vim-patch:8.2.1505: not all file read and writecode is tested

Problem:    Not all file read and writecode is tested.
Solution:   Add a few tests. (Dominique Pellé, closes vim/vim#6764)
https://github.com/vim/vim/commit/1b04ce2d400fda97410a961288c496bd8f445a9c

Cherry-pick Test_glob() from patch 8.2.0634.

1 files changed, 19 insertions, 6 deletions

diff --git a/src/nvim/testdir/test_eval_stuff.vim b/src/nvim/testdir/test_eval_stuff.vim
index eff1376d3c..351120bf11 100644
--- a/src/nvim/testdir/test_eval_stuff.vim
+++ b/src/nvim/testdir/test_eval_stuff.vim
@@ -91,18 +91,31 @@ func Test_readfile_binary()
   new
   call setline(1, ['one', 'two', 'three'])
   setlocal ff=dos
-  silent write XReadfile
-  let lines = readfile('XReadfile')
+  silent write XReadfile_bin
+  let lines = 'XReadfile_bin'->readfile()
   call assert_equal(['one', 'two', 'three'], lines)
-  let lines = readfile('XReadfile', '', 2)
+  let lines = readfile('XReadfile_bin', '', 2)
   call assert_equal(['one', 'two'], lines)
-  let lines = readfile('XReadfile', 'b')
+  let lines = readfile('XReadfile_bin', 'b')
   call assert_equal(["one\r", "two\r", "three\r", ""], lines)
-  let lines = readfile('XReadfile', 'b', 2)
+  let lines = readfile('XReadfile_bin', 'b', 2)
   call assert_equal(["one\r", "two\r"], lines)
 
   bwipe!
-  call delete('XReadfile')
+  call delete('XReadfile_bin')
+endfunc
+
+func Test_readfile_bom()
+  call writefile(["\ufeffFOO", "FOO\ufeffBAR"], 'XReadfile_bom')
+  call assert_equal(['FOO', 'FOOBAR'], readfile('XReadfile_bom'))
+  call delete('XReadfile_bom')
+endfunc
+
+func Test_readfile_max()
+  call writefile(range(1, 4), 'XReadfile_max')
+  call assert_equal(['1', '2'], readfile('XReadfile_max', '', 2))
+  call assert_equal(['3', '4'], readfile('XReadfile_max', '', -2))
+  call delete('XReadfile_max')
 endfunc
 
 func Test_let_errmsg()