTest for concurrent or flaky test detection

Requires junit-jupiter-params dependency on test classpath; parameter count and types must match test method signature

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