Skill

test-first

Guide for Test-First (Test-Driven) Development. Focuses on writing tests before implementation, ensuring comprehensive coverage and clear requirements. Covers test design, edge cases, and the Arrange-Act-Assert structure.

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Test-First Development (TDD) ensures that code is written to satisfy specific, predefined requirements, leading to higher quality and better design.

SKILL.md

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Last CommitFeb 11, 2026

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Test-First Development Skill

Test-First Development (TDD) ensures that code is written to satisfy specific, predefined requirements, leading to higher quality and better design.

TDD Workflow

Red: Write a failing test for a small piece of functionality.

Green: Write the minimum amount of code required to make the test pass.

Refactor: Clean up the code while ensuring the tests remain green.

Test Design Principles

1. Comprehensive Coverage

Normal Cases: Test the expected "happy path" behavior.

Boundary Values: Test inputs at the edges of valid ranges (e.g., 0, max_int, empty strings).

Edge Cases: Test unusual or extreme conditions (e.g., network timeout, disk full, null values).

Error Handling: Verify that the system fails gracefully and returns appropriate error messages.

2. Structure (Arrange-Act-Assert)

Follow the AAA pattern for clear and maintainable tests:

Arrange: Set up the necessary preconditions and inputs.

Act: Execute the function or method being tested.

Assert: Verify that the outcome matches the expectation.

Best Practices

One Assertion per Test: Aim to test a single concept per test case.

Descriptive Naming: Name tests clearly (e.g., test_should_reject_invalid_api_key).

Independence: Ensure tests do not depend on each other or on a specific execution order.

Fast Execution: Keep unit tests fast to encourage frequent execution.

Test-First Development Skill

Test-First Development (TDD) ensures that code is written to satisfy specific, predefined requirements, leading to higher quality and better design.

TDD Workflow

Red: Write a failing test for a small piece of functionality.
Green: Write the minimum amount of code required to make the test pass.
Refactor: Clean up the code while ensuring the tests remain green.

Test Design Principles

1. Comprehensive Coverage

Normal Cases: Test the expected "happy path" behavior.
Boundary Values: Test inputs at the edges of valid ranges (e.g., 0, max_int, empty strings).
Edge Cases: Test unusual or extreme conditions (e.g., network timeout, disk full, null values).
Error Handling: Verify that the system fails gracefully and returns appropriate error messages.

2. Structure (Arrange-Act-Assert)

Follow the AAA pattern for clear and maintainable tests:

Arrange: Set up the necessary preconditions and inputs.
Act: Execute the function or method being tested.
Assert: Verify that the outcome matches the expectation.

Best Practices

One Assertion per Test: Aim to test a single concept per test case.
Descriptive Naming: Name tests clearly (e.g., test_should_reject_invalid_api_key).
Independence: Ensure tests do not depend on each other or on a specific execution order.
Fast Execution: Keep unit tests fast to encourage frequent execution.