fix(Mailjet Trigger Node): Fix issue that node could not get activated (#3281)

* 🔨 fix and clean up

* ⚡ Improvements

Co-authored-by: ricardo <ricardoespinoza105@gmail.com>

packages/nodes-base/nodes/Mailjet/Mailjet.node.ts

@@ -3,12 +3,8 @@ import {
 } from 'n8n-core';
 
 import {
-	ICredentialDataDecryptedObject,
-	ICredentialsDecrypted,
-	ICredentialTestFunctions,
 	IDataObject,
 	ILoadOptionsFunctions,
-	INodeCredentialTestResult,
 	INodeExecutionData,
 	INodePropertyOptions,
 	INodeType,
@@ -20,7 +16,6 @@ import {
 import {
 	IMessage,
 	mailjetApiRequest,
-	validateCredentials,
 	validateJSON,
 } from './GenericFunctions';
 
@@ -51,7 +46,6 @@ export class Mailjet implements INodeType {
 			{
 				name: 'mailjetEmailApi',
 				required: true,
-				testedBy: 'mailjetEmailApiTest',
 				displayOptions: {
 					show: {
 						resource: [
@@ -77,6 +71,7 @@ export class Mailjet implements INodeType {
 				displayName: 'Resource',
 				name: 'resource',
 				type: 'options',
+				noDataExpression: true,
 				options: [
 					{
 						name: 'Email',
@@ -88,7 +83,7 @@ export class Mailjet implements INodeType {
 					},
 				],
 				default: 'email',
-				description: 'Resource to consume.',
+				description: 'Resource to consume',
 			},
 			...emailOperations,
 			...emailFields,
@@ -98,25 +93,6 @@ export class Mailjet implements INodeType {
 	};
 
 	methods = {
-		credentialTest: {
-			async mailjetEmailApiTest(this: ICredentialTestFunctions, credential: ICredentialsDecrypted): Promise<INodeCredentialTestResult> {
-				try {
-					await validateCredentials.call(this, credential.data as ICredentialDataDecryptedObject);
-				} catch (error) {
-					const err = error as JsonObject;
-					if (err.statusCode === 401) {
-						return {
-							status: 'Error',
-							message: `Invalid credentials`,
-						};
-					}
-				}
-				return {
-					status: 'OK',
-					message: 'Authentication successful',
-				};
-			},
-		},
 		loadOptions: {
 			// Get all the available custom fields to display them to user so that he can
 			// select them easily
@@ -273,7 +249,7 @@ export class Mailjet implements INodeType {
 								body.Variables![variable.name as string] = variable.value;
 							}
 						}
-						
+
 						if (additionalFields.bccEmail) {
 							const bccEmail = (additionalFields.bccEmail as string).split(',') as string[];
 							for (const email of bccEmail) {