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ocaml-testing

Structure OCaml unit tests with Alcotest and Dune.

46|6|Updated Jan 28, 2026
Search Tags:#testing#mocking#unit-testing#ocaml#dune#eio#alcotest
One-click install
npx skills add https://github.com/aresbit/MateBot --skill ocaml-testing
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: ocaml-testing
Source: https://github.com/aresbit/MateBot/tree/main/skills/ocaml/ocaml-testing
Command: npx skills add https://github.com/aresbit/MateBot --skill ocaml-testing

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill provides a structured approach to designing, implementing, and evaluating OCaml tests, helping teams improve reliability and maintainability of OCaml libraries.

Core Features & Use Cases

  • Unit test discipline: ensures each lib/.ml module has a corresponding test_.ml in test/, promoting clear coverage.
  • Deterministic testing: advocates mocks and isolated tests to keep test runs fast and repeatable.
  • Guided setup: outlines a conventional project layout (lib/, test/, dune) and how to wire Alcotest test suites with a single runner.
  • Use Case: when starting a new OCaml project, use this Skill to define test architecture, select tools (Alcotest, Dune), and plan mock strategies for IO.

Quick Start

  1. Create a project structure as shown in the example and add a simple test module, e.g., test/test_user.ml, using Alcotest.
  2. Add a dune file that runs the tests with Alcotest and run dune runtest.
  3. Iterate on tests to cover each lib/.ml module with a corresponding test_.ml file.

Frequently Asked Questions about ocaml-testing

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I structure OCaml unit tests using Dune and Alcotest?▼

Structure OCaml tests by placing a test_*.ml file in the test/ directory for each lib/*.ml module, wiring Alcotest suites with a single runner, and executing them using dune runtest.

What is the standard project layout for deterministic OCaml testing?▼

A standard deterministic OCaml testing layout uses lib/ for source modules, test/ for Alcotest suites, and a dune file to configure the build and isolate tests using mocks for fast, repeatable runs.

How do I mock IO in OCaml unit tests to keep them deterministic?▼

Keep OCaml tests deterministic by applying mock strategies for IO within isolated test suites, ensuring fast and repeatable test runs without relying on external side effects.

Does this approach enforce 1:1 test coverage for OCaml libraries?▼

Yes, this approach enforces 1:1 test coverage by requiring each lib/*.ml module to have a corresponding test_*.ml file, promoting clear naming conventions and comprehensive unit test discipline.

Can I use Eio with Alcotest for OCaml testing?▼

Yes, you can use Eio with Alcotest when structuring OCaml tests, leveraging Eio for IO operations while applying mock strategies to build deterministic and isolated test suites.

Why should I use a single runner for Alcotest test suites?▼

Using a single runner for Alcotest test suites centralizes test execution, simplifies project configuration in Dune, and ensures consistent reporting across all module tests.

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