fix: add tests for enums

tests/FormulaOutputType.spec.ts

@@ -0,0 +1,32 @@
+import { FormulaOutputType } from '../src/enums/FormulaOutputType';
+import { expect } from 'chai';
+
+describe('FormulaOutputType', function () {
+  describe('Text', function () {
+    it('should return the correct value', function () {
+      const result = FormulaOutputType.Text;
+      expect(result).to.equal('Text');
+    });
+  });
+
+  describe('Numeric', function () {
+    it('should return the correct value', function () {
+      const result = FormulaOutputType.Numeric;
+      expect(result).to.equal('Numeric');
+    });
+  });
+
+  describe('DateAndTime', function () {
+    it('should return the correct value', function () {
+      const result = FormulaOutputType.DateAndTime;
+      expect(result).to.equal('DateAndTime');
+    });
+  });
+
+  describe('ListValue', function () {
+    it('should return the correct value', function () {
+      const result = FormulaOutputType.ListValue;
+      expect(result).to.equal('ListValue');
+    });
+  });
+});