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" Test :z
func Test_z()
call setline(1, range(1, 100))
let a = execute('20z3')
call assert_equal("\n20\n21\n22", a)
call assert_equal(22, line('.'))
" 'window' should be set to the {count} value.
call assert_equal(3, &window)
" If there is only one window, then twice the amount of 'scroll' is used.
set scroll=2
let a = execute('20z')
call assert_equal("\n20\n21\n22\n23", a)
call assert_equal(23, line('.'))
let a = execute('20z+3')
" FIXME: I would expect the same result as '20z3' but it
" gives "\n21\n22\n23" instead. Bug in Vim or in ":help :z"?
"call assert_equal("\n20\n21\n22", a)
"call assert_equal(22, line('.'))
let a = execute('20z-3')
call assert_equal("\n18\n19\n20", a)
call assert_equal(20, line('.'))
let a = execute('20z=3')
call assert_match("^\n18\n19\n-\\+\n20\n-\\+\n21\n22$", a)
call assert_equal(20, line('.'))
let a = execute('20z^3')
call assert_equal("\n14\n15\n16\n17", a)
call assert_equal(17, line('.'))
let a = execute('20z.3')
call assert_equal("\n19\n20\n21", a)
call assert_equal(21, line('.'))
let a = execute('20z#3')
call assert_equal("\n 20 20\n 21 21\n 22 22", a)
call assert_equal(22, line('.'))
let a = execute('20z#-3')
call assert_equal("\n 18 18\n 19 19\n 20 20", a)
call assert_equal(20, line('.'))
let a = execute('20z#=3')
call assert_match("^\n 18 18\n 19 19\n-\\+\n 20 20\n-\\+\n 21 21\n 22 22$", a)
call assert_equal(20, line('.'))
" Test with {count} bigger than the number of lines in buffer.
let a = execute('20z1000')
call assert_match("^\n20\n21\n.*\n99\n100$", a)
call assert_equal(100, line('.'))
let a = execute('20z-1000')
call assert_match("^\n1\n2\n.*\n19\n20$", a)
call assert_equal(20, line('.'))
let a = execute('20z=1000')
call assert_match("^\n1\n.*\n-\\+\n20\n-\\\+\n.*\n100$", a)
call assert_equal(20, line('.'))
call assert_fails('20z=a', 'E144:')
set window& scroll&
bw!
endfunc
func Test_z_overflow()
" This used to access invalid memory as a result of an integer overflow
" and freeze vim.
normal ox
normal Heat
z777777776666666
')
endfunc
func Test_z_negative_lnum()
new
z^
call assert_equal(1, line('.'))
bwipe!
endfunc
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