Files
bun.sh/test
Claude Bot 89d967f479 Address CodeRabbit review feedback
1. Remove unused #include <stdio.h> from socket.c
   - stdio.h was added for debug logging but is no longer needed

2. Fix SSL branch in uws_app_accept()
   - SSL/TLS socket acceptance now properly rejects with -1
   - Added comment explaining proper implementation would require
     us_socket_wrap_with_tls() + us_socket_open() for TLS handshake
   - Avoids unsafe construction of TLS HttpResponseData on non-TLS socket

3. Add #include <new> for placement new
   - Required for placement new syntax used in HttpResponseData initialization

4. Update accept() documentation with ownership semantics
   - Clarifies that app takes FD ownership on success
   - Caller retains ownership and must close FD on failure
   - Notes that SSL/TLS is not currently supported

5. Optimize test buffer allocations
   - Large POST body: Use Buffer.alloc(10000, 0x78).toString() instead of "x".repeat(10000)
   - Binary upload: Use Buffer.allocUnsafe(1000) and i & 0xff for faster allocation

All tests still pass (7 pass, 279 expect() calls).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
2025-10-16 16:51:41 +00:00
..
2025-09-26 03:06:18 -07:00
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Tests

Finding tests

Tests are located in the test/ directory and are organized using the following structure:

  • test/
    • js/ - tests for JavaScript APIs.
    • cli/ - tests for commands, configs, and stdout.
    • bundler/ - tests for the transpiler/bundler.
    • regression/ - tests that reproduce a specific issue.
    • harness.ts - utility functions that can be imported from any test.

The tests in test/js/ directory are further categorized by the type of API.

  • test/js/
    • bun/ - tests for Bun-specific APIs.
    • node/ - tests for Node.js APIs.
    • web/ - tests for Web APIs, like fetch().
    • first_party/ - tests for npm packages that are built-in, like undici.
    • third_party/ - tests for npm packages that are not built-in, but are popular, like esbuild.

Running tests

To run a test, use Bun's built-in test command: bun test.

bun test # Run all tests
bun test js/bun # Only run tests in a directory
bun test sqlite.test.ts # Only run a specific test

If you encounter lots of errors, try running bun install, then trying again.

Writing tests

Tests are written in TypeScript (preferred) or JavaScript using Jest's describe(), test(), and expect() APIs.

import { describe, test, expect } from "bun:test";
import { gcTick } from "harness";

describe("TextEncoder", () => {
  test("can encode a string", async () => {
    const encoder = new TextEncoder();
    const actual = encoder.encode("bun");
    await gcTick();
    expect(actual).toBe(new Uint8Array([0x62, 0x75, 0x6E]));
  });
});

If you are fixing a bug that was reported from a GitHub issue, remember to add a test in the test/regression/ directory.

// test/regression/issue/02005.test.ts

import { it, expect } from "bun:test";

it("regex literal should work with non-latin1", () => {
  const text = "这是一段要替换的文字";
  expect(text.replace(new RegExp("要替换"), "")).toBe("这是一段的文字");
  expect(text.replace(/要替换/, "")).toBe("这是一段的文字");
});

In the future, a bot will automatically close or re-open issues when a regression is detected or resolved.

Zig tests

These tests live in various .zig files throughout Bun's codebase, leveraging Zig's builtin test keyword.

Currently, they're not run automatically nor is there a simple way to run all of them. We will make this better soon.

TypeScript

Test files should be written in TypeScript. The types in packages/bun-types should be updated to support all new APIs. Changes to the .d.ts files in packages/bun-types will be immediately reflected in test files; no build step is necessary.

Writing a test will often require using invalid syntax, e.g. when checking for errors when an invalid input is passed to a function. TypeScript provides a number of escape hatches here.

  • // @ts-expect-error - This should be your first choice. It tells TypeScript that the next line should fail typechecking.
  • // @ts-ignore - Ignore the next line entirely.
  • // @ts-nocheck - Put this at the top of the file to disable typechecking on the entire file. Useful for autogenerated test files, or when ignoring/disabling type checks an a per-line basis is too onerous.