1 files changed, 87 insertions, 1 deletions
diff --git a/src/nvim/testdir/test_diffmode.vim b/src/nvim/testdir/test_diffmode.vim
index 21c1f98283..8592f48af7 100644
--- a/src/nvim/testdir/test_diffmode.vim
+++ b/src/nvim/testdir/test_diffmode.vim
@@ -781,17 +781,68 @@ func Test_diff_lastline()
   bwipe!
 endfunc
 
+func WriteDiffFiles(buf, list1, list2)
+  call writefile(a:list1, 'Xfile1')
+  call writefile(a:list2, 'Xfile2')
+  if a:buf
+    call term_sendkeys(a:buf, ":checktime\<CR>")
+  endif
+endfunc
+" Verify a screendump with both the internal and external diff.
+func VerifyBoth(buf, dumpfile, extra)
+  " trailing : for leaving the cursor on the command line
+  for cmd in [":set diffopt=filler" . a:extra . "\<CR>:", ":set diffopt+=internal\<CR>:"]
+    call term_sendkeys(a:buf, cmd)
+    if VerifyScreenDump(a:buf, a:dumpfile, {}, cmd =~ 'internal' ? 'internal' : 'external')
+      break " don't let the next iteration overwrite the "failed" file.
+      " don't let the next iteration overwrite the "failed" file.
+      return
+    endif
+  endfor
+
+  " also test unified diff
+  call term_sendkeys(a:buf, ":call SetupUnified()\<CR>:")
+  call term_sendkeys(a:buf, ":redraw!\<CR>:")
+  call VerifyScreenDump(a:buf, a:dumpfile, {}, 'unified')
+  call term_sendkeys(a:buf, ":call StopUnified()\<CR>:")
+endfunc
+
+" Verify a screendump with the internal diff only.
+func VerifyInternal(buf, dumpfile, extra)
+  call term_sendkeys(a:buf, ":diffupdate!\<CR>")
+  " trailing : for leaving the cursor on the command line
+  call term_sendkeys(a:buf, ":set diffopt=internal,filler" . a:extra . "\<CR>:")
+  call TermWait(a:buf)
+  call VerifyScreenDump(a:buf, a:dumpfile, {})
+endfunc
+
 func Test_diff_screen()
   CheckScreendump
   CheckFeature menu
 
+  let lines =<< trim END
+      func UnifiedDiffExpr()
+        " Prepend some text to check diff type detection
+        call writefile(['warning', '  message'], v:fname_out)
+        silent exe '!diff -U0 ' .. v:fname_in .. ' ' .. v:fname_new .. '>>' .. v:fname_out
+      endfunc
+      func SetupUnified()
+        set diffexpr=UnifiedDiffExpr()
+        diffupdate
+      endfunc
+      func StopUnified()
+        set diffexpr=
+      endfunc
+  END
+  call writefile(lines, 'XdiffSetup')
+
   " clean up already existing swap files, just in case
   call delete('.Xfile1.swp')
   call delete('.Xfile2.swp')
 
   " Test 1: Add a line in beginning of file 2
   call WriteDiffFiles(0, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
-  let buf = RunVimInTerminal('-d Xfile1 Xfile2', {})
+  let buf = RunVimInTerminal('-d -S XdiffSetup Xfile1 Xfile2', {})
   " Set autoread mode, so that Vim won't complain once we re-write the test
   " files
   call term_sendkeys(buf, ":set autoread\<CR>\<c-w>w:set autoread\<CR>\<c-w>w")
@@ -911,6 +962,7 @@ func Test_diff_screen()
   call StopVimInTerminal(buf)
   call delete('Xfile1')
   call delete('Xfile2')
+  call delete('XdiffSetup')
 endfunc
 
 func Test_diff_with_cursorline()
@@ -1096,4 +1148,38 @@ func Test_diff_and_scroll()
   set ls&
 endfunc
 
+func Test_diff_filler_cursorcolumn()
+  CheckScreendump
+
+  let content =<< trim END
+    call setline(1, ['aa', 'bb', 'cc'])
+    vnew
+    call setline(1, ['aa', 'cc'])
+    windo diffthis
+    wincmd p
+    setlocal cursorcolumn foldcolumn=0
+    norm! gg0
+    redraw!
+  END
+  call writefile(content, 'Xtest_diff_cuc')
+  let buf = RunVimInTerminal('-S Xtest_diff_cuc', {})
+
+  call VerifyScreenDump(buf, 'Test_diff_cuc_01', {})
+
+  call term_sendkeys(buf, "l")
+  call term_sendkeys(buf, "\<C-l>")
+  call VerifyScreenDump(buf, 'Test_diff_cuc_02', {})
+  call term_sendkeys(buf, "0j")
+  call term_sendkeys(buf, "\<C-l>")
+  call VerifyScreenDump(buf, 'Test_diff_cuc_03', {})
+  call term_sendkeys(buf, "l")
+  call term_sendkeys(buf, "\<C-l>")
+  call VerifyScreenDump(buf, 'Test_diff_cuc_04', {})
+
+  " clean up
+  call StopVimInTerminal(buf)
+  call delete('Xtest_diff_cuc')
+endfunc
+
+
 " vim: shiftwidth=2 sts=2 expandtab