feat(Google Sheets Node): Overhaul of node

packages/nodes-base/nodes/Google/Sheet/v2/methods/credentialTest.ts

@@ -0,0 +1,35 @@
+import {
+	ICredentialsDecrypted,
+	ICredentialTestFunctions,
+	INodeCredentialTestResult,
+} from 'n8n-workflow';
+
+import { getAccessToken, IGoogleAuthCredentials } from '../transport';
+
+export async function googleApiCredentialTest(
+	this: ICredentialTestFunctions,
+	credential: ICredentialsDecrypted,
+): Promise<INodeCredentialTestResult> {
+	try {
+		const tokenRequest = await getAccessToken.call(
+			this,
+			credential.data! as unknown as IGoogleAuthCredentials,
+		);
+		if (!tokenRequest.access_token) {
+			return {
+				status: 'Error',
+				message: 'Could not generate a token from your private key.',
+			};
+		}
+	} catch (err) {
+		return {
+			status: 'Error',
+			message: `Private key validation failed: ${err.message}`,
+		};
+	}
+
+	return {
+		status: 'OK',
+		message: 'Connection successful!',
+	};
+}