Adds response model with appropriate tests

src/models/response.test.ts

@@ -0,0 +1,21 @@
+import Response from './response';
+
+it('will set the question identifier and response value', async () => {
+  const response = new Response();
+
+  expect(response.for(1).is('the response')).toHaveProperty('attributes', {
+    option: null,
+    question: 1,
+    value: 'the response',
+  });
+});
+
+it('will set the question identifier and response option', async () => {
+  const response = new Response();
+
+  expect(response.for(1).selected(2)).toHaveProperty('attributes', {
+    option: 2,
+    question: 1,
+    value: null,
+  });
+});

src/models/response.ts

@@ -0,0 +1,61 @@
+import { ModelInterface } from '../index';
+import Model from './model';
+
+export interface ResponseModel extends ModelInterface {
+  for(question: number): this;
+
+  is(value: string): this;
+
+  selected(option: number): this;
+
+  transform(): object;
+}
+
+export interface ResponseParameters {
+  option: number | null;
+  question: number | null;
+  value: string | null;
+}
+
+export default class Response extends Model implements ResponseModel {
+  protected attributes: ResponseParameters;
+
+  constructor() {
+    super();
+
+    this.attributes = {
+      option: null,
+      question: null,
+      value: null,
+    };
+  }
+
+  public for(question: number): this {
+    this.attributes.question = question;
+
+    return this;
+  }
+
+  public is(value: string): this {
+    this.attributes.value = value;
+
+    return this;
+  }
+
+  public selected(option: number): this {
+    this.attributes.option = option;
+
+    return this;
+  }
+
+  public transform(): object {
+    return {
+      attributes: {
+        form_option_id: this.attributes.option,
+        form_question_id: this.attributes.question,
+        value: this.attributes.value,
+      },
+      type: 'responses',
+    };
+  }
+}