test: add circular test

test/circular.spec.ts

@@ -0,0 +1,42 @@
+import * as path from 'path';
+import * as express from 'express';
+import { expect } from 'chai';
+import * as request from 'supertest';
+import { createApp } from './common/app';
+import * as packageJson from '../package.json';
+
+describe(packageJson.name, () => {
+  let app = null;
+
+  before(async () => {
+    // Set up the express app
+    const apiSpec = path.join('test', 'resources', 'circular.yaml');
+    app = await createApp({ apiSpec }, 3005, (app) =>
+      app.use(
+        `${app.basePath}`,
+        express.Router().post(`/circular`, (req, res) => res.json(req.body)),
+      ),
+    );
+  });
+
+  after(() => {
+    app.server.close();
+  });
+
+  it('should validate circular ref successfully', async () =>
+    request(app)
+      .post(`${app.basePath}/circular`)
+      .send({
+        id: 1,
+        name: 'dad',
+        favorite: {
+          id: 1,
+          name: 'dad',
+        },
+        children: [
+          { id: 2, name: 'tyler' },
+          { id: 3, name: 'taylor' },
+        ],
+      })
+      .expect(200));
+});

test/resources/circular.yaml

@@ -0,0 +1,40 @@
+openapi: '3.0.3'
+info:
+  version: 1.0.0
+  title: Swagger
+servers:
+  - url: /v1
+paths:
+  /circular:
+    post:
+      description: creates user
+      requestBody:
+        description: creates user
+        required: true
+        content:
+          application/json:
+            schema:
+             $ref: '#/components/schemas/User'
+      responses:
+        '200':
+          description: Updated
+
+components:
+  schemas:
+    User:
+      type: object
+      required:
+        - id
+      properties:
+        id:
+          type: number
+        name:
+          type: string
+        favorite: 
+          $ref: '#/components/schemas/User'
+        children:
+          type: array
+          items:
+            $ref: '#/components/schemas/User'
+
+