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packages/nodes-base/nodes/Google/Calendar/test/addNextOccurrence.test.ts

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+import moment from 'moment-timezone';
+
+import type { RecurrentEvent } from '../GenericFunctions';
+import { addNextOccurrence } from '../GenericFunctions';
+
+const mockNow = '2024-09-06T16:30:00+03:00';
+jest.spyOn(global.Date, 'now').mockImplementation(() => moment(mockNow).valueOf());
+
+describe('addNextOccurrence', () => {
+	it('should not modify event if no recurrence exists', () => {
+		const event: RecurrentEvent[] = [
+			{
+				start: {
+					dateTime: '2024-09-01T08:00:00Z',
+					timeZone: 'UTC',
+				},
+				end: {
+					dateTime: '2024-09-01T09:00:00Z',
+					timeZone: 'UTC',
+				},
+				recurrence: [],
+			},
+		];
+
+		const result = addNextOccurrence(event);
+
+		expect(result[0].nextOccurrence).toBeUndefined();
+	});
+
+	it('should handle event with no RRULE correctly', () => {
+		const event: RecurrentEvent[] = [
+			{
+				start: {
+					dateTime: '2024-09-01T08:00:00Z',
+					timeZone: 'UTC',
+				},
+				end: {
+					dateTime: '2024-09-01T09:00:00Z',
+					timeZone: 'UTC',
+				},
+				recurrence: ['FREQ=WEEKLY;COUNT=2'],
+			},
+		];
+
+		const result = addNextOccurrence(event);
+
+		expect(result[0].nextOccurrence).toBeUndefined();
+	});
+
+	it('should ignore recurrence if until date is in the past', () => {
+		const event: RecurrentEvent[] = [
+			{
+				start: {
+					dateTime: '2024-08-01T08:00:00Z',
+					timeZone: 'UTC',
+				},
+				end: {
+					dateTime: '2024-08-01T09:00:00Z',
+					timeZone: 'UTC',
+				},
+				recurrence: ['RRULE:FREQ=DAILY;UNTIL=20240805T000000Z'],
+			},
+		];
+
+		const result = addNextOccurrence(event);
+
+		expect(result[0].nextOccurrence).toBeUndefined();
+	});
+
+	it('should handle errors gracefully without breaking and return unchanged event', () => {
+		const event: RecurrentEvent[] = [
+			{
+				start: {
+					dateTime: '2024-09-06T17:30:00+03:00',
+					timeZone: 'Europe/Berlin',
+				},
+				end: {
+					dateTime: '2024-09-06T18:00:00+03:00',
+					timeZone: 'Europe/Berlin',
+				},
+				recurrence: ['xxxxx'],
+			},
+		];
+
+		const result = addNextOccurrence(event);
+
+		expect(result).toEqual(event);
+	});
+});