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packages/nodes-base/nodes/Xero/test/Xero.node.test.ts

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+import { mock, mockDeep } from 'jest-mock-extended';
+import type { ILoadOptionsFunctions, INode } from 'n8n-workflow';
+
+import { Xero } from '../Xero.node';
+
+describe('Xero Node', () => {
+	describe('loadOptions', () => {
+		describe('getCurrencies', () => {
+			it('should return currencies with description as display name and code as value', async () => {
+				// Setup mock
+				const xero = new Xero();
+				const loadOptionsFunctions = mockDeep<ILoadOptionsFunctions>();
+
+				loadOptionsFunctions.getNode.mockReturnValue(mock<INode>());
+				loadOptionsFunctions.getCurrentNodeParameter.mockReturnValue('test-org-id');
+
+				// Mock Xero API response via requestOAuth2
+				loadOptionsFunctions.helpers.requestOAuth2.mockResolvedValue({
+					Currencies: [
+						{
+							Code: 'EUR',
+							Description: 'Euro',
+						},
+						{
+							Code: 'GBP',
+							Description: 'British Pound',
+						},
+						{
+							Code: 'USD',
+							Description: 'US Dollar',
+						},
+					],
+				});
+
+				// Call getCurrencies
+				const result = await xero.methods.loadOptions.getCurrencies.call(loadOptionsFunctions);
+
+				// Verify dropdown shows description but sends code
+				expect(result).toEqual([
+					{ name: 'Euro', value: 'EUR' },
+					{ name: 'British Pound', value: 'GBP' },
+					{ name: 'US Dollar', value: 'USD' },
+				]);
+
+				// Verify API was called correctly
+				expect(loadOptionsFunctions.helpers.requestOAuth2).toHaveBeenCalledWith(
+					'xeroOAuth2Api',
+					expect.objectContaining({
+						method: 'GET',
+						uri: 'https://api.xero.com/api.xro/2.0/Currencies',
+						headers: expect.objectContaining({
+							'Xero-tenant-id': 'test-org-id',
+						}),
+					}),
+				);
+			});
+
+			it('should handle empty currency list', async () => {
+				// Setup mock
+				const xero = new Xero();
+				const loadOptionsFunctions = mockDeep<ILoadOptionsFunctions>();
+
+				loadOptionsFunctions.getNode.mockReturnValue(mock<INode>());
+				loadOptionsFunctions.getCurrentNodeParameter.mockReturnValue('test-org-id');
+
+				// Mock empty response via requestOAuth2
+				loadOptionsFunctions.helpers.requestOAuth2.mockResolvedValue({
+					Currencies: [],
+				});
+
+				// Call getCurrencies
+				const result = await xero.methods.loadOptions.getCurrencies.call(loadOptionsFunctions);
+
+				// Verify returns empty array
+				expect(result).toEqual([]);
+			});
+		});
+	});
+});