diff --git a/spec/support/shared_contexts/aruba.rb b/spec/support/shared_contexts/aruba.rb
index d7889547b..51f79dc9e 100644
--- a/spec/support/shared_contexts/aruba.rb
+++ b/spec/support/shared_contexts/aruba.rb
@@ -32,6 +32,7 @@ def set_tag(tag_name, value)
     @file_size = 256
     @file_path = @aruba.expand_path(@file_name)
     @aruba.setup_aruba
+    raise "File #{@file_path} exists" if File.exist? @file_path
 
     if @aruba.aruba.current_directory[0] == "/"
       raise "We must work with relative paths, everything else is dangerous"