diff --git a/spec/terminator_spec.rb b/spec/terminator_spec.rb
index <HASH>..<HASH> 100644
--- a/spec/terminator_spec.rb
+++ b/spec/terminator_spec.rb
@@ -21,4 +21,10 @@ describe Consular::Terminator do
     Kernel.expects(:`).with('which xdotool').returns('which: command not found')

     Consular::Terminator.valid_system?.should == false

   end

+

+  it 'should treat systems without "xdotool" as invalid' do

+    RbConfig::CONFIG.expects(:[]).returns({ 'host_os' => 'x86-linux' })

+    Kernel.expects(:`).with('which xdotool').returns('')

+    Consular::Terminator.valid_system?.should == false

+  end

 end
Document that we need xdotool