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53 lines
1.5 KiB
JavaScript
53 lines
1.5 KiB
JavaScript
// deno-fmt-ignore-file
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// deno-lint-ignore-file
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// Copyright Joyent and Node contributors. All rights reserved. MIT license.
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// Taken from Node 18.12.1
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// This file is automatically generated by `tools/node_compat/setup.ts`. Do not modify this file manually.
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'use strict';
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const common = require('../common');
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const dc = require('diagnostics_channel');
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const assert = require('assert');
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const { Channel } = dc;
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const input = {
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foo: 'bar'
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};
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// Should not have named channel
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assert.ok(!dc.hasSubscribers('test'));
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// Individual channel objects can be created to avoid future lookups
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const channel = dc.channel('test');
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assert.ok(channel instanceof Channel);
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// No subscribers yet, should not publish
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assert.ok(!channel.hasSubscribers);
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const subscriber = common.mustCall((message, name) => {
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assert.strictEqual(name, channel.name);
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assert.deepStrictEqual(message, input);
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});
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// Now there's a subscriber, should publish
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channel.subscribe(subscriber);
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assert.ok(channel.hasSubscribers);
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// The ActiveChannel prototype swap should not fail instanceof
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assert.ok(channel instanceof Channel);
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// Should trigger the subscriber once
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channel.publish(input);
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// Should not publish after subscriber is unsubscribed
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assert.ok(channel.unsubscribe(subscriber));
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assert.ok(!channel.hasSubscribers);
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// unsubscribe() should return false when subscriber is not found
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assert.ok(!channel.unsubscribe(subscriber));
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assert.throws(() => {
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channel.subscribe(null);
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}, { code: 'ERR_INVALID_ARG_TYPE' });
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