create tests for read only support

test/read.only.spec.ts

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+import * as path from 'path';
+import * as express from 'express';
+import { expect } from 'chai';
+import * as request from 'supertest';
+import { createApp } from './common/app';
+
+const packageJson = require('../package.json');
+
+describe.only(packageJson.name, () => {
+  let app = null;
+
+  before(async () => {
+    // Set up the express app
+    const apiSpec = path.join('test', 'resources', 'read.only.yaml');
+    app = await createApp({ apiSpec, validateResponses: true }, 3005, app =>
+      app
+        .post(`${app.basePath}/products`, (req, res) => res.json(req.body))
+        .get(`${app.basePath}/products`, (req, res) =>
+          res.json([
+            {
+              id: 'id_1',
+              name: 'name_1',
+              price: 9.99,
+              created_at: new Date().toISOString(),
+            },
+          ]),
+        ),
+    );
+  });
+
+  after(() => {
+    app.server.close();
+  });
+
+  it('should not allow read only properties in requests', async () =>
+    request(app)
+      .get(`${app.basePath}/products`)
+      .query({
+        id: 'id_1',
+        name: 'some name',
+        price: 10.99,
+        created_at: new Date().toUTCString(),
+      })
+      .expect(400)
+      .then(r => {
+        const body = r.body;
+      }));
+
+  it('should allow read only properties in responses', async () =>
+    request(app)
+      .get(`${app.basePath}/products`)
+      .expect(200)
+      .then(r => {
+        expect(r.body)
+          .to.be.an('array')
+          .with.length(1);
+      }));
+});

test/resources/read.only.yaml

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+openapi: '3.0.0'
+info:
+  version: 1.0.0
+  title: Swagger Petstore
+  description: A sample API
+  termsOfService: http://swagger.io/terms/
+  license:
+    name: Apache 2.0
+    url: https://www.apache.org/licenses/LICENSE-2.0.html
+servers:
+  - url: http://petstore.swagger.io/v1
+
+paths:
+  /products:
+    get:
+      description: get products
+      operationId: getProducts
+      responses:
+        '200':
+          description: pet response
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: '#/components/schemas/Product'
+
+    post:
+      description: create products
+      operationId: createProducts
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/Product'
+      responses:
+        '200':
+          description: pet response
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: '#/components/schemas/Product'
+
+components:
+  schemas:
+    Product:
+      type: object
+      properties:
+        id:
+          type: string
+          readOnly: true
+        name:
+          type: string
+        price:
+          type: number
+        created_at:
+          type: string
+          format: date-time
+          readOnly: true