Before:
  runtime ale_linters/sh/shell.vim
  runtime ale_linters/sh/shellcheck.vim

After:
  call ale#linter#Reset()

  unlet! b:is_bash
  unlet! b:is_sh
  unlet! b:is_kornshell

Given(A file with a Bash hashbang):
  #!/bin/bash

Execute(/bin/bash should be detected appropriately):
  AssertEqual 'bash', ale#handlers#sh#GetShellType(bufnr(''))
  AssertEqual 'bash', ale_linters#sh#shell#GetExecutable(bufnr(''))
  AssertEqual 'bash', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Given(A file with /bin/sh):
  #!/usr/bin/env sh -eu --foobar

Execute(/bin/sh should be detected appropriately):
  AssertEqual 'sh', ale#handlers#sh#GetShellType(bufnr(''))
  AssertEqual 'sh', ale_linters#sh#shell#GetExecutable(bufnr(''))
  AssertEqual 'sh', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Given(A file with bash as an argument to env):
  #!/usr/bin/env bash

Execute(/usr/bin/env bash should be detected appropriately):
  AssertEqual 'bash', ale#handlers#sh#GetShellType(bufnr(''))
  AssertEqual 'bash', ale_linters#sh#shell#GetExecutable(bufnr(''))
  AssertEqual 'bash', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Given(A file with a tcsh hash bang and arguments):
  #!/usr/bin/env tcsh -eu --foobar

Execute(tcsh should be detected appropriately):
  AssertEqual 'tcsh', ale#handlers#sh#GetShellType(bufnr(''))
  AssertEqual 'tcsh', ale_linters#sh#shell#GetExecutable(bufnr(''))
  AssertEqual 'tcsh', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Given(A file with a zsh hash bang and arguments):
  #!/usr/bin/env zsh -eu --foobar

Execute(zsh should be detected appropriately):
  AssertEqual 'zsh', ale#handlers#sh#GetShellType(bufnr(''))
  AssertEqual 'zsh', ale_linters#sh#shell#GetExecutable(bufnr(''))
  AssertEqual 'zsh', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Given(A file with a csh hash bang and arguments):
  #!/usr/bin/env csh -eu --foobar

Execute(csh should be detected appropriately):
  AssertEqual 'csh', ale#handlers#sh#GetShellType(bufnr(''))
  AssertEqual 'csh', ale_linters#sh#shell#GetExecutable(bufnr(''))
  AssertEqual 'csh', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Given(A file with a ksh hashbang):
  #!/bin/ksh

Execute(/bin/ksh should be detected appropriately):
  AssertEqual 'ksh', ale#handlers#sh#GetShellType(bufnr(''))
  AssertEqual 'ksh', ale_linters#sh#shell#GetExecutable(bufnr(''))
  AssertEqual 'ksh', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Given(A file with a ksh as an argument to env):
  #!/usr/bin/env ksh

Execute(ksh should be detected appropriately):
  AssertEqual 'ksh', ale#handlers#sh#GetShellType(bufnr(''))
  AssertEqual 'ksh', ale_linters#sh#shell#GetExecutable(bufnr(''))
  AssertEqual 'ksh', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Given(A file with a sh hash bang and arguments):
  #!/usr/bin/env sh -eu --foobar

Execute(sh should be detected appropriately):
  AssertEqual 'sh', ale#handlers#sh#GetShellType(bufnr(''))
  AssertEqual 'sh', ale_linters#sh#shell#GetExecutable(bufnr(''))
  AssertEqual 'sh', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Given(A file without a hashbang):

Execute(The bash dialect should be used for shellcheck if b:is_bash is 1):
  let b:is_bash = 1

  AssertEqual 'bash', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Execute(The sh dialect should be used for shellcheck if b:is_sh is 1):
  let b:is_sh = 1

  AssertEqual 'sh', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Execute(The ksh dialect should be used for shellcheck if b:is_kornshell is 1):
  let b:is_kornshell = 1

  AssertEqual 'ksh', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Execute(The filetype should be used as the default shell type when there is no hashbang line):
  set filetype=zsh
  AssertEqual 'zsh', ale#handlers#sh#GetShellType(bufnr(''))

  set filetype=tcsh
  AssertEqual 'tcsh', ale#handlers#sh#GetShellType(bufnr(''))

  set filetype=python
  AssertEqual '', ale#handlers#sh#GetShellType(bufnr(''))

Given(A file with /bin/ash):
  #!/bin/ash

Execute(The ash dialect should be used for the shell and the base function):
  AssertEqual 'ash', ale#handlers#sh#GetShellType(bufnr(''))
  AssertEqual 'ash', ale_linters#sh#shell#GetExecutable(bufnr(''))

Execute(dash should be used for shellcheck, which has no ash dialect):
  AssertEqual 'dash', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Given(A file with /bin/dash):
  #!/bin/dash

Execute(The dash dialect should be used for the shell and the base function):
  AssertEqual 'dash', ale#handlers#sh#GetShellType(bufnr(''))
  AssertEqual 'dash', ale_linters#sh#shell#GetExecutable(bufnr(''))

Execute(dash should be used for shellcheck):
  AssertEqual 'dash', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Given(A file with a Bash shellcheck shell directive):
  # shellcheck shell=bash

Execute(bash dialect should be detected appropriately):
  AssertEqual 'bash', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Given(A file with a sh shellcheck shell directive):
  #shellcheck   shell=sh

Execute(sh dialect should be detected appropriately):
  AssertEqual 'sh', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Given(A file with a tcsh shellcheck shell directive):
  #   shellcheck   shell=tcsh

Execute(tcsh dialect should be detected appropriately):
  AssertEqual 'tcsh', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Given(A file with a zsh shellcheck shell directive):
  #   shellcheck shell=zsh

Execute(zsh dialect should be detected appropriately):
  AssertEqual 'zsh', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Given(A file with a csh shellcheck shell directive):
  # shellcheck shell=csh

Execute(zsh dialect should be detected appropriately):
  AssertEqual 'csh', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Given(A file with a ksh shellcheck shell directive):
  # shellcheck shell=ksh

Execute(ksh dialect should be detected appropriately):
  AssertEqual 'ksh', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Given(A file with a dash shellcheck shell directive):
  # shellcheck shell=dash

Execute(dash dialect should be detected appropriately):
  AssertEqual 'dash', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))

Given(A file with a ash shellcheck shell directive):
  # shellcheck shell=ash

Execute(dash dialect should be detected for ash that shellcheck does not support):
  AssertEqual 'dash', ale#handlers#shellcheck#GetDialectArgument(bufnr(''))