diff --git a/.github/workflows/docker-image.yml b/.github/workflows/docker-image.yml
index 283a2d7..ae28707 100644
--- a/.github/workflows/docker-image.yml
+++ b/.github/workflows/docker-image.yml
@@ -4,8 +4,21 @@ on:
     branches:
       - 5
 jobs:
+  lint-test:
+    name: lint & test
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout
+      uses: actions/checkout@v2
+    - name: setup Node
+      uses: actions/setup-node@v1
+      with:
+        node-version: 16.x
+    - run: npm install
+    - run: npm test
   build-and-publish:
     name: build & publish Docker image
+    needs: [lint-test]
     runs-on: ubuntu-latest
     steps:
       - name: check out the repo
diff --git a/api.js b/api.js
index cb0c5c9..7118766 100644
--- a/api.js
+++ b/api.js
@@ -71,6 +71,7 @@ const api = createApi(hafas, config, (api) => {
 })
 
 module.exports = {
+	hafas,
 	config,
 	api,
 }
diff --git a/package.json b/package.json
index e4b838e..cf9e277 100644
--- a/package.json
+++ b/package.json
@@ -36,11 +36,16 @@
 	},
 	"devDependencies": {
 		"@derhuerst/technical-docs-cli": "^1.1.0",
-		"pino-pretty": "^4.0.0"
+		"axios": "^0.26.1",
+		"get-port": "^5.1.1",
+		"pino-pretty": "^4.0.0",
+		"tap-min": "^2.0.0",
+		"tape": "^5.5.2"
 	},
 	"scripts": {
 		"docs": "node api-docs.js >docs/api.md && build-technical-doc --syntax-stylesheet-url /syntax.css <docs/readme.md >docs/index.html && build-technical-doc --syntax-stylesheet-url /syntax.css <docs/getting-started.md >docs/getting-started.html && build-technical-doc --syntax-stylesheet-url /syntax.css <docs/api.md >docs/api.html && build-technical-doc --syntax-stylesheet github >docs/syntax.css",
 		"build": "npm run docs",
-		"start": "node index.js"
+		"start": "node index.js",
+		"test": "node test.js | tap-min"
 	}
 }
diff --git a/test/index.js b/test/index.js
new file mode 100644
index 0000000..c309e07
--- /dev/null
+++ b/test/index.js
@@ -0,0 +1,6 @@
+'use strict'
+
+const tape = require('tape')
+const {fetchWithTestApi} = require('./util')
+
+// todo
diff --git a/test/util.js b/test/util.js
new file mode 100644
index 0000000..3498ee2
--- /dev/null
+++ b/test/util.js
@@ -0,0 +1,56 @@
+'use strict'
+
+const createApi = require('hafas-rest-api')
+const getPort = require('get-port')
+const {createServer} = require('http')
+const {promisify} = require('util')
+const axios = require('axios')
+const pkg = require('../package.json')
+const {config, hafas: unmockedHafas} = require('../api')
+
+// adapted from https://github.com/public-transport/hafas-rest-api/blob/60335eacd8332d7f448da875a7498dd97934e360/test/util.js#L40-L77
+const createTestApi = async (mocks, cfg) => {
+	const mockedHafas = Object.assign(Object.create(unmockedHafas), mocks)
+
+	cfg = {
+		...config,
+		hostname: 'localhost',
+		name: 'test',
+		version: '1.2.3a',
+		homepage: 'http://example.org',
+		description: 'test API',
+		docsLink: 'https://example.org',
+		logging: false,
+		...cfg,
+	}
+
+	const api = createApi(mockedHafas, cfg, () => {})
+	const server = createServer(api)
+
+	const port = await getPort()
+	await promisify(server.listen.bind(server))(port)
+
+	const stop = () => promisify(server.close.bind(server))()
+	const fetch = (path, opt = {}) => {
+		opt = Object.assign({
+			method: 'get',
+			baseURL: `http://localhost:${port}/`,
+			url: path,
+			timeout: 5000
+		}, opt)
+		return axios(opt)
+	}
+	return {stop, fetch}
+}
+
+const fetchWithTestApi = async (mocks, cfg, path, opt = {}) => {
+	const {fetch, stop} = await createTestApi(mocks, cfg)
+	const res = await fetch(path, opt)
+	await stop()
+	return res
+}
+
+module.exports = {
+	createTestApi,
+	fetchWithTestApi,
+}