diff --git a/src/testdir/test_assert.vim b/src/testdir/test_assert.vim
index 04bd877..e0dc99e 100644
--- a/src/testdir/test_assert.vim
+++ b/src/testdir/test_assert.vim
@@ -374,6 +374,8 @@
   call test_setmouse(5, 1)
   call feedkeys("\<LeftMouse>", "xt")
   call assert_equal([0, 2, 1, 0], getpos('.'))
+  call assert_fails('call test_setmouse("", 2)', 'E474:')
+  call assert_fails('call test_setmouse(1, "")', 'E474:')
   bwipe!
   let &mouse = save_mouse
 endfunc
diff --git a/src/testdir/test_gui.vim b/src/testdir/test_gui.vim
index 3472012..e935e5f 100644
--- a/src/testdir/test_gui.vim
+++ b/src/testdir/test_gui.vim
@@ -882,7 +882,7 @@
   new
   call setline(1, ['one two three', 'four five six'])
 
-  " place the cursor using left click
+  " place the cursor using left click in normal mode
   call cursor(1, 1)
   call test_gui_mouse_event(0, 2, 4, 0, 0)
   call test_gui_mouse_event(3, 2, 4, 0, 0)
@@ -1092,9 +1092,70 @@
   set mouse&
   let &guioptions = save_guioptions
 
+  " Test invalid parameters for test_gui_mouse_event()
+  call assert_fails('call test_gui_mouse_event("", 1, 2, 3, 4)', 'E474:')
+  call assert_fails('call test_gui_mouse_event(0, "", 2, 3, 4)', 'E474:')
+  call assert_fails('call test_gui_mouse_event(0, 1, "", 3, 4)', 'E474:')
+  call assert_fails('call test_gui_mouse_event(0, 1, 2, "", 4)', 'E474:')
+  call assert_fails('call test_gui_mouse_event(0, 1, 2, 3, "")', 'E474:')
+
   bw!
   call test_override('no_query_mouse', 0)
   set mousemodel&
 endfunc
 
+" Test for 'guitablabel' and 'guitabtooltip' options
+func TestGuiTabLabel()
+  call add(g:TabLabels, v:lnum + 100)
+  let bufnrlist = tabpagebuflist(v:lnum)
+  return bufname(bufnrlist[tabpagewinnr(v:lnum) - 1])
+endfunc
+
+func TestGuiTabToolTip()
+  call add(g:TabToolTips, v:lnum + 200)
+  let bufnrlist = tabpagebuflist(v:lnum)
+  return bufname(bufnrlist[tabpagewinnr(v:lnum) - 1])
+endfunc
+
+func Test_gui_tablabel_tooltip()
+  %bw!
+  " Removing the tabline at the end of this test, reduces the window height by
+  " one. Save and restore it after the test.
+  let save_lines = &lines
+  edit one
+  set modified
+  tabnew two
+  set modified
+  tabnew three
+  set modified
+  let g:TabLabels = []
+  set guitablabel=%{TestGuiTabLabel()}
+  call test_override('starting', 1)
+  redrawtabline
+  call test_override('starting', 0)
+  call assert_true(index(g:TabLabels, 101) != -1)
+  call assert_true(index(g:TabLabels, 102) != -1)
+  call assert_true(index(g:TabLabels, 103) != -1)
+  set guitablabel&
+  unlet g:TabLabels
+
+  if has('gui_gtk')
+    " Only on GTK+, the tooltip function is called even if the mouse is not
+    " on the tabline. on Win32 and Motif, the tooltip function is called only
+    " when the mouse pointer is over the tabline.
+    let g:TabToolTips = []
+    set guitabtooltip=%{TestGuiTabToolTip()}
+    call test_override('starting', 1)
+    redrawtabline
+    call test_override('starting', 0)
+    call assert_true(index(g:TabToolTips, 201) != -1)
+    call assert_true(index(g:TabToolTips, 202) != -1)
+    call assert_true(index(g:TabToolTips, 203) != -1)
+    set guitabtooltip&
+    unlet g:TabToolTips
+  endif
+  %bw!
+  let &lines = save_lines
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/testdir/test_popupwin.vim b/src/testdir/test_popupwin.vim
index 147a3a4..68d7db8 100644
--- a/src/testdir/test_popupwin.vim
+++ b/src/testdir/test_popupwin.vim
@@ -1552,8 +1552,8 @@
   call assert_equal(9, getcurpos()[2])
   call feedkeys('0', 'xt')
   call assert_equal('0', g:ignored)
-  redraw
-  call assert_equal(1, getcurpos()[2])
+  normal! l
+  call assert_equal(2, getcurpos()[2])
 
   " x closes the popup
   call feedkeys('x', 'xt')
diff --git a/src/testdir/test_vim9_builtin.vim b/src/testdir/test_vim9_builtin.vim
index d8fd079..c40780f 100644
--- a/src/testdir/test_vim9_builtin.vim
+++ b/src/testdir/test_vim9_builtin.vim
@@ -141,6 +141,11 @@
   CheckScriptSuccess(lines)
 enddef
 
+def Test_and()
+  CheckDefFailure(['echo and("x", 0x2)'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo and(0x1, "x")'], 'E1013: Argument 2: type mismatch, expected number but got string')
+enddef
+
 def Test_append()
   new
   setline(1, range(3))
@@ -155,6 +160,22 @@
   bwipe!
 enddef
 
+def Test_argc()
+  CheckDefFailure(['echo argc("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
+def Test_arglistid()
+  CheckDefFailure(['echo arglistid("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo arglistid(1, "y")'], 'E1013: Argument 2: type mismatch, expected number but got string')
+  CheckDefFailure(['echo arglistid("x", "y")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
+def Test_argv()
+  CheckDefFailure(['echo argv("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo argv(1, "x")'], 'E1013: Argument 2: type mismatch, expected number but got string')
+  CheckDefFailure(['echo argv("x", "y")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
 def Test_balloon_show()
   CheckGui
   CheckFeature balloon_eval
@@ -256,6 +277,10 @@
   assert_fails('chdir(true)', 'E1174')
 enddef
 
+def Test_clearmatches()
+  CheckDefFailure(['echo clearmatches("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
 def Test_col()
   new
   setline(1, 'asdf')
@@ -311,6 +336,11 @@
   CheckDefExecAndScriptFailure(lines, 'E475:')
 enddef
 
+def Test_debugbreak()
+  CheckMSWindows
+  CheckDefFailure(['echo debugbreak("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
 def Test_delete()
   var res: bool = delete('doesnotexist')
   assert_equal(true, res)
@@ -532,6 +562,64 @@
   CheckDefAndScriptFailure(lines, 'E1158:')
 enddef
 
+" Test for float functions argument type
+def Test_float_funcs_args()
+  CheckFeature float
+
+  # acos()
+  CheckDefFailure(['echo acos("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  # asin()
+  CheckDefFailure(['echo asin("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  # atan()
+  CheckDefFailure(['echo atan("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  # atan2()
+  CheckDefFailure(['echo atan2("a", 1.1)'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo atan2(1.2, "a")'], 'E1013: Argument 2: type mismatch, expected number but got string')
+  CheckDefFailure(['echo atan2(1.2)'], 'E119:')
+  # ceil()
+  CheckDefFailure(['echo ceil("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  # cos()
+  CheckDefFailure(['echo cos("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  # cosh()
+  CheckDefFailure(['echo cosh("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  # exp()
+  CheckDefFailure(['echo exp("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  # float2nr()
+  CheckDefFailure(['echo float2nr("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  # floor()
+  CheckDefFailure(['echo floor("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  # fmod()
+  CheckDefFailure(['echo fmod(1.1, "a")'], 'E1013: Argument 2: type mismatch, expected number but got string')
+  CheckDefFailure(['echo fmod("a", 1.1)'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo fmod(1.1)'], 'E119:')
+  # isinf()
+  CheckDefFailure(['echo isinf("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  # isnan()
+  CheckDefFailure(['echo isnan("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  # log()
+  CheckDefFailure(['echo log("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  # log10()
+  CheckDefFailure(['echo log10("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  # pow()
+  CheckDefFailure(['echo pow("a", 1.1)'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo pow(1.1, "a")'], 'E1013: Argument 2: type mismatch, expected number but got string')
+  CheckDefFailure(['echo pow(1.1)'], 'E119:')
+  # round()
+  CheckDefFailure(['echo round("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  # sin()
+  CheckDefFailure(['echo sin("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  # sinh()
+  CheckDefFailure(['echo sinh("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  # sqrt()
+  CheckDefFailure(['echo sqrt("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  # tan()
+  CheckDefFailure(['echo tan("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  # tanh()
+  CheckDefFailure(['echo tanh("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  # trunc()
+  CheckDefFailure(['echo trunc("a")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
 def Test_fnamemodify()
   CheckDefSuccess(['echo fnamemodify(test_null_string(), ":p")'])
   CheckDefSuccess(['echo fnamemodify("", ":p")'])
@@ -652,6 +740,20 @@
   set wildignore&
 enddef
 
+def Test_getcurpos()
+  CheckDefFailure(['echo getcursorcharpos("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
+def Test_getcursorcharpos()
+  CheckDefFailure(['echo getcursorcharpos("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
+def Test_getcwd()
+  CheckDefFailure(['echo getcwd("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo getcwd("x", 1)'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo getcwd(1, "x")'], 'E1013: Argument 2: type mismatch, expected number but got string')
+enddef
+
 def Test_getloclist_return_type()
   var l = getloclist(1)
   l->assert_equal([])
@@ -692,6 +794,16 @@
   CheckDefExecFailure(['echo getftype(v:null)'], 'E1174:')
 enddef
 
+def Test_getjumplist()
+  CheckDefFailure(['echo getjumplist("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo getjumplist("x", 1)'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo getjumplist(1, "x")'], 'E1013: Argument 2: type mismatch, expected number but got string')
+enddef
+
+def Test_getmatches()
+  CheckDefFailure(['echo getmatches("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
 def Test_getqflist_return_type()
   var l = getqflist()
   l->assert_equal([])
@@ -727,6 +839,22 @@
   assert_fails('getregtype("ab")', 'E1162:')
 enddef
 
+def Test_gettabinfo()
+  CheckDefFailure(['echo gettabinfo("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
+def Test_gettagstack()
+  CheckDefFailure(['echo gettagstack("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
+def Test_getwininfo()
+  CheckDefFailure(['echo getwininfo("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
+def Test_getwinpos()
+  CheckDefFailure(['echo getwinpos("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
 def Test_glob()
   glob('runtest.vim', true, true, true)->assert_equal(['runtest.vim'])
 enddef
@@ -739,6 +867,12 @@
   has('eval', true)->assert_equal(1)
 enddef
 
+def Test_haslocaldir()
+  CheckDefFailure(['echo haslocaldir("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo haslocaldir("x", 1)'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo haslocaldir(1, "x")'], 'E1013: Argument 2: type mismatch, expected number but got string')
+enddef
+
 def Test_hasmapto()
   hasmapto('foobar', 'i', true)->assert_equal(0)
   iabbrev foo foobar
@@ -790,6 +924,10 @@
   CheckDefFailure(['insert([2, 3], 1, "x")'], 'E1013: Argument 3: type mismatch, expected number but got string', 1)
 enddef
 
+def Test_invert()
+  CheckDefFailure(['echo invert("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
 def Test_keys_return_type()
   const var: list<string> = {a: 1, b: 2}->keys()
   var->assert_equal(['a', 'b'])
@@ -812,6 +950,10 @@
           ->str2nr()
 enddef
 
+def Test_listener_remove()
+  CheckDefFailure(['echo listener_remove("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
 def Test_map_function_arg()
   var lines =<< trim END
       def MapOne(i: number, v: string): string
@@ -914,6 +1056,16 @@
   delete('Xtmpfile')
 enddef
 
+def Test_matcharg()
+  CheckDefFailure(['echo matcharg("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
+def Test_matchdelete()
+  CheckDefFailure(['echo matchdelete("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo matchdelete("x", 1)'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo matchdelete(1, "x")'], 'E1013: Argument 2: type mismatch, expected number but got string')
+enddef
+
 def Test_max()
   g:flag = true
   var l1: list<number> = g:flag
@@ -946,6 +1098,11 @@
   nr2char(97, true)->assert_equal('a')
 enddef
 
+def Test_or()
+  CheckDefFailure(['echo or("x", 0x2)'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo or(0x1, "x")'], 'E1013: Argument 2: type mismatch, expected number but got string')
+enddef
+
 def Test_readdir()
    eval expand('sautest')->readdir((e) => e[0] !=# '.')
    eval expand('sautest')->readdirex((e) => e.name[0] !=# '.')
@@ -995,6 +1152,26 @@
   res->assert_equal(6)
 enddef
 
+def Test_screenattr()
+  CheckDefFailure(['echo screenattr("x", 1)'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo screenattr(1, "x")'], 'E1013: Argument 2: type mismatch, expected number but got string')
+enddef
+
+def Test_screenchar()
+  CheckDefFailure(['echo screenchar("x", 1)'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo screenchar(1, "x")'], 'E1013: Argument 2: type mismatch, expected number but got string')
+enddef
+
+def Test_screenchars()
+  CheckDefFailure(['echo screenchars("x", 1)'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo screenchars(1, "x")'], 'E1013: Argument 2: type mismatch, expected number but got string')
+enddef
+
+def Test_screenstring()
+  CheckDefFailure(['echo screenstring("x", 1)'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo screenstring(1, "x")'], 'E1013: Argument 2: type mismatch, expected number but got string')
+enddef
+
 def Test_search()
   new
   setline(1, ['foo', 'bar'])
@@ -1157,6 +1334,10 @@
   getbufvar('%', 'myvar')->assert_equal(123)
 enddef
 
+def Test_setcmdpos()
+  CheckDefFailure(['echo setcmdpos("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
 def Test_setloclist()
   var items = [{filename: '/tmp/file', lnum: 1, valid: true}]
   var what = {items: items}
@@ -1172,6 +1353,10 @@
   assert_fails('setreg("ab", 0)', 'E1162:')
 enddef 
 
+def Test_shiftwidth()
+  CheckDefFailure(['echo shiftwidth("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
 def Test_slice()
   assert_equal('12345', slice('012345', 1))
   assert_equal('123', slice('012345', 1, 4))
@@ -1309,6 +1494,20 @@
   timer_stop(id)
 enddef
 
+def Test_tolower()
+  CheckDefFailure(['echo tolower(1)'], 'E1013: Argument 1: type mismatch, expected string but got number')
+enddef
+
+def Test_toupper()
+  CheckDefFailure(['echo toupper(1)'], 'E1013: Argument 1: type mismatch, expected string but got number')
+enddef
+
+def Test_tr()
+  CheckDefFailure(['echo tr(1, "a", "b")'], 'E1013: Argument 1: type mismatch, expected string but got number')
+  CheckDefFailure(['echo tr("a", 1, "b")'], 'E1013: Argument 2: type mismatch, expected string but got number')
+  CheckDefFailure(['echo tr("a", "a", 1)'], 'E1013: Argument 3: type mismatch, expected string but got number')
+enddef
+
 def Test_win_execute()
   assert_equal("\n" .. winnr(), win_execute(win_getid(), 'echo winnr()'))
   assert_equal('', win_execute(342343, 'echo winnr()'))
@@ -1338,7 +1537,45 @@
   CheckDefAndScriptFailure(lines, 'E1012: Type mismatch; expected list<number> but got dict<number>', 1)
 enddef
 
+def Test_win_gettype()
+  CheckDefFailure(['echo win_gettype("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
 
+def Test_win_gotoid()
+  CheckDefFailure(['echo win_gotoid("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
 
+def Test_win_id2tabwin()
+  CheckDefFailure(['echo win_id2tabwin("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
+def Test_win_id2win()
+  CheckDefFailure(['echo win_id2win("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
+def Test_win_screenpos()
+  CheckDefFailure(['echo win_screenpos("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
+def Test_winbufnr()
+  CheckDefFailure(['echo winbufnr("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
+def Test_winheight()
+  CheckDefFailure(['echo winheight("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
+def Test_winlayout()
+  CheckDefFailure(['echo winlayout("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
+def Test_winwidth()
+  CheckDefFailure(['echo winwidth("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
+def Test_xor()
+  CheckDefFailure(['echo xor("x", 0x2)'], 'E1013: Argument 1: type mismatch, expected number but got string')
+  CheckDefFailure(['echo xor(0x1, "x")'], 'E1013: Argument 2: type mismatch, expected number but got string')
+enddef
 
 " vim: ts=8 sw=2 sts=2 expandtab tw=80 fdm=marker