diff --git a/lib/app.test.js b/lib/app.test.js
new file mode 100644
index 0000000000..2124cb10a2
--- /dev/null
+++ b/lib/app.test.js
@@ -0,0 +1,31 @@
+'use strict';
+
+const test = require('ava');
+const proxyquire = require('proxyquire');
+const getApp = proxyquire('./app', {
+    './routes': {
+        createAPI: () => {},
+        createLegacy: () => {},
+    },
+});
+
+test('should not throw when valid config', t => {
+    const app = getApp({});
+    t.true(typeof app.listen === 'function');
+});
+
+test('should call preHook', t => {
+    let called = 0;
+    getApp({ preHook: () => {
+        called++;
+    } });
+    t.true(called === 1);
+});
+
+test('should call preRouterHook', t => {
+    let called = 0;
+    getApp({ preRouterHook: () => {
+        called++;
+    } });
+    t.true(called === 1);
+});
diff --git a/package.json b/package.json
index f0077faa6c..0e3ebdac3a 100644
--- a/package.json
+++ b/package.json
@@ -85,6 +85,7 @@
     "eslint": "^3.11.1",
     "eslint-config-finn": "^1.0.0-beta.1",
     "nyc": "^9.0.1",
+    "proxyquire": "^1.7.10",
     "sinon": "^1.17.5",
     "superagent": "^2.3.0",
     "supertest": "^2.0.1",