Before:
  Save g:ale_set_lists_synchronously
  Save g:ale_buffer_info
  Save g:ale_lsp_error_messages
  Save g:ale_set_loclist
  Save g:ale_set_signs
  Save g:ale_set_quickfix
  Save g:ale_set_highlights
  Save g:ale_echo_cursor
  Save g:ale_disable_lsp
  Save g:ale_history_enabled
  Save g:ale_history_log_output

  let g:ale_disable_lsp = 0
  let g:ale_set_lists_synchronously = 1
  let g:ale_buffer_info = {}
  let g:ale_set_loclist = 1
  " Disable features we don't need for these tests.
  let g:ale_set_signs = 0
  let g:ale_set_quickfix = 0
  let g:ale_set_highlights = 0
  let g:ale_echo_cursor = 0
  let g:ale_history_enabled = 1
  let g:ale_history_log_output = 1

  unlet! g:ale_lsp_error_messages
  unlet! b:ale_linters
  unlet! b:ale_disable_lsp

  call ale#linter#Reset()
  call ale#test#SetDirectory('/testplugin/test')
  call setloclist(0, [])

After:
  Restore

  unlet! b:ale_linters

  call setloclist(0, [])
  call ale#test#RestoreDirectory()
  call ale#linter#Reset()
  call ale#lsp_linter#ClearLSPData()

Given foobar(An empty file):
Execute(tsserver syntax error responses should be handled correctly):
  runtime ale_linters/typescript/tsserver.vim
  call ale#test#SetFilename('filename.ts')
  call ale#engine#InitBufferInfo(bufnr(''))

  " When we get syntax errors and no semantic errors, we should keep the
  " syntax errors.
  call ale#lsp_linter#HandleLSPResponse(1, {
  \ 'seq': 0,
  \ 'type': 'event',
  \ 'event': 'syntaxDiag',
  \ 'body': {
  \   'file': g:dir . '/filename.ts',
  \   'diagnostics':[
  \     {
  \       'start': {
  \         'line':2,
  \         'offset':14,
  \       },
  \       'end': {
  \         'line':2,
  \         'offset':15,
  \       },
  \       'text': ''','' expected.',
  \       "code":1005
  \     },
  \   ],
  \ },
  \})
  call ale#lsp_linter#HandleLSPResponse(1, {
  \ 'seq': 0,
  \ 'type': 'event',
  \ 'event': 'semanticDiag',
  \ 'body': {
  \   'file': g:dir . '/filename.ts',
  \   'diagnostics':[
  \   ],
  \ },
  \})

  AssertEqual
  \ [
  \   {
  \     'lnum': 1,
  \     'bufnr': bufnr(''),
  \     'col': 14,
  \     'vcol': 0,
  \     'nr': 1005,
  \     'type': 'E',
  \     'text': '1005: '','' expected.',
  \     'valid': 1,
  \     'pattern': '',
  \   },
  \ ],
  \ ale#test#GetLoclistWithoutModule()

  " After we get empty syntax errors, we should clear them.
  call ale#lsp_linter#HandleLSPResponse(1, {
  \ 'seq': 0,
  \ 'type': 'event',
  \ 'event': 'syntaxDiag',
  \ 'body': {
  \   'file': g:dir . '/filename.ts',
  \   'diagnostics':[
  \   ],
  \ },
  \})

  AssertEqual
  \ [
  \ ],
  \ ale#test#GetLoclistWithoutModule()

  " Syntax errors on the project root should not populate the LocList.
  call ale#lsp_linter#HandleLSPResponse(1, {
  \ 'seq': 0,
  \ 'type': 'event',
  \ 'event': 'syntaxDiag',
  \ 'body': {
  \   'file': g:dir,
  \   'diagnostics':[
  \     {
  \       'start': {
  \         'line':2,
  \         'offset':14,
  \       },
  \       'end': {
  \         'line':2,
  \         'offset':15,
  \       },
  \       'text': ''','' expected.',
  \       "code":1005
  \     },
  \   ],
  \ },
  \})

  AssertEqual
  \ [
  \ ],
  \ ale#test#GetLoclistWithoutModule()

Execute(tsserver semantic error responses should be handled correctly):
  runtime ale_linters/typescript/tsserver.vim
  call ale#test#SetFilename('filename.ts')
  call ale#engine#InitBufferInfo(bufnr(''))

  " When we get syntax errors and no semantic errors, we should keep the
  " syntax errors.
  call ale#lsp_linter#HandleLSPResponse(1, {
  \ 'seq': 0,
  \ 'type': 'event',
  \ 'event': 'syntaxDiag',
  \ 'body': {
  \   'file': g:dir . '/filename.ts',
  \   'diagnostics':[
  \   ],
  \ },
  \})
  call ale#lsp_linter#HandleLSPResponse(1, {
  \ 'seq': 0,
  \ 'type': 'event',
  \ 'event': 'semanticDiag',
  \ 'body': {
  \   'file': g:dir . '/filename.ts',
  \   'diagnostics':[
  \     {
  \       'start': {
  \         'line':2,
  \         'offset':14,
  \       },
  \       'end': {
  \         'line':2,
  \         'offset':15,
  \       },
  \       'text': 'Some semantic error',
  \       "code":1005
  \     },
  \   ],
  \ },
  \})

  AssertEqual
  \ [
  \   {
  \     'lnum': 1,
  \     'bufnr': bufnr(''),
  \     'col': 14,
  \     'vcol': 0,
  \     'nr': 1005,
  \     'type': 'E',
  \     'text': '1005: Some semantic error',
  \     'valid': 1,
  \     'pattern': '',
  \   },
  \ ],
  \ ale#test#GetLoclistWithoutModule()

  " After we get empty syntax errors, we should clear them.
  call ale#lsp_linter#HandleLSPResponse(1, {
  \ 'seq': 0,
  \ 'type': 'event',
  \ 'event': 'semanticDiag',
  \ 'body': {
  \   'file': g:dir . '/filename.ts',
  \   'diagnostics':[
  \   ],
  \ },
  \})

  AssertEqual
  \ [
  \ ],
  \ ale#test#GetLoclistWithoutModule()

  " Semantic errors on the project root should not populate the LocList.
  call ale#lsp_linter#HandleLSPResponse(1, {
  \ 'seq': 0,
  \ 'type': 'event',
  \ 'event': 'semanticDiag',
  \ 'body': {
  \   'file': g:dir,
  \   'diagnostics':[
  \     {
  \       'start': {
  \         'line':2,
  \         'offset':14,
  \       },
  \       'end': {
  \         'line':2,
  \         'offset':15,
  \       },
  \       'text': 'Some semantic error',
  \       "code":1005
  \     },
  \   ],
  \ },
  \})

  AssertEqual
  \ [
  \ ],
  \ ale#test#GetLoclistWithoutModule()

Execute(tsserver errors should mark tsserver no longer active):
  let b:ale_linters = ['tsserver']
  runtime ale_linters/typescript/tsserver.vim
  call ale#test#SetFilename('filename.ts')
  call ale#engine#InitBufferInfo(bufnr(''))

  let g:ale_buffer_info[bufnr('')].active_linter_list = ale#linter#Get('typescript')
  Assert !empty(g:ale_buffer_info[bufnr('')].active_linter_list)

  call ale#lsp_linter#HandleLSPResponse(1, {
  \ 'seq': 0,
  \ 'type': 'event',
  \ 'event': 'semanticDiag',
  \ 'body': {
  \   'file': g:dir . '/filename.ts',
  \   'diagnostics':[],
  \ },
  \})

  AssertEqual [], g:ale_buffer_info[bufnr('')].active_linter_list

Execute(LSP diagnostics responses should be handled correctly):
  let b:ale_linters = ['eclipselsp']
  runtime ale_linters/java/eclipselsp.vim
  call ale#test#SetFilename('filename.java')
  call ale#engine#InitBufferInfo(bufnr(''))
  call ale#lsp_linter#SetLSPLinterMap({'1': 'eclipselsp'})

  call ale#lsp_linter#HandleLSPResponse(1, {
  \ 'jsonrpc':'2.0',
  \ 'method':'textDocument/publishDiagnostics',
  \ 'params': {
  \     'uri':'file://' . g:dir . '/filename.java',
  \     'diagnostics': [
  \        {
  \          'range': {
  \             'start': {
  \               'line': 0,
  \               'character':0
  \             },
  \             'end': {
  \               'line': 0,
  \               'character':0
  \             }
  \          },
  \          'severity': 2,
  \          'code': "",
  \          'source': 'Java',
  \          'message': 'Missing JRE 1-8'
  \       }
  \     ]
  \  }
  \})

  AssertEqual
  \ [
  \   {
  \     'lnum': 1,
  \     'bufnr': bufnr(''),
  \     'col': 1,
  \     'pattern': '',
  \     'valid': 1,
  \     'vcol': 0,
  \     'nr': -1,
  \     'type': 'W',
  \     'text': 'Missing JRE 1-8'
  \    }
  \ ],
  \ ale#test#GetLoclistWithoutModule()

Execute(LSP diagnostics responses on project root should not populate loclist):
  let b:ale_linters = ['eclipselsp']
  runtime ale_linters/java/eclipselsp.vim
  call ale#test#SetFilename('filename.java')
  call ale#engine#InitBufferInfo(bufnr(''))
  call ale#lsp_linter#SetLSPLinterMap({'1': 'eclipselsp'})

  call ale#lsp_linter#HandleLSPResponse(1, {
  \ 'jsonrpc':'2.0',
  \ 'method':'textDocument/publishDiagnostics',
  \ 'params': {
  \     'uri':'file://' . g:dir,
  \     'diagnostics': [
  \        {
  \          'range': {
  \             'start': {
  \               'line': 0,
  \               'character':0
  \             },
  \             'end': {
  \               'line': 0,
  \               'character':0
  \             }
  \          },
  \          'severity': 2,
  \          'code': "",
  \          'source': 'Java',
  \          'message': 'Missing JRE 1-8'
  \       }
  \     ]
  \  }
  \})

  AssertEqual
  \ [
  \ ],
  \ ale#test#GetLoclistWithoutModule()

Execute(LSP errors should mark linters no longer active):
  let b:ale_linters = ['pyls']
  runtime ale_linters/python/pyls.vim
  call ale#test#SetFilename('filename.py')
  call ale#engine#InitBufferInfo(bufnr(''))
  call ale#lsp_linter#SetLSPLinterMap({1: 'pyls'})

  let g:ale_buffer_info[bufnr('')].active_linter_list = ale#linter#Get('python')
  Assert !empty(g:ale_buffer_info[bufnr('')].active_linter_list)

  call ale#lsp_linter#HandleLSPResponse(1, {
  \ 'method': 'textDocument/publishDiagnostics',
  \ 'params': {
  \   'uri': ale#path#ToURI(g:dir . '/filename.py'),
  \   'diagnostics': [],
  \ },
  \})

  AssertEqual [], g:ale_buffer_info[bufnr('')].active_linter_list

Execute(LSP errors should be logged in the history):
  call ale#lsp_linter#SetLSPLinterMap({'347': 'foobar'})
  call ale#lsp_linter#HandleLSPResponse(347, {
  \ 'jsonrpc': '2.0',
  \ 'error': {
  \   'code': -32602,
  \   'message': 'xyz',
  \   'data': {
  \     'traceback': ['123', '456'],
  \   },
  \ },
  \})

  AssertEqual
  \ {'foobar': ["xyz\n123\n456"]},
  \ get(g:, 'ale_lsp_error_messages', {})