diff --git a/package.json b/package.json
index 7b55ba5e..7ff792c0 100644
--- a/package.json
+++ b/package.json
@@ -32,8 +32,16 @@
 		"query-string": "^5.0.0",
 		"slugg": "^1.2.0"
 	},
+	"devDependencies": {
+		"db-stations": "^1.25.0",
+		"floordate": "^3.0.0",
+		"is-roughly-equal": "^0.1.0",
+		"tap-spec": "^4.1.1",
+		"tape": "^4.8.0",
+		"tape-promise": "^2.0.1"
+	},
 	"scripts": {
-		"test": "node -e \"require('.')\"",
+		"test": "node test/index.js | tap-spec",
 		"prepublishOnly": "npm test"
 	}
 }
diff --git a/test/db.js b/test/db.js
new file mode 100644
index 00000000..63bbd389
--- /dev/null
+++ b/test/db.js
@@ -0,0 +1,169 @@
+'use strict'
+
+const tapePromise = require('tape-promise').default
+const tape = require('tape')
+const isRoughlyEqual = require('is-roughly-equal')
+
+const createClient = require('..')
+const {
+	findStation,
+	assertValidStation,
+	assertValidPoi,
+	assertValidAddress,
+	assertValidLocation,
+	assertValidLine,
+	assertValidStopover,
+	isJungfernheide, assertIsJungfernheide,
+	when, isValidWhen
+} = require('./util.js')
+
+const test = tapePromise(tape)
+const client = createClient(dbProfile)
+
+test('Berlin Jungfernheide to München Hbf', async (t) => {
+	const journeys = await client.journeys('8011167', '8000261', {
+		when, passedStations: true
+	})
+
+	t.ok(Array.isArray(journeys))
+	t.ok(journeys.length > 0, 'no journeys')
+	for (let journey of journeys) {
+		assertValidStation(t, journey.origin)
+		if (!await findStation(journey.origin.id)) {
+			console.error('unknown station', journey.origin.id, journey.origin.name)
+		}
+		t.ok(isValidWhen(journey.departure))
+
+		assertValidStation(t, journey.destination)
+		if (!await findStation(journey.origin.id)) {
+			console.error('unknown station', journey.destination.id, journey.destination.name)
+		}
+		t.ok(isValidWhen(journey.arrival))
+
+		t.ok(Array.isArray(journey.parts))
+		t.ok(journey.parts.length > 0, 'no parts')
+		const part = journey.parts[0]
+
+		assertValidStation(t, part.origin)
+		if (!await findStation(part.origin.id)) {
+			console.error('unknown station', part.origin.id, part.origin.name)
+		}
+		t.ok(isValidWhen(part.departure))
+		t.equal(typeof part.departurePlatform, 'string')
+
+		assertValidStation(t, part.destination)
+		if (!await findStation(part.destination.id)) {
+			console.error('unknown station', part.destination.id, part.destination.name)
+		}
+		t.ok(isValidWhen(part.arrival))
+		t.equal(typeof part.arrivalPlatform, 'string')
+
+		assertValidLine(t, part.line)
+
+		t.ok(Array.isArray(part.passed))
+		for (let stopover of part.passed) assertValidStopover(t, stopover)
+	}
+
+	t.end()
+})
+
+test('Berlin Jungfernheide to Torfstraße 17', async (t) => {
+	const journeys = await client.journeys('8011167', {
+		type: 'address', name: 'Torfstraße 17',
+		latitude: 52.5416823, longitude: 13.3491223
+	}, {when})
+
+	t.ok(Array.isArray(journeys))
+	t.ok(journeys.length >= 1, 'no journeys')
+	const journey = journeys[0]
+	const part = journey.parts[journey.parts.length - 1]
+
+	assertValidStation(t, part.origin)
+	if (!await findStation(part.origin.id)) {
+		console.error('unknown station', part.origin.id, part.origin.name)
+	}
+	t.ok(isValidWhen(part.departure))
+	t.ok(isValidWhen(part.arrival))
+
+	const d = part.destination
+	assertValidAddress(t, d)
+	t.equal(d.name, 'Torfstraße 17')
+	t.ok(isRoughlyEqual(.0001, d.coordinates.latitude, 52.5416823))
+	t.ok(isRoughlyEqual(.0001, d.coordinates.longitude, 13.3491223))
+
+	t.end()
+})
+
+test('Berlin Jungfernheide to ATZE Musiktheater', async (t) => {
+	const journeys = await client.journeys('8011167', {
+		type: 'poi', name: 'ATZE Musiktheater', id: '991598902',
+		latitude: 52.542417, longitude: 13.350437
+	}, {when})
+
+	t.ok(Array.isArray(journeys))
+	t.ok(journeys.length >= 1, 'no journeys')
+	const journey = journeys[0]
+	const part = journey.parts[journey.parts.length - 1]
+
+	assertValidStation(t, part.origin)
+	if (!await findStation(part.origin.id)) {
+		console.error('unknown station', part.origin.id, part.origin.name)
+	}
+	t.ok(isValidWhen(part.departure))
+	t.ok(isValidWhen(part.arrival))
+
+	const d = part.destination
+	assertValidPoi(t, d)
+	t.equal(d.name, 'ATZE Musiktheater')
+	t.ok(isRoughlyEqual(.0001, d.coordinates.latitude, 52.542399))
+	t.ok(isRoughlyEqual(.0001, d.coordinates.longitude, 13.350402))
+
+	t.end()
+})
+
+test('departures at Berlin Jungfernheide', async (t) => {
+	const deps = await client.departures('8011167', {
+		duration: 5, when
+	})
+
+	t.ok(Array.isArray(deps))
+	for (let dep of deps) {
+		assertValidStation(t, dep.station)
+		if (!await findStation(dep.station.id)) {
+			console.error('unknown station', dep.station.id, dep.station.name)
+		}
+		t.ok(isValidWhen(dep.when))
+	}
+
+	t.end()
+})
+
+test('nearby Berlin Jungfernheide', async (t) => {
+	const nearby = await client.nearby(52.530273, 13.299433, {
+		results: 2, distance: 400
+	})
+
+	t.ok(Array.isArray(nearby))
+	t.equal(nearby.length, 2)
+
+	assertIsJungfernheide(t, nearby[0])
+	t.ok(nearby[0].distance >= 0)
+	t.ok(nearby[0].distance <= 100)
+
+	t.end()
+})
+
+test('locations named Jungfernheide', async (t) => {
+	const locations = await client.locations('Jungfernheide', {
+		results: 10
+	})
+
+	t.ok(Array.isArray(locations))
+	t.ok(locations.length > 0)
+	t.ok(locations.length <= 10)
+
+	for (let location of locations) assertValidLocation(t, location)
+	t.ok(locations.find(isJungfernheide))
+
+	t.end()
+})
diff --git a/test/index.js b/test/index.js
new file mode 100644
index 00000000..30db69dc
--- /dev/null
+++ b/test/index.js
@@ -0,0 +1,3 @@
+'use strict'
+
+require('./db')
diff --git a/test/util.js b/test/util.js
new file mode 100644
index 00000000..6a7a7621
--- /dev/null
+++ b/test/util.js
@@ -0,0 +1,131 @@
+'use strict'
+
+const isRoughlyEqual = require('is-roughly-equal')
+const getStations = require('db-stations').full
+const floor = require('floordate')
+
+const findStation = (id) => new Promise((yay, nay) => {
+	const stations = getStations()
+	stations
+	.once('error', nay)
+	.on('data', (s) => {
+		if (
+			s.id === id ||
+			(s.additionalIds && s.additionalIds.includes(id))
+		) {
+			yay(s)
+			stations.destroy()
+		}
+	})
+	.once('end', yay)
+})
+
+const assertValidStation = (t, s) => {
+	t.equal(s.type, 'station')
+	t.equal(typeof s.id, 'string')
+}
+
+const assertValidPoi = (t, p) => {
+	t.equal(p.type, 'poi')
+	t.equal(typeof p.id, 'string')
+}
+
+const assertValidAddress = (t, a) => {
+	t.equal(a.type, 'address')
+}
+
+const assertValidLocation = (t, l) => {
+	t.equal(typeof l.type, 'string')
+	if (l.type === 'station') assertValidStation(t, l)
+	else if (l.type === 'poi') assertValidPoi(t, l)
+	else if (l.type === 'address') assertValidAddress(t, l)
+	else t.fail('invalid type ' + l.type)
+
+	t.equal(typeof s.name, 'string')
+	t.ok(s.coordinates)
+	t.equal(typeof s.coordinates.latitude, 'number')
+	t.equal(typeof s.coordinates.longitude, 'number')
+}
+
+const isValidMode = (m) => {
+	return m === 'walking' ||
+		m === 'train' ||
+		m === 'bus' ||
+		m === 'ferry'
+}
+
+const assertValidLine = (t, l) => {
+	t.equal(l.type, 'line')
+	t.equal(typeof l.name, 'string')
+	t.ok(isValidMode(l.mode))
+	t.equal(typeof l.product, 'string')
+}
+
+const isValidDateTime = (w) => {
+	return !Number.isNaN(+new Date(w))
+}
+
+const assertValidStopover = (t, s) => {
+	if ('arrival' in s) t.ok(isValidDateTime(s.arrival))
+	if ('departure' in s) t.ok(isValidDateTime(s.departure))
+	if (!('arrival' in s) && !('departure' in s)) {
+		t.fail('stopover doesn\'t contain arrival or departure')
+	}
+	t.ok(s.station)
+	assertValidStation(t, s.station)
+}
+
+const isJungfernheide = (s) => {
+	return s.type === 'station' &&
+	s.id === '8011167' &&
+	s.name === 'Berlin Jungfernheide' &&
+	s.coordinates &&
+	isRoughlyEqual(s.coordinates.latitude, 52.530408, .0005) &&
+	isRoughlyEqual(s.coordinates.longitude, 13.299424, .0005)
+}
+
+const assertIsJungfernheide = (t, s) => {
+	t.equal(s.type, 'station')
+	t.equal(s.id, '8011167')
+	t.equal(s.name, 'Berlin Jungfernheide')
+	t.ok(s.coordinates)
+	t.ok(isRoughlyEqual(s.coordinates.latitude, 52.530408, .0005))
+	t.ok(isRoughlyEqual(s.coordinates.longitude, 13.299424, .0005))
+}
+
+const assertIsMünchenHbf = (s) => {
+	t.equal(s.type, 'station')
+	t.equal(s.id, '8000261')
+	t.equal(s.name, 'München Hbf')
+	t.ok(s.coordinates)
+	t.equal(s.coordinates.latitude, 48.140229)
+	t.equal(s.coordinates.longitude, 11.558339)
+}
+
+const minute = 60 * 1000
+const hour = 60 * minute
+const day = 24 * hour
+const week = 7 * day
+
+// next Monday
+const when = new Date(+floor(new Date(), 'week') + week + 10 * hour)
+const isValidWhen = (w) => {
+	const ts = +new Date(w)
+	if (Number.isNaN(ts)) return false
+	return isRoughlyEqual(10 * hour, +when, ts)
+}
+
+module.exports = {
+	findStation,
+	assertValidStation,
+	assertValidPoi,
+	assertValidAddress,
+	assertValidLocation,
+	isValidMode,
+	assertValidLine,
+	isValidDateTime,
+	assertValidStopover,
+	isJungfernheide, assertIsJungfernheide,
+	assertIsMünchenHbf,
+	when, isValidWhen
+}