Before: Save g:ale_python_mypy_ignore_invalid_syntax unlet! g:ale_python_mypy_ignore_invalid_syntax runtime ale_linters/python/mypy.vim call ale#test#SetDirectory('/testplugin/test/handler') After: Restore call ale#test#RestoreDirectory() call ale#linter#Reset() Execute(The mypy handler should parse lines correctly): call ale#test#SetFilename('__init__.py') AssertEqual \ [ \ { \ 'lnum': 768, \ 'col': 38, \ 'filename': ale#path#Simplify(g:dir . '/baz.py'), \ 'type': 'E', \ 'text': 'Cannot determine type of ''SOME_SYMBOL''', \ }, \ { \ 'lnum': 821, \ 'col': 38, \ 'filename': ale#path#Simplify(g:dir . '/baz.py'), \ 'type': 'E', \ 'text': 'Cannot determine type of ''SOME_SYMBOL''', \ }, \ { \ 'lnum': 38, \ 'col': 44, \ 'filename': ale#path#Simplify(g:dir . '/other.py'), \ 'type': 'E', \ 'text': 'Cannot determine type of ''ANOTHER_SYMBOL''', \ }, \ { \ 'lnum': 15, \ 'col': 3, \ 'filename': ale#path#Simplify(g:dir . '/__init__.py'), \ 'type': 'E', \ 'text': 'Argument 1 to "somefunc" has incompatible type "int"; expected "str"' \ }, \ { \ 'lnum': 72, \ 'col': 1, \ 'filename': ale#path#Simplify(g:dir . '/__init__.py'), \ 'type': 'W', \ 'text': 'Some warning', \ }, \ ], \ ale_linters#python#mypy#Handle(bufnr(''), [ \ 'baz.py: note: In class "SomeClass":', \ 'baz.py:768:38: error: Cannot determine type of ''SOME_SYMBOL''', \ 'baz.py: note: In class "AnotherClass":', \ 'baz.py:821:38: error: Cannot determine type of ''SOME_SYMBOL''', \ '__init__.py:92: note: In module imported here:', \ 'other.py: note: In class "YetAnotherClass":', \ 'other.py:38:44: error: Cannot determine type of ''ANOTHER_SYMBOL''', \ '__init__.py: note: At top level:', \ '__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,', \ '__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, \ 'filename': 'C:\something\with spaces.py', \ 'type': 'E', \ 'text': 'No library stub file for module ''django.db''', \ }, \ ], \ ale_linters#python#mypy#Handle(bufnr(''), [ \ 'C:\something\with spaces.py:4: error: No library stub file for module ''django.db''', \ ]) Execute(The mypy syntax errors shouldn't be ignored by default): AssertEqual \ [ \ { \ 'lnum': 4, \ 'col': 0, \ 'filename': ale#path#Simplify(g:dir . '/foo.py'), \ 'type': 'E', \ 'text': 'invalid syntax', \ }, \ ], \ ale_linters#python#mypy#Handle(bufnr(''), [ \ 'foo.py:4: error: invalid syntax', \ ]) Execute(The mypy syntax errors should be ignored when the option is on): let g:ale_python_mypy_ignore_invalid_syntax = 1 AssertEqual \ [], \ ale_linters#python#mypy#Handle(bufnr(''), [ \ 'foo.py:4: error: invalid syntax', \ ])