bun.sh/test/bun.js/process-stdio.test.ts

import { spawnSync } from "bun";
import { describe, expect, it, test } from "bun:test";
import { bunExe } from "bunExe";
import { isatty } from "tty";

test("process.stdout", () => {
  expect(process.stdout).toBeDefined();
  expect(process.stdout.isTTY).toBe(isatty(1));
});

test("process.stderr", () => {
  expect(process.stderr).toBeDefined();
  expect(process.stderr.isTTY).toBe(isatty(2));
});

test("process.stdout - write", () => {
  const { stdout } = spawnSync({
    cmd: [bunExe(), import.meta.dir + "/stdio-test-instance.js"],
    stdout: "pipe",
    stdin: null,
    stderr: null,
    env: {
      ...process.env,
      BUN_DEBUG_QUIET_LOGS: "1",
    },
  });

  expect(stdout?.toString()).toBe(
    `hello worldhello again|😋 Get Emoji — All Emojis to ✂️ Copy and 📋 Paste 👌`,
  );
});

test("process.stdout - write a lot (string)", () => {
  const { stdout } = spawnSync({
    cmd: [bunExe(), import.meta.dir + "/stdio-test-instance-a-lot.js"],
    stdout: "pipe",
    stdin: null,
    stderr: null,
    env: {
      ...process.env,
      BUN_DEBUG_QUIET_LOGS: "1",
      TEST_STDIO_STRING: "1",
    },
  });

  expect(stdout?.toString()).toBe(
    `hello worldhello again|😋 Get Emoji — All Emojis to ✂️ Copy and 📋 Paste 👌`.repeat(
      9999,
    ),
  );
});

test("process.stdout - write a lot (bytes)", () => {
  const { stdout } = spawnSync({
    cmd: [bunExe(), import.meta.dir + "/stdio-test-instance-a-lot.js"],
    stdout: "pipe",
    stdin: null,
    stderr: null,
    env: {
      ...process.env,
      BUN_DEBUG_QUIET_LOGS: "1",
    },
  });
  expect(stdout?.toString()).toBe(
    `hello worldhello again|😋 Get Emoji — All Emojis to ✂️ Copy and 📋 Paste 👌`.repeat(
      9999,
    ),
  );
});