add oneOf test

test/one.of.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 () => {
+    const apiSpec = path.join('test', 'resources', 'one.of.yaml');
+    app = await createApp(
+      { apiSpec },
+      3005,
+      app => {
+        app.post(`${app.basePath}/one_of`, (req, res) => {
+          res.json(req.body);
+        });
+        app.use((err, req, res, next) => {
+          res.status(err.status || 500).json({
+            message: err.message,
+            code: err.status || 500,
+          });
+        });
+      },
+      false,
+    );
+  });
+
+  after(() => {
+    app.server.close();
+  });
+
+  it('should return 200 one first oneOf option', async () => {
+    return request(app)
+      .post(`${app.basePath}/one_of`)
+      .set('content-type', 'application/json')
+      .send({
+        id: 'some_id',
+        array_of_oneofs: [
+          {
+            type: 'type_1',
+            unique_one: 'unique_one',
+          },
+        ],
+      })
+      .expect(200);
+  });
+
+  it('should return 200 one second oneOf option', async () => {
+    return request(app)
+      .post(`${app.basePath}/one_of`)
+      .set('content-type', 'application/json')
+      .send({
+        id: 'some_id',
+        array_of_oneofs: [
+          {
+            type: 'type_2',
+            unique_two: 'unique_two',
+          },
+        ],
+      })
+      .expect(200);
+  });
+
+  it('should return 400 for invalid oneOf option', async () => {
+    return request(app)
+      .post(`${app.basePath}/one_of`)
+      .set('content-type', 'application/json')
+      .send({
+        id: 'some_id',
+        array_of_oneofs: [
+          {
+            type: 'type_2',
+            unique_three: 'unique_three',
+          },
+        ],
+      })
+      .expect(400)
+      .then(r => {
+        const e = r.body;
+        expect(e.message).to.contain(
+          'should match exactly one schema in oneOf',
+        );
+      });
+  });
+});

test/resources/one.of.yaml

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+openapi: "3.0.2"
+info:
+  version: 1.0.0
+  title: requestBodies $ref
+  description: requestBodies $ref Test
+
+servers:
+  - url: /v1
+
+paths:
+  /one_of:
+    post:
+      requestBody:
+        # $ref: "#/components/requestBodies/OneOfBody"
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/OneOfType"
+      responses:
+        "200":
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/OneOfType'
+        "400":
+          description: Bad Request
+
+components:
+  schemas:
+    SimilarTypeOne:
+      allOf:
+        - $ref: "#/components/schemas/SimilarSuperType"
+        - type: object
+          properties:
+            type:
+              type: string
+              enum:
+                - type_1
+            unique_one:
+              type: string
+          required:
+            - type
+            - unique_one
+
+    SimilarTypeTwo:
+      allOf:
+        - $ref: "#/components/schemas/SimilarSuperType"
+        - type: object
+          properties:
+            type:
+              type: string
+              enum:
+                - type_2
+            unique_two:
+              type: string
+          required:
+            - type
+            - unique_two
+
+    OneOfType:
+      type: object
+      properties:
+        array_of_oneofs:
+          type: array
+          items:
+            oneOf:
+              - $ref: "#/components/schemas/SimilarTypeOne"
+              - $ref: "#/components/schemas/SimilarTypeTwo"
+            discriminator:
+              propertyName: type
+
+    SimilarSuperType:
+      type: object
+      properties:
+        id:
+          type: string
+
+  # requestBodies:
+  #   OneOfBody:
+  #     required: true
+  #     content:
+  #       text/plain:
+  #         schema:
+  #           type: string
+  #       application/json:
+  #         schema:
+  #           $ref: "#/components/schemas/OneOfType"