From c15c868e2fc5be41567e902b41494c7c5a2961da Mon Sep 17 00:00:00 2001
From: Ralf Teusner <ralf.teusner@hpi.de>
Date: Sun, 1 May 2016 16:29:02 +0200
Subject: [PATCH] prevent negative scores from changed test score extraction

---
 lib/assessor.rb | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/assessor.rb b/lib/assessor.rb
index 1d395dc7..910b5939 100644
--- a/lib/assessor.rb
+++ b/lib/assessor.rb
@@ -12,6 +12,8 @@ class Assessor
     score = 0.0;
     if(test_outcome[:passed].to_f != 0.0 && test_outcome[:count].to_f != 0.0)
       score = (test_outcome[:passed].to_f / test_outcome[:count].to_f)
+      # prevent negative scores
+      score = [0.0, score].max
     end
     score
   end