bun.sh/test/js/node/test_runner/node-test.test.ts

import { spawn } from "bun";
import { describe, expect, test } from "bun:test";
import { bunEnv, bunExe } from "harness";
import { join } from "node:path";

describe("node:test", () => {
  test("should run basic tests", async () => {
    const { exitCode, stderr } = await runTests(["01-harness.js"]);
    expect({ exitCode, stderr }).toMatchObject({
      exitCode: 0,
      stderr: expect.stringContaining("0 fail"),
    });
  });

  test("should run hooks in the right order", async () => {
    const { exitCode, stderr } = await runTests(["02-hooks.js"]);
    expect({ exitCode, stderr }).toMatchObject({
      exitCode: 0,
      stderr: expect.stringContaining("0 fail"),
    });
  });

  test("should run tests with different variations", async () => {
    const { exitCode, stderr } = await runTests(["03-test-variations.js"]);
    expect({ exitCode, stderr }).toMatchObject({
      exitCode: 0,
      stderr: expect.stringContaining("0 fail"),
    });
  });

  test("should run async tests", async () => {
    const { exitCode, stderr } = await runTests(["04-async-tests.js"]);
    expect({ exitCode, stderr }).toMatchObject({
      exitCode: 0,
      stderr: expect.stringContaining("0 fail"),
    });
  });

  test("should run all tests from multiple files", async () => {
    const { exitCode, stderr } = await runTests(["01-harness.js", "02-hooks.js"]);
    expect({ exitCode, stderr }).toMatchObject({
      exitCode: 0,
      // 32 from 01-harness + 3 from 02-hooks
      stderr: expect.stringContaining("35 pass"),
    });
  });

  test("should throw NotImplementedError if you call test() or describe() inside another test()", async () => {
    const { exitCode, stderr } = await runTests(["05-test-in-test.js"]);
    expect({ exitCode, stderr }).toMatchObject({
      exitCode: 0,
      stderr: expect.stringContaining("0 fail"),
    });
  });
});

async function runTests(filenames: string[]) {
  const testPaths = filenames.map(filename => join(import.meta.dirname, "fixtures", filename));
  const {
    exited,
    stdout: stdoutStream,
    stderr: stderrStream,
  } = spawn({
    cmd: [bunExe(), "test", ...testPaths],
    env: bunEnv,
    stderr: "pipe",
  });
  const [exitCode, stdout, stderr] = await Promise.all([
    exited,
    new Response(stdoutStream).text(),
    new Response(stderrStream).text(),
  ]);
  return { exitCode, stdout, stderr };
}