Add a with_no_args option for mocks

[robkinyon]

Let's say I have a script that invokes a command twice as part of its execution, once with arguments and once without. Example:

#!/bin/bash

foo=$(my-script)
bar=$(my-script A)
echo "'$foo' '$bar'"

with a test of

let!(mocker) {
    stubbed_env.mock('my-script')
      .with_args('A').outputs('1')
      .with_no_args().outputs('2')
}
stdout,stderr,exitstatus = stubbed_env.execute(thing_under_test)
expect(stdout).to eql("'2' '1'")

Right now, there is no way to do this.