Handle invalid checksums

1 files changed, 4 insertions, 1 deletions

diff --git a/engine.rb b/engine.rb
index b04e2f2..7b9ddf0 100644
--- a/engine.rb
+++ b/engine.rb
@@ -1,3 +1,6 @@
+class InvalidChecksumError < StandardError
+end
+
 class Engine
   def initialize hash
     validate_checksum hash
@@ -6,7 +9,7 @@ class Engine
 
   def validate_checksum hash
     if !checksum_valid? hash
-      throw 'Invalid state, checksum does not match!'
+      raise InvalidChecksumError
     end
   end