1 files changed, 80 insertions, 0 deletions
diff --git a/tests/node_compat/test/parallel/test-stream-transform-split-highwatermark.js b/tests/node_compat/test/parallel/test-stream-transform-split-highwatermark.js
new file mode 100644
index 000000000..783ddfc91
--- /dev/null
+++ b/tests/node_compat/test/parallel/test-stream-transform-split-highwatermark.js
@@ -0,0 +1,80 @@
+// deno-fmt-ignore-file
+// deno-lint-ignore-file
+
+// Copyright Joyent and Node contributors. All rights reserved. MIT license.
+// Taken from Node 18.12.1
+// This file is automatically generated by `tools/node_compat/setup.ts`. Do not modify this file manually.
+
+'use strict';
+require('../common');
+const assert = require('assert');
+
+const { Transform, Readable, Writable } = require('stream');
+
+const DEFAULT = 16 * 1024;
+
+function testTransform(expectedReadableHwm, expectedWritableHwm, options) {
+  const t = new Transform(options);
+  assert.strictEqual(t._readableState.highWaterMark, expectedReadableHwm);
+  assert.strictEqual(t._writableState.highWaterMark, expectedWritableHwm);
+}
+
+// Test overriding defaultHwm
+testTransform(666, DEFAULT, { readableHighWaterMark: 666 });
+testTransform(DEFAULT, 777, { writableHighWaterMark: 777 });
+testTransform(666, 777, {
+  readableHighWaterMark: 666,
+  writableHighWaterMark: 777,
+});
+
+// Test highWaterMark overriding
+testTransform(555, 555, {
+  highWaterMark: 555,
+  readableHighWaterMark: 666,
+});
+testTransform(555, 555, {
+  highWaterMark: 555,
+  writableHighWaterMark: 777,
+});
+testTransform(555, 555, {
+  highWaterMark: 555,
+  readableHighWaterMark: 666,
+  writableHighWaterMark: 777,
+});
+
+// Test undefined, null
+[undefined, null].forEach((v) => {
+  testTransform(DEFAULT, DEFAULT, { readableHighWaterMark: v });
+  testTransform(DEFAULT, DEFAULT, { writableHighWaterMark: v });
+  testTransform(666, DEFAULT, { highWaterMark: v, readableHighWaterMark: 666 });
+  testTransform(DEFAULT, 777, { highWaterMark: v, writableHighWaterMark: 777 });
+});
+
+// test NaN
+{
+  assert.throws(() => {
+    new Transform({ readableHighWaterMark: NaN });
+  }, {
+    name: 'TypeError',
+    code: 'ERR_INVALID_ARG_VALUE',
+    message: "The property 'options.readableHighWaterMark' is invalid. " +
+      'Received NaN'
+  });
+
+  assert.throws(() => {
+    new Transform({ writableHighWaterMark: NaN });
+  }, {
+    name: 'TypeError',
+    code: 'ERR_INVALID_ARG_VALUE',
+    message: "The property 'options.writableHighWaterMark' is invalid. " +
+      'Received NaN'
+  });
+}
+
+// Test non Duplex streams ignore the options
+{
+  const r = new Readable({ readableHighWaterMark: 666 });
+  assert.strictEqual(r._readableState.highWaterMark, DEFAULT);
+  const w = new Writable({ writableHighWaterMark: 777 });
+  assert.strictEqual(w._writableState.highWaterMark, DEFAULT);
+}