InitFakeCmd is for creating a fake exec.Cmd.

FakeCmd is a simple scripted Cmd type.

FakeExec is a simple scripted Interface type.

FakeExitError is a simple fake ExitError type.

FakeStdIOPipeResponse holds responses to use as fakes for the StdoutPipe and StderrPipe method calls.

FakeAction is a function type.

FakeCommandAction is the function to be executed.