text: # Copyright The PyTorch Lightning team.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  import os
  from unittest import mock
  
  import pytest
  
  from pytorch_lightning.plugins.environments import LSFEnvironment
  
  
  @mock.patch.dict(os.environ, {"LSB_HOSTS": "batch 10.10.10.0 10.10.10.1", "LSB_JOBID": "1234"})
  def test_missing_lsb_hosts():
      """Test an error when the lsb hosts list cannot be found."""
      del os.environ["LSB_HOSTS"]
      with pytest.raises(ValueError, match="Could not find hosts in environment variable LSB_HOSTS"):
          LSFEnvironment()
  
  
  @mock.patch.dict(os.environ, {"LSB_HOSTS": "batch 10.10.10.0 10.10.10.1", "LSB_JOBID": "1234"})
  def test_missing_lsb_job_id():
      """Test an error when the job id cannot be found."""
      del os.environ["LSB_JOBID"]
      with pytest.raises(ValueError, match="Could not find job id in environment variable LSB_JOBID"):
          LSFEnvironment()
  
  
  @mock.patch.dict(os.environ, {"MASTER_PORT": "4321", "LSB_JOBID": "1234", "LSB_HOSTS": "batch 10.10.10.0 10.10.10.1"})
  def test_manual_main_port_and_address():
      """Test a user can set the port manually through the MASTER_PORT env variable."""
      env = LSFEnvironment()
      assert env.main_port == 4321
  
  
  @mock.patch.dict(
      os.environ,
      {
          "LSB_HOSTS": "batch 10.10.10.0 10.10.10.1 10.10.10.2 10.10.10.3",
          "LSB_JOBID": "1234",
          "JSM_NAMESPACE_SIZE": "4",
          "JSM_NAMESPACE_RANK": "3",
          "JSM_NAMESPACE_LOCAL_RANK": "1",
      },
  )
  def test_attributes_from_environment_variables():
      """Test that the LSF environment takes the attributes from the environment variables."""
      env = LSFEnvironment()
      assert env.creates_processes_externally
      assert env.main_address == "10.10.10.0"
      assert env.main_port == 10234
      assert env.world_size() == 4
      assert env.global_rank() == 3
      assert env.local_rank() == 1
      env.set_global_rank(100)
      assert env.global_rank() == 3
      env.set_world_size(100)
      assert env.world_size() == 4
      assert LSFEnvironment.detect()
  
  
  @mock.patch("socket.gethostname", return_value="host2")
  @mock.patch.dict(os.environ, {"LSB_HOSTS": "batch host0 host1 host2 host3", "LSB_JOBID": "1234"})
  def test_node_rank(_):
      env = LSFEnvironment()
      assert env.node_rank() == 2
  
  
  def test_detect():
      """Test the detection of a LSF environment configuration."""
      with mock.patch.dict(os.environ, {}):
          assert not LSFEnvironment.detect()
  
      with mock.patch.dict(
          os.environ,
          {
              "LSB_HOSTS": "",
              "LSB_JOBID": "",
              "JSM_NAMESPACE_SIZE": "",
              "JSM_NAMESPACE_LOCAL_RANK": "",
          },
      ):
          assert LSFEnvironment.detect()
  