fix: add tests for enums

tests/TimeSpanRecurrenceType.spec.ts

@@ -0,0 +1,25 @@
+import { TimeSpanRecurrenceType } from '../src/enums/TimeSpanRecurrenceType';
+import { expect } from 'chai';
+
+describe('TimeSpanRecurrenceType', function () {
+  describe('None', function () {
+    it('should return the correct value', function () {
+      const result = TimeSpanRecurrenceType.None;
+      expect(result).to.equal('None');
+    });
+  });
+
+  describe('EndByDate', function () {
+    it('should return the correct value', function () {
+      const result = TimeSpanRecurrenceType.EndByDate;
+      expect(result).to.equal('EndByDate');
+    });
+  });
+
+  describe('EndAfterOccurrences', function () {
+    it('should return the correct value', function () {
+      const result = TimeSpanRecurrenceType.EndAfterOccurrences;
+      expect(result).to.equal('EndAfterOccurrences');
+    });
+  });
+});