Revert "Bad fix for test_begin_end by ending global session"

This reverts commit 57efa55.

pygmt/tests/test_session_management.py

@@ -2,26 +2,21 @@
 Test the session management modules.
 """
 import os
-import pytest
 
 from ..session_management import begin, end
 from ..clib import Session
-from ..exceptions import GMTCLibError
 
 
 def test_begin_end():
  """"
  Run a command inside a begin-end modern mode block.
  First, end the global session. When finished, restart it.
  """
- with pytest.raises(GMTCLibError, match="Module 'end' failed with status code 78:"):
- end() # Kill the global session first
-
+ end() # Kill the global session
  begin()
  with Session() as lib:
  lib.call_module("basemap", "-R10/70/-3/8 -JX4i/3i -Ba")
  end()
-
  begin() # Restart the global session
  assert os.path.exists("pygmt-session.pdf")
  os.remove("pygmt-session.pdf")