test-patterns

name	test-patterns
description	Write and run tests across languages and frameworks. Use when setting up test suites, writing unit/integration/E2E tests, measuring coverage, mocking dependencies, or debugging test failures. Covers Node.js (Jest/Vitest), Python (pytest), Go, Rust, and Bash.
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Test Patterns

Write, run, and debug tests across languages. Covers unit tests, integration tests, E2E tests, mocking, coverage, and TDD workflows.

When to Use

• Setting up a test suite for a new project
• Writing unit tests for functions or modules
• Writing integration tests for APIs or database interactions
• Setting up code coverage measurement
• Mocking external dependencies (APIs, databases, file system)
• Debugging flaky or failing tests
• Implementing test-driven development (TDD)

Node.js (Jest / Vitest)

Setup

# Jest
npm install -D jest
# Add to package.json: "scripts": { "test": "jest" }

# Vitest (faster, ESM-native)
npm install -D vitest
# Add to package.json: "scripts": { "test": "vitest" }

Unit Tests

// math.js
export function add(a, b) { return a + b; }
  () {
   (b === )   ();
   a / b;
}


 { add, divide }  ;

(,  {
  (,  {
    ((, )).();
  });

  (,  {
    ((-, )).();
  });

  (,  {
    ((, )).();
  });
});

(,  {
  (,  {
    ((, )).();
  });

  (,  {
    ( (, )).();
  });

  (,  {
    ((, )).(, );
  });
});