test(YouTube Node): Add tests for YouTube Node (#14459)

Co-authored-by: Roman Davydchuk <roman.davydchuk@n8n.io>

packages/nodes-base/test/nodes/FakeCredentialsMap.ts

@@ -213,6 +213,25 @@ BQIDAQAB
 			expires_in: 86400,
 		},
 	},
+	youTubeOAuth2Api: {
+		grantType: 'authorizationCode',
+		authUrl: 'https://accounts.google.com/o/oauth2/v2/auth',
+		accessTokenUrl: 'https://oauth2.googleapis.com/token',
+		clientId: 'CLIENTID',
+		clientSecret: 'CLIENTSECRET',
+		scope:
+			'https://www.googleapis.com/auth/youtube https://www.googleapis.com/auth/youtubepartner https://www.googleapis.com/auth/youtube.force-ssl https://www.googleapis.com/auth/youtube.upload https://www.googleapis.com/auth/youtubepartner-channel-audit',
+		authQueryParameters: 'access_type=offline&prompt=consent',
+		authentication: 'body',
+		oauthTokenData: {
+			access_token: 'ACCESSTOKEN',
+			refresh_token: 'REFRESHTOKEN',
+			scope:
+				'https://www.googleapis.com/auth/youtube https://www.googleapis.com/auth/youtubepartner https://www.googleapis.com/auth/youtube.force-ssl https://www.googleapis.com/auth/youtube.upload https://www.googleapis.com/auth/youtubepartner-channel-audit',
+			token_type: 'bearer',
+			expires_in: 86400,
+		},
+	},
 	notionApi: {
 		apiKey: 'key123',
 	},

packages/nodes-base/test/nodes/Helpers.ts

@@ -98,7 +98,7 @@ export const equalityTest = async (testData: WorkflowTestData) => {
 				}
 
 				// Convert errors to JSON so tests can compare
-				if (json.error instanceof Error) {
+				if (json?.error instanceof Error) {
 					json.error = JSON.parse(
 						JSON.stringify(json.error, ['message', 'name', 'description', 'context']),
 					);