old_contents: import pytest
  import ceph_medic.main
  
  
  class TestMain(object):
      def test_main(self):
          assert ceph_medic.main
  
      def test_invalid_ssh_config(self, capsys):
          argv = ["ceph-medic", "--ssh-config", "/does/not/exist"]
          with pytest.raises(SystemExit):
              ceph_medic.main.Medic(argv)
          out = capsys.readouterr()
          assert 'the given ssh config path does not exist' in out.out
  
new_contents: import pytest
  import ceph_medic.main
  
  
  class TestMain(object):
      def test_main(self):
          assert ceph_medic.main
  
      def test_invalid_ssh_config(self, capsys):
          argv = ["ceph-medic", "--ssh-config", "/does/not/exist"]
          with pytest.raises(SystemExit):
              ceph_medic.main.Medic(argv)
          out = capsys.readouterr()
          assert 'the given ssh config path does not exist' in out.out
  
      def test_valid_ssh_config(self, capsys):
          ssh_config = '/etc/ssh/ssh_config'
          argv = ["ceph-medic", "--ssh-config", ssh_config]
          ceph_medic.main.Medic(argv)
          out = capsys.readouterr()
          assert out.out == ''
          assert ssh_config == ceph_medic.main.ceph_medic.config.ssh_config
  
subject: Add test for valid ssh_config