vim-patch:8.0.0151,3,4 #7389

vim-patch:8.0.0151
Problem:    To pass buffer content to system() and systemlist() one has to
            first create a string or list.
Solution:   Allow passing a buffer number. (LemonBoy,
            closes vim/vim#1240)
https://github.com/vim/vim/commit/12c4492dd35e0cd83c8816be2ec849b836109882

vim-patch:8.0.0153
Problem:    system() test fails on MS-Windows.
Solution:   Deal when extra space and CR.
https://github.com/vim/vim/commit/9d9c35651712b88c81f1ae11091de1fd0bbbd35c

vim-patch:8.0.0154
Problem:    system() test fails on OS/X.
Solution:   Deal with leading spaces.
https://github.com/vim/vim/commit/31f19ce0a052f7c76d44a9a190e468c79cf5d56d

1 files changed, 7 insertions, 3 deletions

diff --git a/test/functional/eval/system_spec.lua b/test/functional/eval/system_spec.lua
index e2b12b6bc9..4d1630042b 100644
--- a/test/functional/eval/system_spec.lua
+++ b/test/functional/eval/system_spec.lua
@@ -5,6 +5,7 @@ local eq, call, clear, eval, feed_command, feed, nvim =
   helpers.eq, helpers.call, helpers.clear, helpers.eval, helpers.feed_command,
   helpers.feed, helpers.nvim
 local command = helpers.command
+local exc_exec = helpers.exc_exec
 local iswin = helpers.iswin
 
 local Screen = require('test.functional.ui.screen')
@@ -274,9 +275,12 @@ describe('system()', function()
     end)
   end)
 
-  describe('input passed as Number', function()
-    it('stringifies the input', function()
-      eq('1', eval('system("cat", 1)'))
+  describe('Number input', function()
+    it('is treated as a buffer id', function()
+      command("put ='text in buffer 1'")
+      eq('\ntext in buffer 1\n', eval('system("cat", 1)'))
+      eq('Vim(echo):E86: Buffer 42 does not exist',
+         exc_exec('echo system("cat", 42)'))
     end)
   end)