content: """Test fixtures."""
  
  from builtins import super
  
  import pytest
  from napalm.base.test import conftest as parent_conftest
  from napalm.base.test.double import BaseTestDouble
  from napalm.nxos_ssh import nxos_ssh
  
  
  @pytest.fixture(scope="class")
  def set_device_parameters(request):
      """Set up the class."""
  
      def fin():
          request.cls.device.close()
  
      request.addfinalizer(fin)
  
      request.cls.driver = nxos_ssh.NXOSSSHDriver
      request.cls.patched_driver = PatchedNXOSSSHDriver
      request.cls.vendor = "nxos_ssh"
      parent_conftest.set_device_parameters(request)
  
  
  def pytest_generate_tests(metafunc):
      """Generate test cases dynamically."""
      parent_conftest.pytest_generate_tests(metafunc, __file__)
  
  
  class PatchedNXOSSSHDriver(nxos_ssh.NXOSSSHDriver):
      """Patched NXOS Driver."""
  
      def __init__(self, hostname, username, password, timeout=60, optional_args=None):
          super().__init__(hostname, username, password, timeout, optional_args)
          self.patched_attrs = ["device"]
          self.device = FakeNXOSSSHDevice()
  
      def disconnect(self):
          pass
  
      def is_alive(self):
          return {"is_alive": True}  # In testing everything works..
  
      def open(self):
          pass
  
  
  class FakeNXOSSSHDevice(BaseTestDouble):
      """NXOS device test double."""
  
      def send_command(self, command, **kwargs):
          filename = "{}.txt".format(self.sanitize_text(command))
          full_path = self.find_file(filename)
          result = self.read_txt_file(full_path)
          return str(result)
  
      def disconnect(self):
          pass
  