1 files changed, 77 insertions, 0 deletions
diff --git a/tests/node_compat/test/parallel/test-event-emitter-once.js b/tests/node_compat/test/parallel/test-event-emitter-once.js
new file mode 100644
index 000000000..1d02a639e
--- /dev/null
+++ b/tests/node_compat/test/parallel/test-event-emitter-once.js
@@ -0,0 +1,77 @@
+// 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.
+
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const EventEmitter = require('events');
+
+const e = new EventEmitter();
+
+e.once('hello', common.mustCall());
+
+e.emit('hello', 'a', 'b');
+e.emit('hello', 'a', 'b');
+e.emit('hello', 'a', 'b');
+e.emit('hello', 'a', 'b');
+
+function remove() {
+  assert.fail('once->foo should not be emitted');
+}
+
+e.once('foo', remove);
+e.removeListener('foo', remove);
+e.emit('foo');
+
+e.once('e', common.mustCall(function() {
+  e.emit('e');
+}));
+
+e.once('e', common.mustCall());
+
+e.emit('e');
+
+{
+  // once() has different code paths based on the number of arguments being
+  // emitted. Verify that all of the cases are covered.
+  const maxArgs = 4;
+
+  for (let i = 0; i <= maxArgs; ++i) {
+    const ee = new EventEmitter();
+    const args = ['foo'];
+
+    for (let j = 0; j < i; ++j)
+      args.push(j);
+
+    ee.once('foo', common.mustCall((...params) => {
+      assert.deepStrictEqual(params, args.slice(1));
+    }));
+
+    EventEmitter.prototype.emit.apply(ee, args);
+  }
+}