" Tests for the history functions

if !has('cmdline_hist')
  finish
endif

set history=7

function History_Tests(hist)
  " First clear the history
  call histadd(a:hist, 'dummy')
  call assert_true(histdel(a:hist))
  call assert_equal(-1, histnr(a:hist))
  call assert_equal('', histget(a:hist))

  call assert_true(histadd(a:hist, 'ls'))
  call assert_true(histadd(a:hist, 'buffers'))
  call assert_equal('buffers', histget(a:hist))
  call assert_equal('ls', histget(a:hist, -2))
  call assert_equal('ls', histget(a:hist, 1))
  call assert_equal('', histget(a:hist, 5))
  call assert_equal('', histget(a:hist, -5))
  call assert_equal(2, histnr(a:hist))
  call assert_true(histdel(a:hist, 2))
  call assert_false(histdel(a:hist, 7))
  call assert_equal(1, histnr(a:hist))
  call assert_equal('ls', histget(a:hist, -1))

  call assert_true(histadd(a:hist, 'buffers'))
  call assert_true(histadd(a:hist, 'ls'))
  call assert_equal('ls', histget(a:hist, -1))
  call assert_equal(4, histnr(a:hist))

  " Test for removing entries matching a pattern
  for i in range(1, 3)
      call histadd(a:hist, 'text_' . i)
  endfor
  call assert_true(histdel(a:hist, 'text_\d\+'))
  call assert_equal('ls', histget(a:hist, -1))

  " Test for freeing the entire history list
  for i in range(1, 7)
      call histadd(a:hist, 'text_' . i)
  endfor
  call histdel(a:hist)
  for i in range(1, 7)
    call assert_equal('', histget(a:hist, i))
    call assert_equal('', histget(a:hist, i - 7 - 1))
  endfor
endfunction

function Test_History()
  for h in ['cmd', ':', '', 'search', '/', '?', 'expr', '=', 'input', '@', 'debug', '>']
    call History_Tests(h)
  endfor

  " Negative tests
  call assert_false(histdel('abc'))
  call assert_equal('', histget('abc'))
  call assert_fails('call histdel([])', 'E730:')
  call assert_equal('', histget(10))
  call assert_fails('call histget([])', 'E730:')
  call assert_equal(-1, histnr('abc'))
  call assert_fails('call histnr([])', 'E730:')
endfunction