Generate Mockito mocks and build_runner outputs for test dependencies.
dart-generate-test-mocks/SKILL.md
---
name: dart-generate-test-mocks
description: Define and generate mock objects for external dependencies using `package:mockito` and `build_runner`. Use when unit testing classes that depend on complex external services like APIs or databases.
metadata:
model: models/gemini-3.1-pro-preview
last_modified: Fri, 24 Apr 2026 15:13:58 GMT
---
# Testing and Mocking Dart Applications
## Contents
- [Structuring Code for Testability](#structuring-code-for-testability)
- [Managing Dependencies](#managing-dependencies)
- [Generating Mocks](#generating-mocks)
- [Implementing Unit Tests](#implementing-unit-tests)
- [Workflow: Creating and Running Mocked Tests](#workflow-creating-and-running-mocked-tests)
- [Examples](#examples)
## Structuring Code for Testability
Design Dart classes to support dependency injection. Isolate complex external dependencies (like API clients or databases) so they can be replaced with mock objects during testing.
- Inject external services (e.g., `http.Client`) through class constructors.
- Represent URLs strictly as `Uri` objects using `Uri.parse(string)`.
- Utilize Dart's object-oriented features (classes, mixins) to define clear interfaces for external interactions.
## Managing Dependencies… load the full skill through Skill Me