From 06380e2e65fa77f4c8257c773db75fbec7cc3b7b Mon Sep 17 00:00:00 2001
From: pfg <pfg@pfg.pw>
Date: Wed, 26 Mar 2025 20:09:42 -0700
Subject: [PATCH] add tests

---
 .../test-child-process-exec-maxbuf.js         | 146 ++++++++++++++++++
 .../test-child-process-execfile-maxbuf.js     |  92 +++++++++++
 2 files changed, 238 insertions(+)
 create mode 100644 test/js/node/test/parallel/test-child-process-exec-maxbuf.js
 create mode 100644 test/js/node/test/parallel/test-child-process-execfile-maxbuf.js

diff --git a/test/js/node/test/parallel/test-child-process-exec-maxbuf.js b/test/js/node/test/parallel/test-child-process-exec-maxbuf.js
new file mode 100644
index 0000000000..d13454d25b
--- /dev/null
+++ b/test/js/node/test/parallel/test-child-process-exec-maxbuf.js
@@ -0,0 +1,146 @@
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const cp = require('child_process');
+
+function runChecks(err, stdio, streamName, expected) {
+  assert.strictEqual(err.message, `${streamName} maxBuffer length exceeded`);
+  assert(err instanceof RangeError);
+  assert.strictEqual(err.code, 'ERR_CHILD_PROCESS_STDIO_MAXBUFFER');
+  assert.deepStrictEqual(stdio[streamName], expected);
+}
+
+// The execPath might contain chars that should be escaped in a shell context.
+// On non-Windows, we can pass the path via the env; `"` is not a valid char on
+// Windows, so we can simply pass the path.
+const execNode = (args, optionsOrCallback, callback) => {
+  const [cmd, opts] = common.escapePOSIXShell`"${process.execPath}" `;
+  let options = optionsOrCallback;
+  if (typeof optionsOrCallback === 'function') {
+    options = undefined;
+    callback = optionsOrCallback;
+  }
+  return cp.exec(
+    cmd + args,
+    { ...opts, ...options },
+    callback,
+  );
+};
+
+// default value
+{
+  execNode(`-e "console.log('a'.repeat(1024 * 1024))"`, common.mustCall((err) => {
+    assert(err instanceof RangeError);
+    assert.strictEqual(err.message, 'stdout maxBuffer length exceeded');
+    assert.strictEqual(err.code, 'ERR_CHILD_PROCESS_STDIO_MAXBUFFER');
+  }));
+}
+
+// default value
+{
+  execNode(`-e "console.log('a'.repeat(1024 * 1024 - 1))"`, common.mustSucceed((stdout, stderr) => {
+    assert.strictEqual(stdout.trim(), 'a'.repeat(1024 * 1024 - 1));
+    assert.strictEqual(stderr, '');
+  }));
+}
+
+{
+  const options = { maxBuffer: Infinity };
+
+  execNode(`-e "console.log('hello world');"`, options, common.mustSucceed((stdout, stderr) => {
+    assert.strictEqual(stdout.trim(), 'hello world');
+    assert.strictEqual(stderr, '');
+  }));
+}
+
+{
+  const cmd = 'echo hello world';
+
+  cp.exec(
+    cmd,
+    { maxBuffer: 5 },
+    common.mustCall((err, stdout, stderr) => {
+      runChecks(err, { stdout, stderr }, 'stdout', 'hello');
+    })
+  );
+}
+
+// default value
+{
+  execNode(
+    `-e "console.log('a'.repeat(1024 * 1024))"`,
+    common.mustCall((err, stdout, stderr) => {
+      runChecks(
+        err,
+        { stdout, stderr },
+        'stdout',
+        'a'.repeat(1024 * 1024)
+      );
+    })
+  );
+}
+
+// default value
+{
+  execNode(`-e "console.log('a'.repeat(1024 * 1024 - 1))"`, common.mustSucceed((stdout, stderr) => {
+    assert.strictEqual(stdout.trim(), 'a'.repeat(1024 * 1024 - 1));
+    assert.strictEqual(stderr, '');
+  }));
+}
+
+const unicode = '中文测试'; // length = 4, byte length = 12
+
+{
+  execNode(
+    `-e "console.log('${unicode}');"`,
+    { maxBuffer: 10 },
+    common.mustCall((err, stdout, stderr) => {
+      runChecks(err, { stdout, stderr }, 'stdout', '中文测试\n');
+    })
+  );
+}
+
+{
+  execNode(
+    `-e "console.error('${unicode}');"`,
+    { maxBuffer: 3 },
+    common.mustCall((err, stdout, stderr) => {
+      runChecks(err, { stdout, stderr }, 'stderr', '中文测');
+    })
+  );
+}
+
+{
+  const child = execNode(
+    `-e "console.log('${unicode}');"`,
+    { encoding: null, maxBuffer: 10 },
+    common.mustCall((err, stdout, stderr) => {
+      runChecks(err, { stdout, stderr }, 'stdout', '中文测试\n');
+    })
+  );
+
+  child.stdout.setEncoding('utf-8');
+}
+
+{
+  const child = execNode(
+    `-e "console.error('${unicode}');"`,
+    { encoding: null, maxBuffer: 3 },
+    common.mustCall((err, stdout, stderr) => {
+      runChecks(err, { stdout, stderr }, 'stderr', '中文测');
+    })
+  );
+
+  child.stderr.setEncoding('utf-8');
+}
+
+{
+  execNode(
+    `-e "console.error('${unicode}');"`,
+    { encoding: null, maxBuffer: 5 },
+    common.mustCall((err, stdout, stderr) => {
+      const buf = Buffer.from(unicode).slice(0, 5);
+      runChecks(err, { stdout, stderr }, 'stderr', buf);
+    })
+  );
+}
diff --git a/test/js/node/test/parallel/test-child-process-execfile-maxbuf.js b/test/js/node/test/parallel/test-child-process-execfile-maxbuf.js
new file mode 100644
index 0000000000..22fb9264ea
--- /dev/null
+++ b/test/js/node/test/parallel/test-child-process-execfile-maxbuf.js
@@ -0,0 +1,92 @@
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const { execFile } = require('child_process');
+
+function checkFactory(streamName) {
+  return common.mustCall((err) => {
+    assert(err instanceof RangeError);
+    assert.strictEqual(err.message, `${streamName} maxBuffer length exceeded`);
+    assert.strictEqual(err.code, 'ERR_CHILD_PROCESS_STDIO_MAXBUFFER');
+  });
+}
+
+// default value
+{
+  execFile(
+    process.execPath,
+    ['-e', 'console.log("a".repeat(1024 * 1024))'],
+    checkFactory('stdout')
+  );
+}
+
+// default value
+{
+  execFile(
+    process.execPath,
+    ['-e', 'console.log("a".repeat(1024 * 1024 - 1))'],
+    common.mustSucceed((stdout, stderr) => {
+      assert.strictEqual(stdout.trim(), 'a'.repeat(1024 * 1024 - 1));
+      assert.strictEqual(stderr, '');
+    })
+  );
+}
+
+{
+  const options = { maxBuffer: Infinity };
+
+  execFile(
+    process.execPath,
+    ['-e', 'console.log("hello world");'],
+    options,
+    common.mustSucceed((stdout, stderr) => {
+      assert.strictEqual(stdout.trim(), 'hello world');
+      assert.strictEqual(stderr, '');
+    })
+  );
+}
+
+{
+  execFile('echo', ['hello world'], { maxBuffer: 5 }, checkFactory('stdout'));
+}
+
+const unicode = '中文测试'; // length = 4, byte length = 12
+
+{
+  execFile(
+    process.execPath,
+    ['-e', `console.log('${unicode}');`],
+    { maxBuffer: 10 },
+    checkFactory('stdout'));
+}
+
+{
+  execFile(
+    process.execPath,
+    ['-e', `console.error('${unicode}');`],
+    { maxBuffer: 10 },
+    checkFactory('stderr')
+  );
+}
+
+{
+  const child = execFile(
+    process.execPath,
+    ['-e', `console.log('${unicode}');`],
+    { encoding: null, maxBuffer: 10 },
+    checkFactory('stdout')
+  );
+
+  child.stdout.setEncoding('utf-8');
+}
+
+{
+  const child = execFile(
+    process.execPath,
+    ['-e', `console.error('${unicode}');`],
+    { encoding: null, maxBuffer: 10 },
+    checkFactory('stderr')
+  );
+
+  child.stderr.setEncoding('utf-8');
+}