feat: implement getFieldById method

tests/Field.spec.ts

@@ -0,0 +1,53 @@
+import { expect } from 'chai';
+import { Field } from '../src/models/Field';
+
+describe('Field', function () {
+  it('should be defined', function () {
+    expect(Field).to.not.be.undefined;
+  });
+
+  it('should have a constructor', function () {
+    expect(Field).to.have.property('constructor');
+  });
+
+  it('should have 7 parameters', function () {
+    expect(Field).to.have.lengthOf(7);
+  });
+
+  it('should create a new instance of the Field class', function () {
+    expect(
+      () => new Field(1, 1, 'Text Field', 'Text', 'Enabled', true, false)
+    ).to.not.throw();
+  });
+
+  it('should create a new instance of the Field class with the correct properties and values', function () {
+    const field = new Field(1, 1, 'Text Field', 'Text', 'Enabled', true, false);
+
+    expect(field).to.have.property('id');
+    expect(field).to.have.property('appId');
+    expect(field).to.have.property('name');
+    expect(field).to.have.property('type');
+    expect(field).to.have.property('status');
+    expect(field).to.have.property('isRequired');
+    expect(field).to.have.property('isUnique');
+    expect(field.id).to.equal(1);
+    expect(field.appId).to.equal(1);
+    expect(field.name).to.equal('Text Field');
+    expect(field.type).to.equal('Text');
+    expect(field.status).to.equal('Enabled');
+    expect(field.isRequired).to.equal(true);
+    expect(field.isUnique).to.equal(false);
+  });
+
+  it('should throw an error when the type parameter is not a valid value', function () {
+    expect(
+      () => new Field(1, 1, 'Text Field', 'Invalid', 'Enabled', true, false)
+    ).to.throw();
+  });
+
+  it('should throw an error when the status parameter is not a valid value', function () {
+    expect(
+      () => new Field(1, 1, 'Text Field', 'Text', 'Unabled', true, false)
+    ).to.throw();
+  });
+});