What testing framework is used?

This skill is specifically designed for the Vitest framework, following the conventions of the @duplojs/utils project.

How does it handle functional programming patterns?

The skill includes mandatory checks for pipe compatibility, ensuring that functions work correctly within a pipe() utility using curried overloads.

Can it generate tests for Type Guards and Predicates?

Absolutely. It identifies predicate functions and uses specialized templates that verify narrowing via 'if' blocks and 'when' utility calls.

Does this skill support strict TypeScript type testing?

Yes, it enforces the use of ExpectType in strict mode to ensure that the runtime output matches the expected TypeScript types exactly.

Does it support shared test fixtures?

To ensure maximum isolation and maintainability, the skill follows a 'no shared helpers' rule, making every 'it' block completely autonomous.

Vitest Unit Test Writer

Name: Vitest Unit Test Writer
Author: duplojs

byduplojs

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Security & Testing

Generates and updates high-coverage Vitest unit tests for TypeScript functions with strict type-checking and pipe compatibility.

About

The writeUnitTest skill automates the creation of robust unit tests tailored for the DuploJS utility ecosystem. It ensures every function is tested for runtime correctness, strict TypeScript type assertions using ExpectType, and compatibility within functional programming pipes. By intelligently selecting between standard, predicate, and higher-order function templates, it maintains a consistent testing architecture that eliminates shared helpers and targets 100% code coverage across all branches and edge cases.

Key Features

Mandatory pipe compatibility and curried signature verification
Strict TypeScript type-level testing with ExpectType
11 GitHub stars
Independent test structure to ensure maintainability and isolation
Automated Vitest test file generation and updates
Context-aware template selection for predicates and type guards

Use Cases

Ensuring strict type safety and narrowing for complex Type Guards
Maintaining 100% test coverage in a high-scale TypeScript utility library
Generating boilerplate-free unit tests for new TypeScript utility functions

About

Key Features

Mandatory pipe compatibility and curried signature verification
Strict TypeScript type-level testing with ExpectType
11 GitHub stars
Independent test structure to ensure maintainability and isolation
Automated Vitest test file generation and updates
Context-aware template selection for predicates and type guards

Use Cases

Ensuring strict type safety and narrowing for complex Type Guards
Maintaining 100% test coverage in a high-scale TypeScript utility library
Generating boilerplate-free unit tests for new TypeScript utility functions