Describe parts.vim

  It overwrItes existing values
    call airline#parts#define('foo', { 'test': '123' })
    Assert Equals(airline#parts#get('foo').test, '123')
    call airline#parts#define('foo', { 'test': '321' })
    Assert Equals(airline#parts#get('foo').test, '321')
  End

  It can define a function part
    call airline#parts#define_function('func', 'bar')
    Assert Equals(airline#parts#get('func').function, 'bar')
  End

  It can define a text part
    call airline#parts#define_text('text', 'bar')
    Assert Equals(airline#parts#get('text').text, 'bar')
  End

  It can define a raw part
    call airline#parts#define_raw('raw', 'bar')
    Assert Equals(airline#parts#get('raw').raw, 'bar')
  End

  It can define a minwidth
    call airline#parts#define_minwidth('mw', 123)
    Assert Equals(airline#parts#get('mw').minwidth, 123)
  End

  It can define a condition
    call airline#parts#define_condition('part', '1')
    Assert Equals(airline#parts#get('part').condition, '1')
  End

  It can define a accent
    call airline#parts#define_accent('part', 'red')
    Assert Equals(airline#parts#get('part').accent, 'red')
  End

  It value should be blank
    Assert Equals(airline#parts#filetype(), '')
  End

  It can overwrIte a filetype
    set ft=aaa
    Assert Equals(airline#parts#filetype(), 'aaa')
  End

  It can overwrite a filetype
    "GItHub actions's vim's column is smaller than 90
    set ft=aaaa
    if &columns >= 90
      Assert Equals(airline#parts#filetype(), 'aaaa')
    else
      Assert Equals(airline#parts#filetype(), 'aaa…')
    endif
  End
End