functests: Make sure that setting scrollback size works from TermOpen

1 files changed, 28 insertions, 0 deletions

diff --git a/test/functional/terminal/edit_spec.lua b/test/functional/terminal/edit_spec.lua
index 924f90e8f8..1062bb4843 100644
--- a/test/functional/terminal/edit_spec.lua
+++ b/test/functional/terminal/edit_spec.lua
@@ -1,5 +1,8 @@
 local helpers = require('test.functional.helpers')
+local screen = require('test.functional.ui.screen')
 
+local curbufmeths = helpers.curbufmeths
+local curwinmeths = helpers.curwinmeths
 local nvim_dir = helpers.nvim_dir
 local command = helpers.command
 local meths = helpers.meths
@@ -10,6 +13,7 @@ describe(':edit term://*', function()
   before_each(function()
     clear()
     meths.set_option('shell', nvim_dir .. '/shell-test')
+    meths.set_option('shellcmdflag', 'EXE')
   end)
 
   it('runs TermOpen event', function()
@@ -20,4 +24,28 @@ describe(':edit term://*', function()
     eq(1, #termopen_runs)
     eq(termopen_runs[1], termopen_runs[1]:match('^term://.//%d+:$'))
   end)
+
+  it('runs TermOpen early enough to respect terminal_scrollback_buffer_size', function()
+    local rep = 'a'
+    meths.set_option('shellcmdflag', 'REP ' .. rep)
+    local rep_size = rep:byte()
+    local sb = 10
+    local gsb = 20
+    meths.set_var('terminal_scrollback_buffer_size', gsb)
+    command('autocmd TermOpen * :let b:terminal_scrollback_buffer_size = '
+            .. tostring(sb))
+    command('edit term://foobar')
+    local bufcontents = {}
+    local winheight = curwinmeths.get_height()
+    -- I have no idea why there is + 4 needed. But otherwise it works fine with 
+    -- different scrollbacks.
+    local shift = -4
+    for i = (rep_size - 1 - sb - winheight - shift),(rep_size - 1) do
+      bufcontents[#bufcontents + 1] = ('%d: foobar'):format(i)
+    end
+    bufcontents[#bufcontents + 1] = ''
+    bufcontents[#bufcontents + 1] = '[Process exited 0]'
+    command('sleep 500m')
+    eq(bufcontents, curbufmeths.get_line_slice(1, -1, true, true))
+  end)
 end)