การทดสอบแอปพลิเคชัน Deno

Deno ships with a built-in test runner — no extra framework or config needed. Just write tests and run deno test.

Register a test with Deno.test. It takes a name and a function.

Use the standard library's assertions for clearer failures instead of manual throws.

Run all tests in your project. Deno discovers files ending in _test.ts or .test.ts automatically.

Tests can be async — just return a promise or mark the function async. Deno awaits it before reporting.

Break a complex test into named steps with t.step for clearer output and partial results.

Tests obey Deno's permission model. A test needing network access fails without --allow-net, so you test real security boundaries.

The std testing module provides spies, stubs, and mocks to isolate units from external services.

Deno's assertSnapshot stores expected output and compares future runs against it — great for stable structured responses.

Measure how much code your tests exercise with the built-in coverage tools.

Structure handlers as pure functions of a Request so you can test them without a running server — ideal for edge code.

Test your Deno testing knowledge.

You learned to write tests with Deno.test, use std assertions, handle async and steps, respect permissions, mock dependencies, and measure coverage — keeping your edge code reliable.