Before:
  Save g:ale_warn_about_trailing_blank_lines

  let g:ale_warn_about_trailing_blank_lines = 1

  runtime ale_linters/python/flake8.vim

After:
  Restore

  unlet! b:ale_warn_about_trailing_blank_lines

  call ale#linter#Reset()

Execute(The flake8 handler should handle basic warnings and syntax errors):
  AssertEqual
  \ [
  \   {
  \     'lnum': 6,
  \     'col': 6,
  \     'type': 'E',
  \     'text': 'indentation is not a multiple of four',
  \     'code': 'E111',
  \     'sub_type': 'style',
  \   },
  \   {
  \     'lnum': 7,
  \     'col': 6,
  \     'type': 'W',
  \     'text': 'some warning',
  \     'code': 'W123',
  \     'sub_type': 'style',
  \   },
  \   {
  \     'lnum': 8,
  \     'col': 3,
  \     'type': 'E',
  \     'text': 'SyntaxError: invalid syntax',
  \     'code': 'E999',
  \   },
  \ ],
  \ ale_linters#python#flake8#Handle(1, [
  \   'stdin:6:6: E111 indentation is not a multiple of four',
  \   'stdin:7:6: W123 some warning',
  \   'stdin:8:3: E999 SyntaxError: invalid syntax',
  \ ])

Execute(The flake8 handler should set end column indexes should be set for certain errors):
  AssertEqual
  \ [
  \   {
  \     'lnum': 25,
  \     'col': 1,
  \     'type': 'E',
  \     'end_col': 3,
  \     'text': 'undefined name ''foo''',
  \     'code': 'F821',
  \   },
  \   {
  \     'lnum': 28,
  \     'col': 5,
  \     'type': 'E',
  \     'end_col': 9,
  \     'text': 'hello may be undefined, or defined from star imports: x',
  \     'code': 'F405',
  \   },
  \   {
  \     'lnum': 104,
  \     'col': 5,
  \     'type': 'E',
  \     'end_col': 12,
  \     'text': '''continue'' not properly in loop',
  \     'code': 'F999',
  \   },
  \   {
  \     'lnum': 106,
  \     'col': 5,
  \     'type': 'E',
  \     'end_col': 9,
  \     'text': '''break'' outside loop',
  \     'code': 'F999',
  \   },
  \   {
  \     'lnum': 109,
  \     'col': 5,
  \     'type': 'E',
  \     'end_col': 8,
  \     'text': 'local variable ''test'' is assigned to but never used',
  \     'code': 'F841',
  \   },
  \ ],
  \ ale_linters#python#flake8#Handle(1, [
  \ 'foo.py:25:1: F821 undefined name ''foo''',
  \ 'foo.py:28:5: F405 hello may be undefined, or defined from star imports: x',
  \ 'foo.py:104:5: F999 ''continue'' not properly in loop',
  \ 'foo.py:106:5: F999 ''break'' outside loop',
  \ 'foo.py:109:5: F841 local variable ''test'' is assigned to but never used',
  \ ])

Execute(The flake8 handler should handle stack traces):
  AssertEqual
  \ [
  \   {
  \     'lnum': 1,
  \     'text': 'An exception was thrown. See :ALEDetail',
  \     'detail': join([
  \       'Traceback (most recent call last):',
  \       '  File "/usr/local/bin/flake8", line 7, in <module>',
  \       '    from flake8.main.cli import main',
  \       '  File "/usr/local/lib/python2.7/dist-packages/flake8/main/cli.py", line 2, in <module>',
  \       '    from flake8.main import application',
  \       '  File "/usr/local/lib/python2.7/dist-packages/flake8/main/application.py", line 17, in <module>',
  \       '    from flake8.plugins import manager as plugin_manager',
  \       '  File "/usr/local/lib/python2.7/dist-packages/flake8/plugins/manager.py", line 5, in <module>',
  \       '    import pkg_resources',
  \       '  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 35, in <module>',
  \       '    import email.parser',
  \       'ImportError: No module named parser',
  \     ], "\n"),
  \   },
  \ ],
  \ ale_linters#python#flake8#Handle(42, [
  \   'Traceback (most recent call last):',
  \   '  File "/usr/local/bin/flake8", line 7, in <module>',
  \   '    from flake8.main.cli import main',
  \   '  File "/usr/local/lib/python2.7/dist-packages/flake8/main/cli.py", line 2, in <module>',
  \   '    from flake8.main import application',
  \   '  File "/usr/local/lib/python2.7/dist-packages/flake8/main/application.py", line 17, in <module>',
  \   '    from flake8.plugins import manager as plugin_manager',
  \   '  File "/usr/local/lib/python2.7/dist-packages/flake8/plugins/manager.py", line 5, in <module>',
  \   '    import pkg_resources',
  \   '  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 35, in <module>',
  \   '    import email.parser',
  \   'ImportError: No module named parser',
  \ ])

Execute(The flake8 handler should handle names with spaces):
  AssertEqual
  \ [
  \   {
  \     'lnum': 6,
  \     'col': 6,
  \     'type': 'E',
  \     'text': 'indentation is not a multiple of four',
  \     'code': 'E111',
  \     'sub_type': 'style',
  \   },
  \ ],
  \ ale_linters#python#flake8#Handle(42, [
  \   'C:\something\with spaces.py:6:6: E111 indentation is not a multiple of four',
  \ ])

Execute(Warnings about trailing blank lines should be reported by default):
  AssertEqual
  \ [
  \   {
  \     'lnum': 6,
  \     'col': 1,
  \     'code': 'W391',
  \     'type': 'W',
  \     'sub_type': 'style',
  \     'text': 'blank line at end of file',
  \   },
  \ ],
  \ ale_linters#python#flake8#Handle(bufnr(''), [
  \   'foo.py:6:1: W391 blank line at end of file',
  \ ])

Execute(Disabling trailing blank line warnings should work):
  let b:ale_warn_about_trailing_blank_lines = 0

  AssertEqual
  \ [
  \ ],
  \ ale_linters#python#flake8#Handle(bufnr(''), [
  \   'foo.py:6:1: W391 blank line at end of file',
  \ ])