chore(): minor tweaks

e2e/express.e2e-spec.ts

@@ -1,11 +1,12 @@
 import { NestFactory } from '@nestjs/core';
-import * as SwaggerParser from 'swagger-parser';
-import { DocumentBuilder, SwaggerModule } from '../lib';
-import { ApplicationModule } from './src/app.module';
 import {
   ExpressAdapter,
   NestExpressApplication
 } from '@nestjs/platform-express';
+import * as request from 'supertest';
+import * as SwaggerParser from 'swagger-parser';
+import { DocumentBuilder, SwaggerModule } from '../lib';
+import { ApplicationModule } from './src/app.module';
 
 describe('Express Swagger', () => {
   let app: NestExpressApplication;
@@ -66,5 +67,33 @@ describe('Express Swagger', () => {
 
     await app.init();
     expect(app.getHttpAdapter().getInstance()).toBeDefined();
+    await app.close();
+  });
+
+  describe('served swagger ui', () => {
+    const SWAGGER_RELATIVE_URL = '/apidoc';
+
+    beforeEach(async () => {
+      const swaggerDocument = SwaggerModule.createDocument(
+        app,
+        builder.build()
+      );
+      SwaggerModule.setup(SWAGGER_RELATIVE_URL, app, swaggerDocument);
+
+      await app.init();
+    });
+
+    afterEach(async () => {
+      await app.close();
+    });
+
+    it('content type of served json document should be valid', async () => {
+      const response = await request(app.getHttpServer()).get(
+        `${SWAGGER_RELATIVE_URL}-json`
+      );
+
+      expect(response.status).toEqual(200);
+      expect(Object.keys(response.body).length).toBeGreaterThan(0);
+    });
   });
 });

e2e/fastify.e2e-spec.ts

@@ -3,6 +3,7 @@ import {
   FastifyAdapter,
   NestFastifyApplication
 } from '@nestjs/platform-fastify';
+import * as request from 'supertest';
 import * as SwaggerParser from 'swagger-parser';
 import { DocumentBuilder, SwaggerModule } from '../lib';
 import { ApplicationModule } from './src/app.module';
@@ -70,4 +71,32 @@ describe('Fastify Swagger', () => {
       app.getHttpAdapter().getInstance().ready()
     ).resolves.toBeDefined();
   });
+
+  describe('served swagger ui', () => {
+    const SWAGGER_RELATIVE_URL = '/apidoc';
+
+    beforeEach(async () => {
+      const swaggerDocument = SwaggerModule.createDocument(
+        app,
+        builder.build()
+      );
+      SwaggerModule.setup(SWAGGER_RELATIVE_URL, app, swaggerDocument);
+
+      await app.init();
+      await app.getHttpAdapter().getInstance().ready();
+    });
+
+    afterEach(async () => {
+      await app.close();
+    });
+
+    it('content type of served json document should be valid', async () => {
+      const response = await request(app.getHttpServer()).get(
+        `${SWAGGER_RELATIVE_URL}-json`
+      );
+
+      expect(response.status).toEqual(200);
+      expect(Object.keys(response.body).length).toBeGreaterThan(0);
+    });
+  });
 });

lib/swagger-module.ts

@@ -83,7 +83,7 @@ export class SwaggerModule {
     });
 
     httpAdapter.get(`${finalPath}-json`, (req, res) => {
-      res.type('text/json');
+      res.type('application/json');
       res.send(jsonDocument);
     });
 

package.json

@@ -57,6 +57,7 @@
     "prettier": "2.7.1",
     "reflect-metadata": "0.1.13",
     "release-it": "15.1.1",
+    "supertest": "^6.2.4",
     "swagger-parser": "10.0.3",
     "ts-jest": "28.0.5",
     "typescript": "4.7.4"