diff --git a/circle.yml b/circle.yml
index 46fcd27..74d8d5a 100644
--- a/circle.yml
+++ b/circle.yml
@@ -1,10 +1,11 @@
 machine:
+  environment:
+    MC_SERVER_JAR: /home/ubuntu/node-minecraft-protocol/minecraft-server/minecraft_server.1.8.3.jar
   node:
     version: 0.10.28
+  java:
+    version: openjdk7
 dependencies:
-  override:
-    - npm install --dev
-test:
-  override:
-    - node_modules/.bin/mocha -g "packets"
-    - node_modules/.bin/mocha -g "mc-server"
+  pre:
+    - mkdir minecraft-server
+    - wget https://s3.amazonaws.com/Minecraft.Download/versions/1.8.3/minecraft_server.1.8.3.jar -O $MC_SERVER_JAR
diff --git a/test/test.js b/test/test.js
index 8a266cc..92b19dc 100644
--- a/test/test.js
+++ b/test/test.js
@@ -249,7 +249,10 @@ describe("client", function() {
     });
     batch.end(function(err) {
       if (err) return done(err);
-      //console.log(MC_SERVER_JAR);
+      if (!fs.existsSync(MC_SERVER_JAR)) {
+          return done(new Error("The file "+MC_SERVER_JAR+" doesn't exist."));
+      }
+
       mcServer = spawn('java', [ '-Dlog4j.configurationFile=server/server_debug.xml', '-jar', MC_SERVER_JAR, 'nogui'], {
         stdio: 'pipe',
         cwd: MC_SERVER_PATH,