Could this be tightened up with?
```diff
diff --git a/spec/vcloud/core/vm_spec.rb b/spec/vcloud/core/vm_spec.rb
index ce60e81..48cb8a6 100644
--- a/spec/vcloud/core/vm_spec.rb
+++ b/spec/vcloud/core/vm_spec.rb
@@ -199,8 +199,8 @@ module Vcloud
           vars = {}
           erbfile = "#{@data_dir}/preamble_post_processor_test_input.erb"
           characters_in_file = File.read(erbfile).size
-          expect(@vm.generate_preamble(erbfile, '/usr/bin/wc', vars)).
-            to match(/\s#{characters_in_file}\s/)
+          expect(@vm.generate_preamble(erbfile, '/usr/bin/wc -c', vars)).
+            to match(/^\s+#{characters_in_file}\s/)
         end
       end
```