diff --git a/gridsome/lib/develop.js b/gridsome/lib/develop.js
index 5b3cf414e..af2b96a49 100644
--- a/gridsome/lib/develop.js
+++ b/gridsome/lib/develop.js
@@ -22,8 +22,6 @@ module.exports = async (context, args) => {
   const urls = prepareUrls(hostname, port)
   const server = new Server(app, urls)
 
-  await app.plugins.configureServer(server)
-
   await fs.emptyDir(app.config.cacheDir)
 
   const webpackConfig = await createWebpackConfig(app)
diff --git a/gridsome/lib/serve.js b/gridsome/lib/serve.js
index 7ab28f0cb..91345a850 100644
--- a/gridsome/lib/serve.js
+++ b/gridsome/lib/serve.js
@@ -22,7 +22,6 @@ module.exports = async (context, args) => {
   const { config } = app
 
   await app.plugins.run('beforeServe', { context, config })
-  await app.plugins.configureServer(server)
 
   await fs.ensureDir(config.cacheDir)
   await fs.emptyDir(config.outDir)
diff --git a/gridsome/lib/server/Server.js b/gridsome/lib/server/Server.js
index 908661081..e4143832e 100644
--- a/gridsome/lib/server/Server.js
+++ b/gridsome/lib/server/Server.js
@@ -19,7 +19,7 @@ class Server {
     }
   }
 
-  createExpressApp() {
+  async createExpressApp() {
     const isDev = process.env.NODE_ENV === 'development'
     const app = express()
 
@@ -79,7 +79,12 @@ class Server {
     const assetsPath = forwardSlash(path.join(this._app.config.pathPrefix, assetsDir))
     const assetsRE = new RegExp(`${assetsPath}/(files|static)/(.*)`)
 
-    app.get(assetsRE, assetsMiddleware(this._app))
+    if (!process.env.GRIDSOME_TEST) {
+      app.get(assetsRE, assetsMiddleware(this._app))
+    }
+
+    await this._app.plugins.configureServer(app)
+
     app.use(historyApiFallback())
 
     this.hooks.afterSetup.call(app)
@@ -88,7 +93,7 @@ class Server {
   }
 
   async listen(port, hostname, callback) {
-    const app = this.createExpressApp()
+    const app = await this.createExpressApp()
     const server = http.createServer(app)
 
     if (process.env.NODE_ENV === 'development') {
diff --git a/gridsome/lib/server/__tests__/Server.spec.js b/gridsome/lib/server/__tests__/Server.spec.js
new file mode 100644
index 000000000..f503da7b6
--- /dev/null
+++ b/gridsome/lib/server/__tests__/Server.spec.js
@@ -0,0 +1,30 @@
+const Server = require('../Server')
+const App = require('../../app/App')
+const request = require('supertest')
+const { prepareUrls } = require('../utils')
+const { BOOTSTRAP_CONFIG } = require('../../utils/constants')
+
+test('api.configureServer()', async () => {
+  const urls = prepareUrls('localhost', 8080)
+  const callback = jest.fn((req, res) => res.send('Hello, world!'))
+  const gridsome = await createApp(function (api) {
+    api.configureServer(app => {
+      app.get('/my-endpoint', callback)
+    })
+  })
+
+  const server = new Server(gridsome, urls)
+  const app = await server.createExpressApp()
+  const res = await request(app).get('/my-endpoint')
+
+  expect(res.text).toEqual('Hello, world!')
+  expect(callback.mock.calls).toHaveLength(1)
+})
+
+async function createApp(plugin) {
+  const app = await new App(__dirname, {
+    localConfig: { plugins: plugin ? [plugin] : [] }
+  })
+
+  return app.bootstrap(BOOTSTRAP_CONFIG)
+}
diff --git a/package.json b/package.json
index 0c53bcf43..1f91b8b4f 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,8 @@
     "lerna": "^3.4.0",
     "memfs": "^2.9.4",
     "minimist": "^1.2.0",
-    "puppeteer": "^1.12.2"
+    "puppeteer": "^1.12.2",
+    "supertest": "^4.0.2"
   },
   "engines": {
     "node": ">=8.3",
diff --git a/yarn.lock b/yarn.lock
index a104304fa..8f83c2af8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4166,7 +4166,7 @@ cookie@0.4.0:
   resolved "https://registry.yarnpkg.com/cookie/-/cookie-0.4.0.tgz#beb437e7022b3b6d49019d088665303ebe9c14ba"
   integrity sha512-+Hp8fLp57wnUSt0tY0tHEXh4voZRDnoIrZPqlo3DPiI4y9lwg/jqx+1Om94/W6ZaPDOUbnjOt/99w66zk+l1Xg==
 
-cookiejar@^2.1.2:
+cookiejar@^2.1.0, cookiejar@^2.1.2:
   version "2.1.2"
   resolved "https://registry.yarnpkg.com/cookiejar/-/cookiejar-2.1.2.tgz#dd8a235530752f988f9a0844f3fc589e3111125c"
   integrity sha512-Mw+adcfzPxcPeI+0WlvRrr/3lGVO0bD75SxX6811cxSh1Wbxx7xZBGK1eVtDf6si8rg2lhnUjsVLMFMfbRIuwA==
@@ -6121,7 +6121,7 @@ forever-agent@~0.6.1:
   resolved "https://registry.yarnpkg.com/forever-agent/-/forever-agent-0.6.1.tgz#fbc71f0c41adeb37f96c577ad1ed42d8fdacca91"
   integrity sha1-+8cfDEGt6zf5bFd60e1C2P2sypE=
 
-form-data@^2.3.3:
+form-data@^2.3.1, form-data@^2.3.3:
   version "2.5.1"
   resolved "https://registry.yarnpkg.com/form-data/-/form-data-2.5.1.tgz#f2cbec57b5e59e23716e128fe44d4e5dd23895f4"
   integrity sha512-m21N3WOmEEURgk6B9GLOE4RuWOFf28Lhh9qGYeNlGq4VDXUlJy2th2slBNU8Gp8EzloYZOibZJ7t5ecIrFSjVA==
@@ -9203,7 +9203,7 @@ merge2@^1.2.3:
   resolved "https://registry.yarnpkg.com/merge2/-/merge2-1.2.4.tgz#c9269589e6885a60cf80605d9522d4b67ca646e3"
   integrity sha512-FYE8xI+6pjFOhokZu0We3S5NKCirLbCzSh2Usf3qEyr4X8U+0jNg9P8RZ4qz+V2UoECLVwSyzU3LxXBaLGtD3A==
 
-methods@^1.1.1, methods@~1.1.2:
+methods@^1.1.1, methods@^1.1.2, methods@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/methods/-/methods-1.1.2.tgz#5529a4d67654134edcc5266656835b0f851afcee"
   integrity sha1-VSmk1nZUE07cxSZmVoNbD4Ua/O4=
@@ -9252,7 +9252,7 @@ mime-types@^2.1.12, mime-types@^2.1.21, mime-types@^2.1.24, mime-types@~2.1.19,
   dependencies:
     mime-db "1.40.0"
 
-mime@1.6.0:
+mime@1.6.0, mime@^1.4.1:
   version "1.6.0"
   resolved "https://registry.yarnpkg.com/mime/-/mime-1.6.0.tgz#32cd9e5c64553bd58d19a568af452acff04981b1"
   integrity sha512-x0Vn8spI+wuJ1O6S7gnbaQg8Pxh4NNHb7KSINmEWKiPE4RKOplvijn+NkmYmmRgP68mc70j2EbeTFRsrswaQeg==
@@ -11307,7 +11307,7 @@ qs@6.7.0:
   resolved "https://registry.yarnpkg.com/qs/-/qs-6.7.0.tgz#41dc1a015e3d581f1621776be31afb2876a9b1bc"
   integrity sha512-VCdBRNFTX1fyE7Nb6FYoURo/SPe62QCaAyzJvUjwRaIsc+NePBEniHlvxFmmX56+HZphIGtV0XeCirBtpDrTyQ==
 
-qs@^6.5.2, qs@^6.6.0:
+qs@^6.5.1, qs@^6.5.2, qs@^6.6.0:
   version "6.8.0"
   resolved "https://registry.yarnpkg.com/qs/-/qs-6.8.0.tgz#87b763f0d37ca54200334cd57bb2ef8f68a1d081"
   integrity sha512-tPSkj8y92PfZVbinY1n84i1Qdx75lZjMQYx9WZhnkofyxzw2r7Ho39G3/aEvSUdebxpnnM4LZJCtvE/Aq3+s9w==
@@ -12813,6 +12813,22 @@ stylehacks@^4.0.0:
     postcss "^7.0.0"
     postcss-selector-parser "^3.0.0"
 
+superagent@^3.8.3:
+  version "3.8.3"
+  resolved "https://registry.yarnpkg.com/superagent/-/superagent-3.8.3.tgz#460ea0dbdb7d5b11bc4f78deba565f86a178e128"
+  integrity sha512-GLQtLMCoEIK4eDv6OGtkOoSMt3D+oq0y3dsxMuYuDvaNUvuT8eFBuLmfR0iYYzHC1e8hpzC6ZsxbuP6DIalMFA==
+  dependencies:
+    component-emitter "^1.2.0"
+    cookiejar "^2.1.0"
+    debug "^3.1.0"
+    extend "^3.0.0"
+    form-data "^2.3.1"
+    formidable "^1.2.0"
+    methods "^1.1.1"
+    mime "^1.4.1"
+    qs "^6.5.1"
+    readable-stream "^2.3.5"
+
 superagent@^4.0.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/superagent/-/superagent-4.1.0.tgz#c465c2de41df2b8d05c165cbe403e280790cdfd5"
@@ -12828,6 +12844,14 @@ superagent@^4.0.0:
     qs "^6.6.0"
     readable-stream "^3.0.6"
 
+supertest@^4.0.2:
+  version "4.0.2"
+  resolved "https://registry.yarnpkg.com/supertest/-/supertest-4.0.2.tgz#c2234dbdd6dc79b6f15b99c8d6577b90e4ce3f36"
+  integrity sha512-1BAbvrOZsGA3YTCWqbmh14L0YEq0EGICX/nBnfkfVJn7SrxQV1I3pMYjSzG9y/7ZU2V9dWqyqk2POwxlb09duQ==
+  dependencies:
+    methods "^1.1.2"
+    superagent "^3.8.3"
+
 supports-color@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-2.0.0.tgz#535d045ce6b6363fa40117084629995e9df324c7"