Support windows internal commands

lib/aruba/platforms/unix_platform.rb

@@ -236,6 +236,10 @@ def simple_table(hash, opts = {})
  def which(program, path = ENV['PATH'])
  UnixWhich.new.call(program, path)
  end
+
+ def builtin_shell_commands
+ []
+ end
  end
  end
 end

lib/aruba/platforms/windows_platform.rb

@@ -37,6 +37,10 @@ def environment_variables
  def which(program, path = ENV['PATH'])
  WindowsWhich.new.call(program, path)
  end
+
+ def builtin_shell_commands
+ ['cd', 'dir', 'echo', 'exit', 'set', 'type']
+ end
  end
  end
 end

lib/aruba/processes/spawn_process.rb

@@ -206,7 +206,7 @@ def terminate
  end
 
  @exit_status = @process.exit_code
-
+ 
  @stdout_cache = read_temporary_output_file @stdout_file
  @stderr_cache = read_temporary_output_file @stderr_file
 
@@ -262,12 +262,11 @@ def interactive?
 
  def command_string
  fail LaunchError, %(Command "#{command}" not found in PATH-variable "#{environment['PATH']}".) if command_path.nil?
-
  Aruba.platform.command_string.new(command_path, *arguments)
  end
 
  def command_path
- @command_path ||= Aruba.platform.which(command, environment['PATH'])
+ @command_path ||= (Aruba.platform.builtin_shell_commands.include?(command) ? command : Aruba.platform.which(command, environment['PATH']))
  end
 
  def wait_for_io(time_to_wait)