Testing with Mocking

Create test doubles and verify interactions using MockBox for ColdBox apps.

Updated Jan 18, 2026

Search Tags:#unit testing #test doubles #mocking #dependency isolation #MockBox

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npx skills add https://github.com/mrigsby/ITB2026-Under-The-Wire --skill testing-with-mocking

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Skill: Testing with Mocking
Source: https://github.com/mrigsby/ITB2026-Under-The-Wire/tree/main/.ai/skills/core/testing-mocking
Command: npx skills add https://github.com/mrigsby/ITB2026-Under-The-Wire --skill testing-with-mocking

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires coldbox.system.testing.MockBox, and includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill addresses the challenges of testing code that relies on external dependencies, enabling developers to write reliable and efficient tests without the need for actual external services or databases.

Core Features & Use Cases

MockBox Framework Integration: Offers a robust mocking framework within the TestBox testing suite.
Test Doubles Creation: Allows the creation of mocks, stubs, spies, and partial mocks for isolating dependencies.
Verifying Interactions: Provides tools to verify method calls, arguments, and call order.
Use Case: For a developer working on an e-commerce application, this Skill allows mocking the payment service to test order processing without the need for real transactions.

Quick Start

Utilize the MockBox framework to create a mock for your UserDAO and test the UserService's createUser function.

Frequently Asked Questions about Testing with Mocking

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

FAQPage Schema

How do I isolate dependencies for unit testing in a ColdBox application?▼

You isolate dependencies for unit testing by using MockBox to create test doubles like mocks, stubs, and spies. This framework allows you to simulate external services and databases, enabling reliable tests without actual external integrations.

What is the best way to mock a payment service for testing order processing?▼

The best way to mock a payment service is creating a test double with MockBox. This isolates the dependency entirely, allowing you to verify order processing logic and method interactions without executing real transactions.

Can I verify method calls and arguments when stubbing dependencies with MockBox?▼

Yes, you can verify method calls, arguments, and call order when stubbing dependencies with MockBox. It provides specific tools to monitor and assert interactions, ensuring your isolated components behave exactly as expected during tests.

Do I need TestBox to create test doubles and partial mocks for ColdBox apps?▼

You need MockBox, which operates within the TestBox testing suite, to create test doubles and partial mocks for ColdBox apps. It functions as the dedicated mocking and stubbing framework for this specific development environment.

Why does my unit test fail when trying to connect to an external database?▼

Your unit test likely fails because it attempts a real external database connection. You should use MockBox to create stubs for your data access objects, isolating the tested logic from the actual external service to prevent failures.

What types of test doubles can I generate for dependency isolation?▼

You can generate mocks, stubs, spies, and partial mocks for dependency isolation. MockBox supports creating these various test doubles to simulate external dependencies and verify interactions within your ColdBox applications.