diff --git a/src/nvim/eval.c b/src/nvim/eval.c
index b395d7bb8a..00542e3766 100644
--- a/src/nvim/eval.c
+++ b/src/nvim/eval.c
@@ -4518,7 +4518,6 @@ int get_option_tv(const char **const arg, typval_T *const rettv,
 static int get_string_tv(char_u **arg, typval_T *rettv, int evaluate)
 {
   char_u      *p;
-  char_u      *name;
   unsigned int extra = 0;
 
   /*
@@ -4526,11 +4525,14 @@ static int get_string_tv(char_u **arg, typval_T *rettv, int evaluate)
    */
   for (p = *arg + 1; *p != NUL && *p != '"'; MB_PTR_ADV(p)) {
     if (*p == '\\' && p[1] != NUL) {
-      ++p;
-      /* A "\<x>" form occupies at least 4 characters, and produces up
-       * to 6 characters: reserve space for 2 extra */
-      if (*p == '<')
-        extra += 2;
+      p++;
+      // A "\<x>" form occupies at least 4 characters, and produces up
+      // to 21 characters (3 * 6 for the char and 3 for a modifier):
+      // reserve space for 18 extra.
+      // Each byte in the char could be encoded as K_SPECIAL K_EXTRA x.
+      if (*p == '<') {
+        extra += 18;
+      }
     }
   }
 
@@ -4549,7 +4551,8 @@ static int get_string_tv(char_u **arg, typval_T *rettv, int evaluate)
    * Copy the string into allocated memory, handling backslashed
    * characters.
    */
-  name = xmalloc(p - *arg + extra);
+  const int len = (int)(p - *arg + extra);
+  char_u *name = xmalloc(len);
   rettv->v_type = VAR_STRING;
   rettv->vval.v_string = name;
 
@@ -4616,6 +4619,9 @@ static int get_string_tv(char_u **arg, typval_T *rettv, int evaluate)
         extra = trans_special((const char_u **)&p, STRLEN(p), name, true, true);
         if (extra != 0) {
           name += extra;
+          if (name >= rettv->vval.v_string + len) {
+            iemsg("get_string_tv() used more space than allocated");
+          }
           break;
         }
         FALLTHROUGH;
diff --git a/src/nvim/testdir/check.vim b/src/nvim/testdir/check.vim
index 073873bcb0..e0ebe8fd49 100644
--- a/src/nvim/testdir/check.vim
+++ b/src/nvim/testdir/check.vim
@@ -65,3 +65,11 @@ func CheckCanRunGui()
     throw 'Skipped: cannot start the GUI'
   endif
 endfunc
+
+" Command to check that not currently using the GUI
+command CheckNotGui call CheckNotGui()
+func CheckNotGui()
+  if has('gui_running')
+    throw 'Skipped: only works in the terminal'
+  endif
+endfunc
diff --git a/src/nvim/testdir/test_edit.vim b/src/nvim/testdir/test_edit.vim
index 12d5d9790e..dbe12fc8fc 100644
--- a/src/nvim/testdir/test_edit.vim
+++ b/src/nvim/testdir/test_edit.vim
@@ -1,9 +1,11 @@
 " Test for edit functions
-"
+
 if exists("+t_kD")
   let &t_kD="[3;*~"
 endif
 
+source check.vim
+
 " Needed for testing basic rightleft: Test_edit_rightleft
 source view_util.vim
 
@@ -1514,3 +1516,23 @@ func Test_edit_startinsert()
   set backspace&
   bwipe!
 endfunc
+
+func Test_edit_noesckeys()
+  CheckNotGui
+  new
+
+  " <Left> moves cursor when 'esckeys' is set
+  exe "set t_kl=\<Esc>OD"
+  " set esckeys
+  call feedkeys("axyz\<Esc>ODX", "xt")
+  " call assert_equal("xyXz", getline(1))
+
+  " <Left> exits Insert mode when 'esckeys' is off
+  " set noesckeys
+  call setline(1, '')
+  call feedkeys("axyz\<Esc>ODX", "xt")
+  call assert_equal(["DX", "xyz"], getline(1, 2))
+
+  bwipe!
+  " set esckeys
+endfunc
diff --git a/src/nvim/testdir/test_functions.vim b/src/nvim/testdir/test_functions.vim
index 6b45ac61d1..c29e0410a9 100644
--- a/src/nvim/testdir/test_functions.vim
+++ b/src/nvim/testdir/test_functions.vim
@@ -1221,6 +1221,24 @@ func Test_reg_executing_and_recording()
   unlet s:reg_stat
 endfunc
 
+func Test_getchar()
+  throw 'skipped: Nvim does not support test_setmouse()'
+  call feedkeys('a', '')
+  call assert_equal(char2nr('a'), getchar())
+
+  call test_setmouse(1, 3)
+  let v:mouse_win = 9
+  let v:mouse_winid = 9
+  let v:mouse_lnum = 9
+  let v:mouse_col = 9
+  call feedkeys("\<S-LeftMouse>", '')
+  call assert_equal("\<S-LeftMouse>", getchar())
+  call assert_equal(1, v:mouse_win)
+  call assert_equal(win_getid(1), v:mouse_winid)
+  call assert_equal(1, v:mouse_lnum)
+  call assert_equal(3, v:mouse_col)
+endfunc
+
 func Test_libcall_libcallnr()
   if !has('libcall')
     return
@@ -1341,3 +1359,22 @@ func Test_readdir()
 
   call delete('Xdir', 'rf')
 endfunc
+
+" Test for the eval() function
+func Test_eval()
+  call assert_fails("call eval('5 a')", 'E488:')
+endfunc
+
+" Test for the nr2char() function
+func Test_nr2char()
+  " set encoding=latin1
+  call assert_equal('@', nr2char(64))
+  set encoding=utf8
+  call assert_equal('a', nr2char(97, 1))
+  call assert_equal('a', nr2char(97, 0))
+
+  call assert_equal("\x80\xfc\b\xf4\x80\xfeX\x80\xfeX\x80\xfeX", eval('"\<M-' .. nr2char(0x100000) .. '>"'))
+  call assert_equal("\x80\xfc\b\xfd\x80\xfeX\x80\xfeX\x80\xfeX\x80\xfeX\x80\xfeX", eval('"\<M-' .. nr2char(0x40000000) .. '>"'))
+endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab