Patch 8.2.2973
Problem:    Fix for recovery and diff mode not tested.
Solution:   Add a few more tests. (Yegappan Lakshmanan, closes #8352)
Files:      src/testdir/test_diffmode.vim, src/testdir/test_prompt_buffer.vim,
            src/testdir/test_recover.vim


*** ../vim-8.2.2972/src/testdir/test_diffmode.vim       2021-05-24 
14:20:50.551669187 +0200
--- src/testdir/test_diffmode.vim       2021-06-10 21:48:27.074136064 +0200
***************
*** 243,248 ****
--- 243,278 ----
    bwipe! b
  endfunc
  
+ " Test for :diffget/:diffput with a range that is inside a diff chunk
+ func Test_diffget_diffput_range()
+   call setline(1, range(1, 10))
+   new
+   call setline(1, range(11, 20))
+   windo diffthis
+   3,5diffget
+   call assert_equal(['13', '14', '15'], getline(3, 5))
+   call setline(1, range(1, 10))
+   4,8diffput
+   wincmd p
+   call assert_equal(['13', '4', '5', '6', '7', '8', '19'], getline(3, 9))
+   %bw!
+ endfunc
+ 
+ " Test for :diffget/:diffput with an empty buffer and a non-empty buffer
+ func Test_diffget_diffput_empty_buffer()
+   %d _
+   new
+   call setline(1, 'one')
+   windo diffthis
+   diffget
+   call assert_equal(['one'], getline(1, '$'))
+   %d _
+   diffput
+   wincmd p
+   call assert_equal([''], getline(1, '$'))
+   %bw!
+ endfunc
+ 
  " :diffput and :diffget completes names of buffers which
  " are in diff mode and which are different then current buffer.
  " No completion when the current window is not in diff mode.
***************
*** 329,335 ****
    call assert_equal('10', getline('.'))
    21
    call assert_equal('two', getline('.'))
!   diffget one
    call assert_equal('20', getline('.'))
  
    31
--- 359,365 ----
    call assert_equal('10', getline('.'))
    21
    call assert_equal('two', getline('.'))
!   diffget one 
    call assert_equal('20', getline('.'))
  
    31
***************
*** 645,651 ****
--- 675,685 ----
    call assert_equal(normattr, screenattr(1, 1))
    call assert_equal(normattr, screenattr(2, 1))
    call assert_notequal(normattr, screenattr(3, 1))
+   diffoff!
  
+   " Try using an non-existing function for 'diffexpr'.
+   set diffexpr=NewDiffFunc()
+   call assert_fails('windo diffthis', ['E117:', 'E97:'])
    diffoff!
    %bwipe!
    set diffexpr& diffopt&
***************
*** 1220,1224 ****
--- 1254,1341 ----
    call delete('Xtest_diff_cuc')
  endfunc
  
+ " Test for adding/removing lines inside diff chunks, between diff chunks
+ " and before diff chunks
+ func Test_diff_modify_chunks()
+   enew!
+   let w2_id = win_getid()
+   call setline(1, ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i'])
+   new
+   let w1_id = win_getid()
+   call setline(1, ['a', '2', '3', 'd', 'e', 'f', '7', '8', 'i'])
+   windo diffthis
+ 
+   " remove a line between two diff chunks and create a new diff chunk
+   call win_gotoid(w2_id)
+   5d
+   call win_gotoid(w1_id)
+   call diff_hlID(5, 1)->synIDattr('name')->assert_equal('DiffAdd')
+ 
+   " add a line between two diff chunks
+   call win_gotoid(w2_id)
+   normal! 4Goe
+   call win_gotoid(w1_id)
+   call diff_hlID(4, 1)->synIDattr('name')->assert_equal('')
+   call diff_hlID(5, 1)->synIDattr('name')->assert_equal('')
+ 
+   " remove all the lines in a diff chunk.
+   call win_gotoid(w2_id)
+   7,8d
+   call win_gotoid(w1_id)
+   let hl = range(1, 9)->map({_, lnum -> diff_hlID(lnum, 
1)->synIDattr('name')})
+   call assert_equal(['', 'DiffText', 'DiffText', '', '', '', 'DiffAdd',
+         \ 'DiffAdd', ''], hl)
+ 
+   " remove lines from one diff chunk to just before the next diff chunk
+   call win_gotoid(w2_id)
+   call setline(1, ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i'])
+   2,6d
+   call win_gotoid(w1_id)
+   let hl = range(1, 9)->map({_, lnum -> diff_hlID(lnum, 
1)->synIDattr('name')})
+   call assert_equal(['', 'DiffText', 'DiffText', 'DiffAdd', 'DiffAdd',
+         \ 'DiffAdd', 'DiffAdd', 'DiffAdd', ''], hl)
+ 
+   " remove lines just before the top of a diff chunk
+   call win_gotoid(w2_id)
+   call setline(1, ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i'])
+   5,6d
+   call win_gotoid(w1_id)
+   let hl = range(1, 9)->map({_, lnum -> diff_hlID(lnum, 
1)->synIDattr('name')})
+   call assert_equal(['', 'DiffText', 'DiffText', '', 'DiffText', 'DiffText',
+         \ 'DiffAdd', 'DiffAdd', ''], hl)
+ 
+   " remove line after the end of a diff chunk
+   call win_gotoid(w2_id)
+   call setline(1, ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i'])
+   4d
+   call win_gotoid(w1_id)
+   let hl = range(1, 9)->map({_, lnum -> diff_hlID(lnum, 
1)->synIDattr('name')})
+   call assert_equal(['', 'DiffText', 'DiffText', 'DiffAdd', '', '', 
'DiffText',
+         \ 'DiffText', ''], hl)
+ 
+   " remove lines starting from the end of one diff chunk and ending inside
+   " another diff chunk
+   call win_gotoid(w2_id)
+   call setline(1, ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i'])
+   4,7d
+   call win_gotoid(w1_id)
+   let hl = range(1, 9)->map({_, lnum -> diff_hlID(lnum, 
1)->synIDattr('name')})
+   call assert_equal(['', 'DiffText', 'DiffText', 'DiffText', 'DiffAdd',
+         \ 'DiffAdd', 'DiffAdd', 'DiffAdd', ''], hl)
+ 
+   " removing the only remaining diff chunk should make the files equal
+   call win_gotoid(w2_id)
+   call setline(1, ['a', '2', '3', 'x', 'd', 'e', 'f', 'x', '7', '8', 'i'])
+   8d
+   let hl = range(1, 10)->map({_, lnum -> diff_hlID(lnum, 
1)->synIDattr('name')})
+   call assert_equal(['', '', '', 'DiffAdd', '', '', '', '', '', ''], hl)
+   call win_gotoid(w2_id)
+   4d
+   call win_gotoid(w1_id)
+   let hl = range(1, 9)->map({_, lnum -> diff_hlID(lnum, 
1)->synIDattr('name')})
+   call assert_equal(['', '', '', '', '', '', '', '', ''], hl)
+ 
+   %bw!
+ endfunc
  
  " vim: shiftwidth=2 sts=2 expandtab
*** ../vim-8.2.2972/src/testdir/test_prompt_buffer.vim  2020-11-19 
18:46:19.549796579 +0100
--- src/testdir/test_prompt_buffer.vim  2021-06-10 21:48:27.074136064 +0200
***************
*** 150,155 ****
--- 150,157 ----
    call assert_beeps('normal! S')
    call assert_beeps("normal! \<C-A>")
    call assert_beeps("normal! \<C-X>")
+   call assert_beeps("normal! dp")
+   call assert_beeps("normal! do")
    " pressing CTRL-W in the prompt buffer should trigger the window commands
    call assert_equal(1, winnr())
    exe "normal A\<C-W>\<C-W>"
*** ../vim-8.2.2972/src/testdir/test_recover.vim        2021-06-07 
20:41:18.843857616 +0200
--- src/testdir/test_recover.vim        2021-06-10 21:48:27.074136064 +0200
***************
*** 390,393 ****
--- 390,437 ----
    call delete('.Xfile1.swp')
  endfunc
  
+ " Test for recovering a file when an autocmd moves the cursor to an invalid
+ " line. This used to result in an internal error (E315) which is fixed
+ " by 8.2.2966.
+ func Test_recover_invalid_cursor_pos()
+   call writefile([], 'Xfile1')
+   edit Xfile1
+   preserve
+   let b = readblob('.Xfile1.swp')
+   bw!
+   augroup Test
+     au!
+     au BufReadPost Xfile1 normal! 3G
+   augroup END
+   call writefile(range(1, 3), 'Xfile1')
+   call writefile(b, '.Xfile1.swp')
+   try
+     recover Xfile1
+   catch /E308:/
+     " this test is for the :E315 internal error.
+     " ignore the 'E308: Original file may have been changed' error
+   endtry
+   redraw!
+   augroup Test
+     au!
+   augroup END
+   augroup! Test
+   call delete('Xfile1')
+   call delete('.Xfile1.swp')
+ endfunc
+ 
+ " Test for recovering a buffer without a name
+ func Test_noname_buffer()
+   new
+   call setline(1, ['one', 'two'])
+   preserve
+   let sn = swapname('')
+   let b = readblob(sn)
+   bw!
+   call writefile(b, sn)
+   exe "recover " .. sn
+   call assert_equal(['one', 'two'], getline(1, '$'))
+   call delete(sn)
+ endfunc
+ 
  " vim: shiftwidth=2 sts=2 expandtab
*** ../vim-8.2.2972/src/version.c       2021-06-10 21:07:45.415050893 +0200
--- src/version.c       2021-06-10 21:49:57.285969696 +0200
***************
*** 752,753 ****
--- 752,755 ----
  {   /* Add new patch number below this line */
+ /**/
+     2973,
  /**/

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