Fixes CLI tests for windows

[kookookchoozeus]

Fixes #559

All that was needed was a helper function for transforming *nix commands into windows commands:

• Makes sure bin/mustache is run with node
• Replaces cat with type
• Replaces forward slashes with backward slashes

Leaves commands as they are for *nix, so won't break the tests there

Also replaced the Could not find file strings to be compatible for windows

[dasilvacontin]

Thanks @kookookchoozeus!

I think it would be cleaner to hijack exec calls so that you don't need to explicitly use changeOS around, alla:

var child_process = require('child_process')

function exec () {
  arguments[0] = changeOS(arguments[0])
  return child_process.exec.apply(child_process, arguments)
}

[dasilvacontin]

I think it would be preferable to wrap the regexes with \b symbols, like /\bcat\b/. Right now any word/filename ending with cat will instead end with type. It's an unlikely scenario, but it's existence makes the solution not as clean, I feel.

[kookookchoozeus]

Thanks @dasilvacontin, very good suggestions that I should have realized myself, haha.

[dasilvacontin]

Could you explain why the assertion was split into two different ones?

[kookookchoozeus]

The filepath is absolute on Windows (e.g. C:\Users\you\path\to\mustache\test_files...)

[dasilvacontin]

I see. That's not very obvious, just by reading the code..

I was going to suggest using a regex, eg /Could not find file.*non-existing-template\.mustache/., but don't worry about it, I'm going to refactor these assertions after we merge this PR (using unexpected or some nice assertion library).

[kookookchoozeus]

My initial thought was to use a regex as well, but then you'd also have to take the backslash problem into account with [\/\\]{1,2}

[dasilvacontin]

Not if you only add the last part of the file's path to the regex, you have no worries about the slashes that way. :)

[dasilvacontin]

And I just noticed I used fs instead of child_process in my example. :')

[kookookchoozeus]

Update: made the changes suggested above, hoping to get this merged soon so I can update #558

[dasilvacontin]

LGTM, thanks @kookookchoozeus! :)