1 files changed, 37 insertions, 0 deletions
diff --git a/tests/node_compat/test/parallel/test-stream-readable-hwm-0.js b/tests/node_compat/test/parallel/test-stream-readable-hwm-0.js
new file mode 100644
index 000000000..cfbfac8ab
--- /dev/null
+++ b/tests/node_compat/test/parallel/test-stream-readable-hwm-0.js
@@ -0,0 +1,37 @@
+// 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';
+
+const common = require('../common');
+
+// This test ensures that Readable stream will call _read() for streams
+// with highWaterMark === 0 upon .read(0) instead of just trying to
+// emit 'readable' event.
+
+const assert = require('assert');
+const { Readable } = require('stream');
+
+const r = new Readable({
+  // Must be called only once upon setting 'readable' listener
+  read: common.mustCall(),
+  highWaterMark: 0,
+});
+
+let pushedNull = false;
+// This will trigger read(0) but must only be called after push(null)
+// because the we haven't pushed any data
+r.on('readable', common.mustCall(() => {
+  assert.strictEqual(r.read(), null);
+  assert.strictEqual(pushedNull, true);
+}));
+r.on('end', common.mustCall());
+process.nextTick(() => {
+  assert.strictEqual(r.read(), null);
+  pushedNull = true;
+  r.push(null);
+});