1 files changed, 51 insertions, 0 deletions
diff --git a/tests/node_compat/test/parallel/test-diagnostics-channel-pub-sub.js b/tests/node_compat/test/parallel/test-diagnostics-channel-pub-sub.js
new file mode 100644
index 000000000..378cf051e
--- /dev/null
+++ b/tests/node_compat/test/parallel/test-diagnostics-channel-pub-sub.js
@@ -0,0 +1,51 @@
+// 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');
+const dc = require('diagnostics_channel');
+const assert = require('assert');
+const { Channel } = dc;
+
+const name = 'test';
+const input = {
+  foo: 'bar'
+};
+
+// Individual channel objects can be created to avoid future lookups
+const channel = dc.channel(name);
+assert.ok(channel instanceof Channel);
+
+// No subscribers yet, should not publish
+assert.ok(!channel.hasSubscribers);
+
+const subscriber = common.mustCall((message, name) => {
+  assert.strictEqual(name, channel.name);
+  assert.deepStrictEqual(message, input);
+});
+
+// Now there's a subscriber, should publish
+dc.subscribe(name, subscriber);
+assert.ok(channel.hasSubscribers);
+
+// The ActiveChannel prototype swap should not fail instanceof
+assert.ok(channel instanceof Channel);
+
+// Should trigger the subscriber once
+channel.publish(input);
+
+// Should not publish after subscriber is unsubscribed
+assert.ok(dc.unsubscribe(name, subscriber));
+assert.ok(!channel.hasSubscribers);
+
+// unsubscribe() should return false when subscriber is not found
+assert.ok(!dc.unsubscribe(name, subscriber));
+
+assert.throws(() => {
+  dc.subscribe(name, null);
+}, { code: 'ERR_INVALID_ARG_TYPE' });