Issue #5352 - generate_static_pages cannot deal with directories being turned into regular pages

tests/test_generation_exceptional_cases.py

 # This file is part of the Adblock Plus web scripts,
 # Copyright (C) 2006-present eyeo GmbH
 #
 # Adblock Plus is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 3 as
 # published by the Free Software Foundation.
 #
 # Adblock Plus is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
@@ skipping 44 matching lines @@
     assert os.path.isdir(os.path.join(target_dir_with_file, 'en', 'foo'))
 
 
 def test_generate_file_instead_of_dir(temp_site, target_dir_with_dir):
     """Case where a directory from previous version becomes a file."""
     generate_pages(str(temp_site), str(target_dir_with_dir))
 
     assert os.path.isfile(os.path.join(target_dir_with_dir, 'en', 'translate'))
 
 
-@pytest.mark.script_launch_mode('subprocess')
 def test_generate_fifo_instead_of_file(temp_site, target_dir_with_fifo,
                                        script_runner):
-    cmd = ['python', '-m', 'cms.bin.generate_static_pages', str(temp_site),
-           str(target_dir_with_fifo)]
+    """Case with an unsupported item encountered (FIFO)."""
+    with pytest.raises(Exception) as exp:
+        generate_pages(str(temp_site), str(target_dir_with_fifo))
 
-    ret = script_runner.run(*cmd)
-
-    assert not ret.success
-    assert 'It is neither a file, nor a directory!' in ret.stderr
+    assert 'It is neither a file, nor a directory!' in str(exp.value)