Before:
  runtime ale_linters/python/mypy.vim

After:
  call ale#linter#Reset()
  silent file something_else.py

Execute(The mypy handler should parse lines correctly):
  silent file foo/bar/__init__.py

  AssertEqual
  \ [
  \   {
  \     'lnum': 15,
  \     'col': 3,
  \     'text': 'Argument 1 to "somefunc" has incompatible type "int"; expected "str"',
  \     'type': 'E',
  \   },
  \   {
  \     'lnum': 72,
  \     'col': 1,
  \     'text': 'Some warning',
  \     'type': 'W',
  \   },
  \ ],
  \ ale_linters#python#mypy#Handle(bufnr(''), [
  \ 'foo/bar/baz.py: note: In class "SomeClass":',
  \ 'foo/bar/baz.py:768:38: error: Cannot determine type of ''SOME_SYMBOL''',
  \ 'foo/bar/baz.py: note: In class "AnotherClass":',
  \ 'foo/bar/baz.py:821:38: error: Cannot determine type of ''SOME_SYMBOL''',
  \ 'foo/bar/__init__.py:92: note: In module imported here:',
  \ 'foo/bar/other.py: note: In class "YetAnotherClass":',
  \ 'foo/bar/other.py:38:44: error: Cannot determine type of ''ANOTHER_SYMBOL''',
  \ 'foo/bar/__init__.py: note: At top level:',
  \ 'foo/bar/__init__.py:15:3: error: Argument 1 to "somefunc" has incompatible type "int"; expected "str"',
  \ 'another_module/bar.py:14: note: In module imported here,',
  \ 'another_module/__init__.py:16: note: ... from here,',
  \ 'foo/bar/__init__.py:72:1: warning: Some warning',
  \ ])

Execute(The mypy handler should handle Windows names with spaces):
  " This test works on Unix, where this is seen as a single filename
  silent file C:\\something\\with\ spaces.py

  AssertEqual
  \ [
  \   {
  \     'lnum': 4,
  \     'col': 0,
  \     'text': "No library stub file for module 'django.db'",
  \     'type': 'E',
  \   },
  \ ],
  \ ale_linters#python#mypy#Handle(bufnr(''), [
  \   'C:\something\with spaces.py:4: error: No library stub file for module ''django.db''',
  \ ])