Optional message in assert method should add a space before stderr

[guillaumevincent]

test_admin_can_execute_sudo_without_password(){
    run_ansible
    assert "grep 'admin ALL=(ALL) NOPASSWD: ALL' /etc/sudoers.d/admin" "admin is not sudoer"
}

optional message in assert method should print stderr on a new line.

admin is not sudoer grep: /etc/sudoers.d/admin: No such file or directory
instead of
admin is not sudoergrep: /etc/sudoers.d/admin: No such file or directory

[pgrange]

Fixed by #16

[pgrange]

@guillaumevincent for your eyes only I detailed the path to displaying stdout and stderr in assert, assert_fail and assert_status_code without repeating ourselves.

See commits in branch assert_print_stdout_stderr https://github.com/pgrange/bash_unit/commits/assert_print_stdout_stderr

... easier when done sooner and with less beer

[guillaumevincent]

thanks for the detailed version :)