vim-patch:partial:8.1.1155: termcodes tests can be improved

Problem:    Termcodes tests can be improved.
Solution:   Add helper functions to simplify tests.  Dragging statusline for
            xterm and sgr. (Dominique Pelle, closes vim/vim#4237)

https://github.com/vim/vim/commit/3fbd2d7c316eaeea463b2f84f29b36d439306bf9

Co-authored-by: Bram Moolenaar <Bram@vim.org>

3 files changed, 166 insertions, 6 deletions

diff --git a/test/old/testdir/mouse.vim b/test/old/testdir/mouse.vim
index 119f4725cf..a3b0ddd008 100644
--- a/test/old/testdir/mouse.vim
+++ b/test/old/testdir/mouse.vim
@@ -1,5 +1,9 @@
 " Helper functions for generating mouse events
 
+let g:Ttymouse_values = ['sgr']
+let g:Ttymouse_dec = []
+let g:Ttymouse_netterm = []
+
 func MouseLeftClick(row, col)
   call nvim_input_mouse('left', 'press', '', 0, a:row - 1, a:col - 1)
   call getchar(1)
diff --git a/test/old/testdir/test_selectmode.vim b/test/old/testdir/test_selectmode.vim
index c72e345efd..d1afd5204f 100644
--- a/test/old/testdir/test_selectmode.vim
+++ b/test/old/testdir/test_selectmode.vim
@@ -163,7 +163,7 @@ endfunc
 " Test double/triple/quadruple click to start 'select' mode
 func Test_term_mouse_multiple_clicks_to_select_mode()
   let save_mouse = &mouse
-  " let save_term = &term
+  let save_term = &term
   " let save_ttymouse = &ttymouse
   " call test_override('no_query_mouse', 1)
   " set mouse=a term=xterm mousetime=200
@@ -171,10 +171,9 @@ func Test_term_mouse_multiple_clicks_to_select_mode()
   set selectmode=mouse
   new
 
-  " for ttymouse_val in g:Ttymouse_values + g:Ttymouse_dec
-  "   let msg = 'ttymouse=' .. ttymouse_val
-  "   exe 'set ttymouse=' .. ttymouse_val
-  let msg = ''
+  for ttymouse_val in g:Ttymouse_values + g:Ttymouse_dec
+    let msg = 'ttymouse=' .. ttymouse_val
+    " exe 'set ttymouse=' .. ttymouse_val
 
     " Single-click and drag should 'select' the characters
     call setline(1, ['foo [foo bar] foo', 'foo'])
@@ -247,7 +246,7 @@ func Test_term_mouse_multiple_clicks_to_select_mode()
     call assert_equal("\<c-s>", mode(), msg)
     norm! x
     call assert_equal(['axaa', 'bxbb'], getline(1, '$'), msg)
-  " endfor
+  endfor
 
   let &mouse = save_mouse
   " let &term = save_term
diff --git a/test/old/testdir/test_termcodes.vim b/test/old/testdir/test_termcodes.vim
index 99bc2d1d37..8587659334 100644
--- a/test/old/testdir/test_termcodes.vim
+++ b/test/old/testdir/test_termcodes.vim
@@ -1,4 +1,161 @@
 
+source check.vim
+" CheckNotGui
+" CheckUnix
+
+source shared.vim
+source mouse.vim
+source view_util.vim
+source term_util.vim
+
+func Test_xterm_mouse_click()
+  new
+  let save_mouse = &mouse
+  let save_term = &term
+  " let save_ttymouse = &ttymouse
+  " set mouse=a term=xterm
+  set mouse=a
+  call setline(1, ['line 1', 'line 2', 'line 3 is a bit longer'])
+  for ttymouse_val in ['sgr']
+    " exe 'set ttymouse=' . ttymouse_val
+    go
+    call assert_equal([0, 1, 1, 0], getpos('.'))
+    let row = 2
+    let col = 6
+    call MouseLeftClick(row, col)
+    call MouseLeftRelease(row, col)
+    call assert_equal([0, 2, 6, 0], getpos('.'))
+  endfor
+
+  let &mouse = save_mouse
+  " let &term = save_term
+  " let &ttymouse = save_ttymouse
+  bwipe!
+endfunc
+
+func Test_xterm_mouse_wheel()
+  new
+  let save_mouse = &mouse
+  let save_term = &term
+  " let save_ttymouse = &ttymouse
+  " set mouse=a term=xterm
+  set mouse=a
+  call setline(1, range(1, 100))
+
+  for ttymouse_val in ['sgr']
+    " exe 'set ttymouse=' . ttymouse_val
+    go
+    call assert_equal(1, line('w0'))
+    call assert_equal([0, 1, 1, 0], getpos('.'))
+
+    call MouseWheelDown(1, 1)
+    call assert_equal(4, line('w0'))
+    call assert_equal([0, 4, 1, 0], getpos('.'))
+
+    call MouseWheelDown(1, 1)
+    call assert_equal(7, line('w0'))
+    call assert_equal([0, 7, 1, 0], getpos('.'))
+
+    call MouseWheelUp(1, 1)
+    call assert_equal(4, line('w0'))
+    call assert_equal([0, 7, 1, 0], getpos('.'))
+
+    call MouseWheelUp(1, 1)
+    call assert_equal(1, line('w0'))
+    call assert_equal([0, 7, 1, 0], getpos('.'))
+  endfor
+
+  let &mouse = save_mouse
+  " let &term = save_term
+  " let &ttymouse = save_ttymouse
+  bwipe!
+endfunc
+
+func Test_xterm_mouse_drag_window_separator()
+  let save_mouse = &mouse
+  let save_term = &term
+  " let save_ttymouse = &ttymouse
+  " set mouse=a term=xterm
+  set mouse=a
+
+  for ttymouse_val in ['sgr']
+    " exe 'set ttymouse=' . ttymouse_val
+
+    " Split horizontally and test dragging the horizontal window separator.
+    split
+    let rowseparator = winheight(0) + 1
+    let row = rowseparator
+    let col = 1
+    call MouseLeftClick(row, col)
+
+    let row -= 1
+    call MouseLeftDrag(row, col)
+    call assert_equal(rowseparator - 1, winheight(0) + 1)
+    let row += 1
+    call MouseLeftDrag(row, col)
+    call assert_equal(rowseparator, winheight(0) + 1)
+    call MouseLeftRelease(row, col)
+    call assert_equal(rowseparator, winheight(0) + 1)
+
+    bwipe!
+
+    " Split vertically and test dragging the vertical window separator.
+    vsplit
+    let colseparator = winwidth(0) + 1
+
+    let row = 1
+    let col = colseparator
+    call MouseLeftClick(row, col)
+    let col -= 1
+    call MouseLeftDrag(row, col)
+    call assert_equal(colseparator - 1, winwidth(0) + 1)
+    let col += 1
+    call MouseLeftDrag(row, col)
+    call assert_equal(colseparator, winwidth(0) + 1)
+    call MouseLeftRelease(row, col)
+    call assert_equal(colseparator, winwidth(0) + 1)
+
+    bwipe!
+  endfor
+
+  let &mouse = save_mouse
+  " let &term = save_term
+  " let &ttymouse = save_ttymouse
+endfunc
+
+func Test_xterm_mouse_drag_statusline()
+  let save_mouse = &mouse
+  let save_term = &term
+  " let save_ttymouse = &ttymouse
+  " set mouse=a term=xterm
+  set mouse=a
+
+  for ttymouse_val in ['sgr']
+    " exe 'set ttymouse=' . ttymouse_val
+
+    call assert_equal(1, &cmdheight)
+    let rowstatusline = winheight(0) + 1
+    let row = rowstatusline
+    let col = 1
+    call MouseLeftClick(row, col)
+    let row -= 1
+    call MouseLeftDrag(row, col)
+    call assert_equal(2, &cmdheight)
+    call assert_equal(rowstatusline - 1, winheight(0) + 1)
+    let row += 1
+    call MouseLeftDrag(row, col)
+    call assert_equal(1, &cmdheight)
+    call assert_equal(rowstatusline, winheight(0) + 1)
+    call MouseLeftRelease(row, col)
+    call assert_equal(1, &cmdheight)
+    call assert_equal(rowstatusline, winheight(0) + 1)
+  endfor
+
+  let &mouse = save_mouse
+  " let &term = save_term
+  " let &ttymouse = save_ttymouse
+endfunc
+
 " Test for translation of special key codes (<xF1>, <xF2>, etc.)
 func Test_Keycode_Translation()
   let keycodes = [