pass along hooks, add test to server impl

.eslintrc

@@ -3,6 +3,9 @@
         "finn",
         "finn/node"
     ],
+    "parserOptions": {
+        "ecmaVersion": "2017"
+    },
     "rules": {
         "max-nested-callbacks": "off"
     }

lib/server-impl.js

@@ -21,6 +21,8 @@ function createApp (options) {
         enableRequestLogger: options.enableRequestLogger,
         port: options.port,
         publicFolder: options.publicFolder,
+        preRouterHook: options.preRouterHook,
+        preHook: options.preHook,
         stores,
         eventBus,
     };

lib/server-impl.test.js

@@ -0,0 +1,51 @@
+'use strict';
+
+const test = require('ava');
+const proxyquire = require('proxyquire');
+
+const getApp = proxyquire('./app', {
+    './routes': {
+        createAPI: () => {},
+        createLegacy: () => {},
+    },
+});
+
+const serverImpl = proxyquire('./server-impl', {
+    './app': getApp,
+    './metrics': {
+        startMonitoring (o) {
+            return o;
+        },
+    },
+    './db': {
+        createStores (o) {
+            return o;
+        },
+    },
+    './options': {
+        createOptions (o) {
+            return o;
+        },
+    },
+    '../migrator' () {
+        return Promise.resolve();
+    },
+});
+
+test('should call preHook', async t => {
+    let called = 0;
+    await serverImpl.start({
+        preHook: () => {
+            called++;
+        },
+    });
+    t.true(called === 1);
+});
+
+test('should call preRouterHook', async t => {
+    let called = 0;
+    await serverImpl.start({ preRouterHook: () => {
+        called++;
+    } });
+    t.true(called === 1);
+});