ale/test/sign/test_sign_column_highlighting.vader

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Before:
function! ParseSignColumnHighlight() abort
redir => l:output
silent highlight SignColumn
redir end
return join(split(l:output)[2:])
endfunction
let g:sign_highlight = ParseSignColumnHighlight()
After:
delfunction ParseSignColumnHighlight
execute 'highlight SignColumn ' . g:sign_highlight
unlet! g:sign_highlight
Execute(The SignColumn highlight should be set and reset):
call ale#sign#SetSignColumnHighlight(1)
AssertEqual 'links to ALESignColumnWithErrors', ParseSignColumnHighlight()
call ale#sign#SetSignColumnHighlight(0)
AssertEqual 'links to ALESignColumnWithoutErrors', ParseSignColumnHighlight()