test(open_api3.1): ensure that methods with non-explicit semantics al…

…low request body

test/openapi_3.1/get_with_request_body.spec.ts

@@ -0,0 +1,40 @@
+import * as request from 'supertest';
+import * as express from 'express';
+import { createApp } from "../common/app";
+import { join } from "path";
+
+describe('type null support - OpenAPI 3.1', () => {
+  let app;
+
+  before(async () => {
+    const apiSpec = join('test', 'openapi_3.1', 'resources', 'get_with_request_body.yaml');
+    app = await createApp(
+      { apiSpec, validateRequests: true, validateResponses: true },
+      3005,
+      (app) => app.use(
+        express
+          .Router()
+          .get(`/v1/entity`, (req, res) =>
+            res.status(200).json({
+              property: null
+            }),
+          ),
+      )
+    );
+  });
+
+  after(() => {
+    app.server.close();
+  });
+
+  // In OpenAPI 3.0, methods that RFC7231 does not have explicitly defined semantics for request body (GET, HEAD, DELETE) do not allow request body
+  // In OpenAPI 3.1, request body is allowed for these methods. This test ensures that it is correctly handled
+  it('should support an API with types set to null', async () => {
+    return request(app)
+      .get(`${app.basePath}/entity`)
+      .set('Content-Type', 'application/json')
+      .send({request: 123})
+      .expect(400);
+  });
+
+})

test/openapi_3.1/resources/get_with_request_body.yaml

@@ -0,0 +1,34 @@
+openapi: 3.1.0
+info:
+  title: API
+  version: 1.0.0
+servers:
+  - url: /v1
+paths:
+  /entity:
+    get:
+        summary: test
+        description: GETS my entity
+        requestBody:
+          description: Request body for entity
+          required: true
+          content:
+            application/json:
+              schema:
+                title: EntityRequest
+                type: object
+                properties:
+                  request:
+                    type: ['string']
+        responses:
+          '200':
+            description: OK
+            content:
+              application/json: 
+                schema:
+                  title: Entity
+                  type: object
+                  properties:
+                    property:
+                      type: ['string', 'null']
+