diff --git a/server/CloudflareAPI.js b/server/CloudflareAPI.js
index d407804..d011922 100644
--- a/server/CloudflareAPI.js
+++ b/server/CloudflareAPI.js
@@ -1,5 +1,5 @@
 require('isomorphic-fetch')
-const warning = require('warning')
+const invariant = require('invariant')
 const gunzip = require('gunzip-maybe')
 const ndjson = require('ndjson')
 
@@ -7,12 +7,12 @@ const CloudflareAPIURL = 'https://api.cloudflare.com'
 const CloudflareEmail = process.env.CLOUDFLARE_EMAIL
 const CloudflareKey = process.env.CLOUDFLARE_KEY
 
-warning(
+invariant(
   CloudflareEmail,
   'Missing the $CLOUDFLARE_EMAIL environment variable'
 )
 
-warning(
+invariant(
   CloudflareKey,
   'Missing the $CLOUDFLARE_KEY environment variable'
 )
diff --git a/server/createServer.js b/server/createServer.js
index 557e71a..2ddc2d6 100644
--- a/server/createServer.js
+++ b/server/createServer.js
@@ -9,9 +9,6 @@ const packageURL = require('./middleware/packageURL')
 const fetchFile = require('./middleware/fetchFile')
 const serveFile = require('./middleware/serveFile')
 
-const createSearchServer = require('./createSearchServer')
-const createStatsServer = require('./createStatsServer')
-
 morgan.token('fwd', function (req) {
   return req.get('x-forwarded-for').replace(/\s/g, '')
 })
@@ -48,8 +45,13 @@ function createApp() {
     maxAge: '365d'
   }))
 
-  app.use('/_search', createSearchServer())
-  app.use('/_stats', createStatsServer())
+  if (process.env.NODE_ENV !== 'test') {
+    const createSearchServer = require('./createSearchServer')
+    app.use('/_search', createSearchServer())
+
+    const createStatsServer = require('./createStatsServer')
+    app.use('/_stats', createStatsServer())
+  }
 
   app.use('/',
     packageURL,