fix: implement formula field, list field, and reference field as chilrden of the field class. fix: when converting api response data to appropriate field response make sure json field objects are converted to correct field class based upon type.

tests/ListValue.spec.ts

@@ -0,0 +1,46 @@
+import { ListValue } from '../src/models/ListValue';
+import { expect } from 'chai';
+
+describe('ListValue', function () {
+  it('should be defined', function () {
+    expect(ListValue).to.not.be.undefined;
+  });
+
+  it('should be a function', function () {
+    expect(ListValue).to.be.a('function');
+  });
+
+  it('should have a constructor', function () {
+    expect(ListValue).to.have.property('constructor');
+  });
+
+  it('should create a new ListValue', function () {
+    const listValue = new ListValue('1', 'List Value', 1, 1, 'red');
+    expect(listValue).to.be.an.instanceOf(ListValue);
+  });
+
+  it('should have an id property', function () {
+    const listValue = new ListValue('1', 'List Value', 1, 1, 'red');
+    expect(listValue).to.have.property('id');
+  });
+
+  it('should have a name property', function () {
+    const listValue = new ListValue('1', 'List Value', 1, 1, 'red');
+    expect(listValue).to.have.property('name');
+  });
+
+  it('should have a sortOrder property', function () {
+    const listValue = new ListValue('1', 'List Value', 1, 1, 'red');
+    expect(listValue).to.have.property('sortOrder');
+  });
+
+  it('should have a numericValue property', function () {
+    const listValue = new ListValue('1', 'List Value', 1, 1, 'red');
+    expect(listValue).to.have.property('numericValue');
+  });
+
+  it('should have a color property', function () {
+    const listValue = new ListValue('1', 'List Value', 1, 1, 'red');
+    expect(listValue).to.have.property('color');
+  });
+});