test: improve code coverage of diagnostics_channel

test: improve code coverage of diagnostics_channel
PR-URL: #50053
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>

Author: MrJithil

test/parallel/test-diagnostics-channel-tracing-channel-args-types.js

@@ -0,0 +1,39 @@
+'use strict';
+
+require('../common');
+constdc=require('diagnostics_channel');
+constassert=require('assert');
+
+letchannel;
+
+// tracingChannel creating with name
+channel=dc.tracingChannel('test');
+assert.strictEqual(channel.start.name,'tracing:test:start');
+
+// tracingChannel creating with channels
+channel=dc.tracingChannel({
+start: dc.channel('tracing:test:start'),
+end: dc.channel('tracing:test:end'),
+asyncStart: dc.channel('tracing:test:asyncStart'),
+asyncEnd: dc.channel('tracing:test:asyncEnd'),
+error: dc.channel('tracing:test:error'),
+});
+
+// tracingChannel creating without nameOrChannels must throw TypeError
+assert.throws(()=>(channel=dc.tracingChannel(0)),{
+code: 'ERR_INVALID_ARG_TYPE',
+name: 'TypeError',
+message:
+/The"nameOrChannels"argumentmustbeoftypestringoraninstanceofChannelorObject/,
+});
+
+// tracingChannel creating without instance of Channel must throw error
+assert.throws(()=>(channel=dc.tracingChannel({start: ''})),{
+code: 'ERR_INVALID_ARG_TYPE',
+message: /The"nameOrChannels\.start"propertymustbeaninstanceofChannel/,
+});
+
+// tracingChannel creating with empty nameOrChannels must throw error
+assert.throws(()=>(channel=dc.tracingChannel({})),{
+message: /Cannotconvertundefinedornulltoobject/,
+});