Before:
  let g:notified_changes = []

  runtime autoload/ale/lsp.vim

  function! ale#lsp#NotifyForChanges(conn_id, buffer) abort
    call add(g:notified_changes, {
    \ 'conn_id': a:conn_id,
    \ 'buffer': a:buffer
    \})
  endfunction

  Save g:ale_enabled
  let g:ale_enabled = 0

  let g:file1 = tempname()
  let g:file2 = tempname()
  let g:test = {}

  let g:test.create_change = {line, offset, end_line, end_offset, value ->
  \{
  \   'changes': [{
  \      'fileName': g:file1,
  \      'textChanges': [{
  \        'start': {
  \          'line': line,
  \          'offset': offset,
  \        },
  \        'end': {
  \          'line': end_line,
  \          'offset': end_offset,
  \        },
  \        'newText': value,
  \      }],
  \   }]
  \}}

  function! WriteFileAndEdit() abort
    let g:test.text = [
    \ 'class Name {',
    \ '  value: string',
    \ '}',
    \]
    call writefile(g:test.text, g:file1, 'S')
    execute 'edit ' . g:file1
  endfunction!

After:
  " Close the extra buffers if we opened it.
  if bufnr(g:file1) != -1 && buflisted(bufnr(g:file1))
    execute ':bp! | :bd! ' . bufnr(g:file1)
  endif
  if bufnr(g:file2) != -1 && buflisted(bufnr(g:file2))
    execute ':bp! | :bd! ' . bufnr(g:file2)
  endif

  if filereadable(g:file1)
    call delete(g:file1)
  endif
  if filereadable(g:file2)
    call delete(g:file2)
  endif

  unlet! g:notified_changes
  " unlet! g:expected_notified_changes
  unlet! g:file1
  unlet! g:file2
  unlet! g:test
  unlet! g:changes
  delfunction WriteFileAndEdit

  runtime autoload/ale/lsp.vim

  Restore


Execute(It should modify and save multiple files):
  call writefile([
  \ 'class Name {',
  \ '  value: string',
  \ '}',
  \ '',
  \ 'class B {',
  \ '  constructor(readonly a: Name) {}',
  \ '}'
  \], g:file1, 'S')
  call writefile([
  \ 'import A from "A"',
  \ 'import {',
  \ '  B,',
  \ '  C,',
  \ '} from "module"',
  \ 'import D from "D"',
  \], g:file2, 'S')

  call ale#code_action#HandleCodeAction(
  \ {
  \   'changes': [{
  \      'fileName': g:file1,
  \      'textChanges': [{
  \        'start': {
  \          'line': 1,
  \          'offset': 7,
  \        },
  \        'end': {
  \          'line': 1,
  \          'offset': 11,
  \        },
  \        'newText': 'Value',
  \      }, {
  \        'start': {
  \          'line': 6,
  \          'offset': 27,
  \        },
  \        'end': {
  \          'line': 6,
  \          'offset': 31,
  \        },
  \        'newText': 'Value',
  \      }],
  \   }, {
  \     'fileName': g:file2,
  \     'textChanges': [{
  \       'start': {
  \         'line': 2,
  \         'offset': 1,
  \       },
  \       'end': {
  \         'line': 6,
  \         'offset': 1,
  \       },
  \       'newText': "import {A, B} from 'module'\n\n",
  \     }]
  \   }],
  \ },
  \ {'should_save': 1, 'conn_id': 'test_conn'},
  \)

  AssertEqual [
  \ 'class Value {',
  \ '  value: string',
  \ '}',
  \ '',
  \ 'class B {',
  \ '  constructor(readonly a: Value) {}',
  \ '}',
  \ '',
  \], readfile(g:file1, 'b')

  AssertEqual [
  \ 'import A from "A"',
  \ 'import {A, B} from ''module''',
  \ '',
  \ 'import D from "D"',
  \ '',
  \], readfile(g:file2, 'b')

  AssertEqual [{
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(g:file1),
  \}, {
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(g:file2),
  \}], g:notified_changes

Execute(Beginning of file can be modified):
  let g:test.text = [
  \ 'class Name {',
  \ '  value: string',
  \ '}',
  \]
  call writefile(g:test.text, g:file1, 'S')

  call ale#code_action#HandleCodeAction(
  \ {
  \   'changes': [{
  \      'fileName': g:file1,
  \      'textChanges': [{
  \        'start': {
  \          'line': 1,
  \          'offset': 1,
  \        },
  \        'end': {
  \          'line': 1,
  \          'offset': 1,
  \        },
  \        'newText': "type A: string\ntype B: number\n",
  \      }],
  \   }]
  \ },
  \ {'should_save': 1, 'conn_id': 'test_conn'},
  \)

  AssertEqual [
  \  'type A: string',
  \  'type B: number',
  \] + g:test.text + [''], readfile(g:file1, 'b')

  AssertEqual [{
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(g:file1),
  \}], g:notified_changes


Execute(End of file can be modified):
  let g:test.text = [
  \ 'class Name {',
  \ '  value: string',
  \ '}',
  \]
  call writefile(g:test.text, g:file1, 'S')

  call ale#code_action#HandleCodeAction(
  \ {
  \   'changes': [{
  \    'fileName': g:file1,
  \    'textChanges': [{
  \      'start': {
  \        'line': 4,
  \        'offset': 1,
  \      },
  \      'end': {
  \        'line': 4,
  \        'offset': 1,
  \      },
  \      'newText': "type A: string\ntype B: number\n",
  \     }],
  \   }]
  \ },
  \ {'should_save': 1, 'conn_id': 'test_conn'},
  \)

  AssertEqual g:test.text + [
  \  'type A: string',
  \  'type B: number',
  \  '',
  \], readfile(g:file1, 'b')

  AssertEqual [{
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(g:file1),
  \}], g:notified_changes


Execute(Current buffer contents will be reloaded):
  let g:test.text = [
  \ 'class Name {',
  \ '  value: string',
  \ '}',
  \]
  call writefile(g:test.text, g:file1, 'S')

  execute 'edit ' . g:file1
  let g:test.buffer = bufnr(g:file1)

  call ale#code_action#HandleCodeAction(
  \ {
  \   'changes': [{
  \      'fileName': g:file1,
  \      'textChanges': [{
  \        'start': {
  \          'line': 1,
  \          'offset': 1,
  \        },
  \        'end': {
  \          'line': 1,
  \          'offset': 1,
  \        },
  \        'newText': "type A: string\ntype B: number\n",
  \      }],
  \   }]
  \ },
  \ {'should_save': 1, 'conn_id': 'test_conn'},
  \)

  AssertEqual [
  \  'type A: string',
  \  'type B: number',
  \] + g:test.text + [''], readfile(g:file1, 'b')

  AssertEqual [
  \  'type A: string',
  \  'type B: number',
  \] + g:test.text, getbufline(g:test.buffer, 1, '$')

  AssertEqual [{
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(g:file1),
  \}], g:notified_changes


Execute(Unlisted buffer contents will be modified correctly):
  let g:test.text = [
  \ 'class Name {',
  \ '  value: string',
  \ '}',
  \]
  call writefile(g:test.text, g:file1, 'S')

  execute 'edit ' . g:file1
  let g:test.buffer = bufnr(g:file1)

  execute 'bd'
  AssertEqual bufnr(g:file1), g:test.buffer

  call ale#code_action#HandleCodeAction(
  \ {
  \   'changes': [{
  \      'fileName': g:file1,
  \      'textChanges': [{
  \        'start': {
  \          'line': 1,
  \          'offset': 1,
  \        },
  \        'end': {
  \          'line': 1,
  \          'offset': 1,
  \        },
  \        'newText': "type A: string\ntype B: number\n",
  \      }],
  \   }]
  \ },
  \ {'should_save': 1, 'conn_id': 'test_conn'},
  \)

  AssertEqual [
  \  'type A: string',
  \  'type B: number',
  \] + g:test.text + [''], readfile(g:file1, 'b')

  AssertEqual [{
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(g:file1),
  \}], g:notified_changes

# Tests for cursor repositioning. In comments `=` designates change range, and
# `C` cursor position

#     C ===
Execute(Cursor will not move when it is before text change):
  call WriteFileAndEdit()
  let g:test.changes = g:test.create_change(2, 3, 2, 8, 'value2')

  call setpos('.', [0, 1, 1, 0])
  call ale#code_action#HandleCodeAction(g:test.changes, {
  \ 'should_save': 1,
  \ 'conn_id': 'test_conn',
  \})
  AssertEqual [1, 1], getpos('.')[1:2]

  AssertEqual [{
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(''),
  \}], g:notified_changes

  call setpos('.', [0, 2, 2, 0])
  call ale#code_action#HandleCodeAction(g:test.changes, {
  \ 'should_save': 1,
  \ 'conn_id': 'test_conn',
  \})
  AssertEqual [2, 2], getpos('.')[1:2]

  AssertEqual [{
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(''),
  \}, {
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(''),
  \}], g:notified_changes

# ====C====
Execute(Cursor column will move to the change end when cursor between start/end):
  let g:test.changes = g:test.create_change(2, 3, 2, 8, 'value2')

  for r in range(3, 8)
    call WriteFileAndEdit()
    call setpos('.', [0, 2, r, 0])
    AssertEqual '  value: string', getline('.')
    call ale#code_action#HandleCodeAction(g:test.changes, {
    \ 'should_save': 1,
    \ 'conn_id': 'test_conn',
    \})
    AssertEqual '  value2: string', getline('.')
    AssertEqual [2, 9], getpos('.')[1:2]
  endfor

  AssertEqual [{
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(''),
  \}, {
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(''),
  \}, {
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(''),
  \}, {
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(''),
  \}, {
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(''),
  \}, {
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(''),
  \}], g:notified_changes


# ====C
Execute(Cursor column will move back when new text is shorter):
  call WriteFileAndEdit()
  call setpos('.', [0, 2, 8, 0])
  AssertEqual '  value: string', getline('.')
  call ale#code_action#HandleCodeAction(
  \ g:test.create_change(2, 3, 2, 8, 'val'),
  \ {
  \   'should_save': 1,
  \   'conn_id': 'test_conn',
  \ })
  AssertEqual '  val: string', getline('.')
  AssertEqual [2, 6], getpos('.')[1:2]

  AssertEqual [{
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(''),
  \}], g:notified_changes


# ==== C
Execute(Cursor column will move forward when new text is longer):
  call WriteFileAndEdit()

  call setpos('.', [0, 2, 8, 0])
  AssertEqual '  value: string', getline('.')
  call ale#code_action#HandleCodeAction(
  \ g:test.create_change(2, 3, 2, 8, 'longValue'),
  \ {
  \   'should_save': 1,
  \   'conn_id': 'test_conn',
  \ })
  AssertEqual '  longValue: string', getline('.')
  AssertEqual [2, 12], getpos('.')[1:2]

  AssertEqual [{
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(''),
  \}], g:notified_changes

# =========
# =
# C
Execute(Cursor line will move when updates are happening on lines above):
  call WriteFileAndEdit()
  call setpos('.', [0, 3, 1, 0])
  AssertEqual '}', getline('.')
  call ale#code_action#HandleCodeAction(
  \ g:test.create_change(1, 1, 2, 1, "test\ntest\n"),
  \ {
  \   'should_save': 1,
  \   'conn_id': 'test_conn',
  \ })
  AssertEqual '}', getline('.')
  AssertEqual [4, 1], getpos('.')[1:2]

  AssertEqual [{
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(''),
  \}], g:notified_changes


# =========
# =C
Execute(Cursor line and column will move when change on lines above and just before cursor column):
  call WriteFileAndEdit()
  call setpos('.', [0, 2, 2, 0])
  AssertEqual '  value: string', getline('.')
  call ale#code_action#HandleCodeAction(
  \ g:test.create_change(1, 1, 2, 1, "test\ntest\n123"),
  \ {
  \   'should_save': 1,
  \   'conn_id': 'test_conn',
  \ })
  AssertEqual '123  value: string', getline('.')
  AssertEqual [3, 5], getpos('.')[1:2]

  AssertEqual [{
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(''),
  \}], g:notified_changes

# =========
# ======C==
# =
Execute(Cursor line and column will move at the end of changes):
  call WriteFileAndEdit()
  call setpos('.', [0, 2, 10, 0])
  AssertEqual '  value: string', getline('.')
  call ale#code_action#HandleCodeAction(
  \ g:test.create_change(1, 1, 3, 1, "test\n"),
  \ {
  \   'should_save': 1,
  \   'conn_id': 'test_conn',
  \ })
  AssertEqual '}', getline('.')
  AssertEqual [2, 1], getpos('.')[1:2]

  AssertEqual [{
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(''),
  \}], g:notified_changes

#      C ==
# ===
Execute(Cursor will not move when changes happening on lines >= cursor, but after cursor):
  call WriteFileAndEdit()
  call setpos('.', [0, 2, 3, 0])
  AssertEqual '  value: string', getline('.')
  call ale#code_action#HandleCodeAction(
  \ g:test.create_change(2, 10, 3, 1, "number\n"),
  \ {
  \   'should_save': 1,
  \   'conn_id': 'test_conn',
  \ })
  AssertEqual '  value: number', getline('.')
  AssertEqual [2, 3], getpos('.')[1:2]

  AssertEqual [{
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(''),
  \}], g:notified_changes

Execute(Cursor will not move when change covers entire file):
  call WriteFileAndEdit()
  call setpos('.', [0, 2, 3, 0])
  call ale#code_action#HandleCodeAction(
  \ g:test.create_change(1, 1, len(g:test.text) + 1, 1,
  \   join(g:test.text + ['x'], "\n")),
  \ {
  \   'should_save': 1,
  \   'conn_id': 'test_conn',
  \ })
  AssertEqual [2, 3], getpos('.')[1:2]

  AssertEqual [{
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(''),
  \}], g:notified_changes

Execute(It should just modify file when should_save is set to v:false):
  call WriteFileAndEdit()
  let g:test.change = g:test.create_change(1, 1, 1, 1, "import { writeFile } from 'fs';\n")
  call ale#code_action#HandleCodeAction(g:test.change, {
  \ 'conn_id': 'test_conn',
  \})
  AssertEqual 1, getbufvar(bufnr(''), '&modified')
  AssertEqual [
  \ 'import { writeFile } from ''fs'';',
  \ 'class Name {',
  \ '  value: string',
  \ '}',
  \], getline(1, '$')

  AssertEqual [{
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(''),
  \}], g:notified_changes

Given typescript(An example TypeScript file):
  type Foo = {}

  export interface ISomething {
    fooLongName: Foo | null
  }

  export class SomethingElse implements ISomething {
    // Bindings
    fooLongName!: ISomething['fooLongName']
  }

Execute():
  let g:changes = [
  \ {'end': {'offset': 14, 'line': 4}, 'newText': 'foo', 'start': {'offset': 3, 'line': 4}},
  \ {'end': {'offset': 40, 'line': 9}, 'newText': 'foo', 'start': {'offset': 29, 'line': 9}},
  \ {'end': {'offset': 14, 'line': 9}, 'newText': 'foo', 'start': {'offset': 3, 'line': 9}},
  \]

  call ale#code_action#ApplyChanges(expand('%:p'), g:changes, {
  \ 'conn_id': 'test_conn',
  \})

  AssertEqual [{
  \ 'conn_id': 'test_conn',
  \ 'buffer': bufnr(''),
  \}], g:notified_changes

Expect(The changes should be applied correctly):
  type Foo = {}

  export interface ISomething {
    foo: Foo | null
  }

  export class SomethingElse implements ISomething {
    // Bindings
    foo!: ISomething['foo']
  }