This is more a reminder to myself, but I hope it’s useful to others. If you’re using xunit for unit testing and Moles for isolation/mocking then you may run into a problem using the moles test runner, whereby you receive an error stating “error: missing filename”.

For example, consider the following in the build file:

moles.runner /x86      
  /runner:"d:\tools\xunit\xunit.console.clr4.x86.exe"
  "d:\project\foo.dll"
  /args:"xml d:\project\foo.xml"

While a similar command works at the command line, in the runner it fails. The answer, as supplied by Heather, is to supply the arguments separately:

moles.runner /x86
  /runner:"d:\tools\xunit\xunit.console.clr4.x86.exe"
  "d:\project\foo.dll"
  /args:"xml" /args:"d:\project\foo.xml"