Before:
  runtime ale_linters/go/gotype.vim
  call ale#test#SetFilename('../go_files/testfile2.go')

After:
  call ale#linter#Reset()

Execute(The default gotype command should be correct):
  AssertEqual 'cd ' . ale#Escape(expand('%:p:h')) . ' && '
  \ . ' gotype .',
  \ ale_linters#go#gotype#GetCommand(bufnr(''))

Execute(The gotype callback should ignore test files):
  call ale#test#SetFilename('bla_test.go')
  AssertEqual 0, ale_linters#go#gotype#GetCommand(bufnr(''))