feat: Add test infrastructure, fix bugs, and improve code quality

credentials/CouchbaseApi.credentials.ts

@@ -1,4 +1,9 @@
-import { Icon, ICredentialType, INodeProperties } from 'n8n-workflow';
+import {
+	Icon,
+	ICredentialTestRequest,
+	ICredentialType,
+	INodeProperties,
+} from 'n8n-workflow';
 
 export class CouchbaseApi implements ICredentialType {
 	name = 'couchbaseApi';
@@ -15,12 +20,19 @@ export class CouchbaseApi implements ICredentialType {
 			name: 'couchbaseConnectionString',
 			type: 'string',
 			default: '',
+			placeholder: 'couchbase://localhost or couchbases://hostname',
+			description:
+				'The Couchbase connection string. Use couchbase:// for unencrypted or couchbases:// for TLS connections.',
+			required: true,
 		},
 		{
 			displayName: 'Username',
 			name: 'couchbaseUsername',
 			type: 'string',
 			default: '',
+			placeholder: 'Enter your Couchbase username',
+			description: 'The username for Couchbase authentication',
+			required: true,
 		},
 		{
 			displayName: 'Password',
@@ -30,6 +42,20 @@ export class CouchbaseApi implements ICredentialType {
 				password: true,
 			},
 			default: '',
+			placeholder: 'Enter your Couchbase password',
+			description: 'The password for Couchbase authentication',
+			required: true,
 		},
 	];
+
+	// Credential test to verify connection works
+	test: ICredentialTestRequest = {
+		request: {
+			// This triggers a connection test when saving credentials
+			// The actual test is performed in the node's connection logic
+			baseURL: '={{$credentials.couchbaseConnectionString}}',
+			url: '',
+			skipSslCertificateValidation: true,
+		},
+	};
 }