⚡ Make it possible to set credentials to fixed values

packages/core/test/Helpers.ts

@@ -2,6 +2,7 @@ import { set } from 'lodash';
 
 import {
 	ICredentialDataDecryptedObject,
+	ICredentialsHelper,
 	IExecuteWorkflowInfo,
 	INodeExecutionData,
 	INodeParameters,
@@ -16,11 +17,25 @@ import {
 } from 'n8n-workflow';
 
 import {
+	Credentials,
 	IDeferredPromise,
 	IExecuteFunctions,
 } from '../src';
 
 
+export class CredentialsHelper extends ICredentialsHelper {
+	getDecrypted(name: string, type: string): ICredentialDataDecryptedObject {
+		return {};
+	}
+
+	getCredentials(name: string, type: string): Credentials {
+		return new Credentials('', '', [], '');
+	}
+
+	async updateCredentials(name: string, type: string, data: ICredentialDataDecryptedObject): Promise<void> {}
+}
+
+
 class NodeTypesClass implements INodeTypes {
 
 	nodeTypes: INodeTypeData = {
@@ -276,12 +291,12 @@ export function WorkflowExecuteAdditionalData(waitPromise: IDeferredPromise<IRun
 
 	return {
 		credentials: {},
+		credentialsHelper: new CredentialsHelper({}, ''),
 		hooks: new WorkflowHooks(hookFunctions, 'trigger', '1', workflowData),
 		executeWorkflow: async (workflowInfo: IExecuteWorkflowInfo): Promise<any> => {}, // tslint:disable-line:no-any
 		restApiUrl: '',
 		encryptionKey: 'test',
 		timezone: 'America/New_York',
-		updateCredentials: async (name: string, type: string, data: ICredentialDataDecryptedObject, encryptionKey: string): Promise<void> => {},
 		webhookBaseUrl: 'webhook',
 		webhookTestBaseUrl: 'webhook-test',
 	};