1 files changed, 76 insertions, 0 deletions
diff --git a/tests/node_compat/test/parallel/test-child-process-execsync-maxbuf.js b/tests/node_compat/test/parallel/test-child-process-execsync-maxbuf.js
new file mode 100644
index 000000000..703896ef1
--- /dev/null
+++ b/tests/node_compat/test/parallel/test-child-process-execsync-maxbuf.js
@@ -0,0 +1,76 @@
+// deno-fmt-ignore-file
+// deno-lint-ignore-file
+
+// Copyright Joyent and Node contributors. All rights reserved. MIT license.
+// Taken from Node 18.8.0
+// This file is automatically generated by "node/_tools/setup.ts". Do not modify this file manually
+
+// TODO(cjihrig): This should use Node's -e instead of Deno's eval CLI arg.
+
+'use strict';
+require('../common');
+
+// This test checks that the maxBuffer option for child_process.spawnSync()
+// works as expected.
+
+const assert = require('assert');
+const { getSystemErrorName } = require('util');
+const { execSync } = require('child_process');
+const msgOut = 'this is stdout';
+const msgOutBuf = Buffer.from(`${msgOut}\n`);
+
+const args = [
+  'eval',
+  `"console.log('${msgOut}')";`,
+];
+
+// Verify that an error is returned if maxBuffer is surpassed.
+{
+  assert.throws(() => {
+    execSync(`"${process.execPath}" ${args.join(' ')}`, { maxBuffer: 1 });
+  }, (e) => {
+    assert.ok(e, 'maxBuffer should error');
+    assert.strictEqual(e.code, 'ENOBUFS');
+    assert.strictEqual(getSystemErrorName(e.errno), 'ENOBUFS');
+    // We can have buffers larger than maxBuffer because underneath we alloc 64k
+    // that matches our read sizes.
+    assert.deepStrictEqual(e.stdout, msgOutBuf);
+    return true;
+  });
+}
+
+// Verify that a maxBuffer size of Infinity works.
+{
+  const ret = execSync(
+    `"${process.execPath}" ${args.join(' ')}`,
+    { maxBuffer: Infinity }
+  );
+
+  assert.deepStrictEqual(ret, msgOutBuf);
+}
+
+// Default maxBuffer size is 1024 * 1024.
+{
+  assert.throws(() => {
+    execSync(
+      `"${process.execPath}" eval "console.log('a'.repeat(1024 * 1024))"`
+    );
+  }, (e) => {
+    assert.ok(e, 'maxBuffer should error');
+    assert.strictEqual(e.code, 'ENOBUFS');
+    assert.strictEqual(getSystemErrorName(e.errno), 'ENOBUFS');
+    return true;
+  });
+}
+
+// Default maxBuffer size is 1024 * 1024.
+{
+  const ret = execSync(
+    `"${process.execPath}" eval "console.log('a'.repeat(1024 * 1024 - 1))"`
+  );
+
+  assert.deepStrictEqual(
+    ret.toString().trim(),
+    'a'.repeat(1024 * 1024 - 1)
+  );
+}