diff --git a/src/testdir/test_lua.vim b/src/testdir/test_lua.vim
index 7e72728..a99affc 100644
--- a/src/testdir/test_lua.vim
+++ b/src/testdir/test_lua.vim
@@ -28,21 +28,37 @@
 endfunc
 
 " Check that switching to another buffer does not trigger ml_get error.
-func Test_lua_command_new_no_ml_get_error()
+func Test_lua_luado_change_buffer()
   new
+
   let wincount = winnr('$')
   call setline(1, ['one', 'two', 'three'])
   luado vim.command("new")
   call assert_equal(wincount + 1, winnr('$'))
+
   %bwipe!
 endfunc
 
-" Test vim.command()
-func Test_lua_command()
+" Check that :luado deleting lines does not trigger ml_get error.
+func Test_lua_luado_delete_lines()
   new
+
+  call setline(1, ['one', 'two', 'three'])
+  luado vim.command("%d_")
+  call assert_equal([''], getline(1, '$'))
+
   call setline(1, ['one', 'two', 'three'])
   luado vim.command("1,2d_")
   call assert_equal(['three'], getline(1, '$'))
+
+  call setline(1, ['one', 'two', 'three'])
+  luado vim.command("2,3d_"); return "REPLACED"
+  call assert_equal(['REPLACED'], getline(1, '$'))
+
+  call setline(1, ['one', 'two', 'three'])
+  2,3luado vim.command("1,2d_"); return "REPLACED"
+  call assert_equal(['three'], getline(1, '$'))
+
   bwipe!
 endfunc
 
diff --git a/src/testdir/test_perl.vim b/src/testdir/test_perl.vim
index 681aaae..721179c 100644
--- a/src/testdir/test_perl.vim
+++ b/src/testdir/test_perl.vim
@@ -211,10 +211,25 @@
   call assert_false(search('\Cperl'))
   bw!
 
-  " Check deleting lines does not trigger ml_get error.
   new
+
+  " Check deleting lines does not trigger ml_get error.
   call setline(1, ['one', 'two', 'three'])
   perldo VIM::DoCommand("%d_")
+  call assert_equal([''], getline(1, '$'))
+
+  call setline(1, ['one', 'two', 'three'])
+  perldo VIM::DoCommand("1,2d_")
+  call assert_equal(['three'], getline(1, '$'))
+
+  call setline(1, ['one', 'two', 'three'])
+  perldo VIM::DoCommand("2,3d_"); $_ = "REPLACED"
+  call assert_equal(['REPLACED'], getline(1, '$'))
+
+  call setline(1, ['one', 'two', 'three'])
+  2,3perldo VIM::DoCommand("1,2d_"); $_ = "REPLACED"
+  call assert_equal(['three'], getline(1, '$'))
+
   bwipe!
 
   " Check a Perl expression which gives an error.
diff --git a/src/testdir/test_python2.vim b/src/testdir/test_python2.vim
index 066b4bd..ac43e60 100644
--- a/src/testdir/test_python2.vim
+++ b/src/testdir/test_python2.vim
@@ -56,10 +56,25 @@
 endfunc
 
 func Test_pydo()
-  " Check deleting lines does not trigger an ml_get error.
   new
+
+  " Check deleting lines does not trigger an ml_get error.
   call setline(1, ['one', 'two', 'three'])
   pydo vim.command("%d_")
+  call assert_equal([''], getline(1, '$'))
+
+  call setline(1, ['one', 'two', 'three'])
+  pydo vim.command("1,2d_")
+  call assert_equal(['three'], getline(1, '$'))
+
+  call setline(1, ['one', 'two', 'three'])
+  pydo vim.command("2,3d_"); return "REPLACED"
+  call assert_equal(['REPLACED'], getline(1, '$'))
+
+  call setline(1, ['one', 'two', 'three'])
+  2,3pydo vim.command("1,2d_"); return "REPLACED"
+  call assert_equal(['three'], getline(1, '$'))
+
   bwipe!
 
   " Check switching to another buffer does not trigger an ml_get error.
diff --git a/src/testdir/test_python3.vim b/src/testdir/test_python3.vim
index e975cb6..7f04f11 100644
--- a/src/testdir/test_python3.vim
+++ b/src/testdir/test_python3.vim
@@ -88,10 +88,25 @@
 endfunc
 
 func Test_py3do()
-  " Check deleting lines does not trigger an ml_get error.
   new
+
+  " Check deleting lines does not trigger an ml_get error.
   call setline(1, ['one', 'two', 'three'])
   py3do vim.command("%d_")
+  call assert_equal([''], getline(1, '$'))
+
+  call setline(1, ['one', 'two', 'three'])
+  py3do vim.command("1,2d_")
+  call assert_equal(['three'], getline(1, '$'))
+
+  call setline(1, ['one', 'two', 'three'])
+  py3do vim.command("2,3d_"); return "REPLACED"
+  call assert_equal(['REPLACED'], getline(1, '$'))
+
+  call setline(1, ['one', 'two', 'three'])
+  2,3py3do vim.command("1,2d_"); return "REPLACED"
+  call assert_equal(['three'], getline(1, '$'))
+
   bwipe!
 
   " Check switching to another buffer does not trigger an ml_get error.
diff --git a/src/testdir/test_ruby.vim b/src/testdir/test_ruby.vim
index 2e0835c..f155168 100644
--- a/src/testdir/test_ruby.vim
+++ b/src/testdir/test_ruby.vim
@@ -11,10 +11,25 @@
 endfunc
 
 func Test_rubydo()
-  " Check deleting lines does not trigger ml_get error.
   new
+
+  " Check deleting lines does not trigger ml_get error.
   call setline(1, ['one', 'two', 'three'])
   rubydo Vim.command("%d_")
+  call assert_equal(['one'], getline(1, '$'))
+
+  call setline(1, ['one', 'two', 'three'])
+  rubydo Vim.command("1,2d_")
+  call assert_equal(['one'], getline(1, '$'))
+
+  call setline(1, ['one', 'two', 'three'])
+  rubydo Vim.command("2,3d_"); $_ = "REPLACED"
+  call assert_equal(['REPLACED'], getline(1, '$'))
+
+  call setline(1, ['one', 'two', 'three'])
+  2,3rubydo Vim.command("1,2d_"); $_ = "REPLACED"
+  call assert_equal(['three'], getline(1, '$'))
+
   bwipe!
 
   " Check switching to another buffer does not trigger ml_get error.
diff --git a/src/testdir/test_tcl.vim b/src/testdir/test_tcl.vim
index 4c6537f..68a6d63 100644
--- a/src/testdir/test_tcl.vim
+++ b/src/testdir/test_tcl.vim
@@ -11,10 +11,25 @@
 endfunc
 
 func Test_tcldo()
-  " Check deleting lines does not trigger ml_get error.
   new
+
+  " Check deleting lines does not trigger ml_get error.
   call setline(1, ['one', 'two', 'three'])
   tcldo ::vim::command %d_
+  call assert_equal(['one'], getline(1, '$'))
+
+  call setline(1, ['one', 'two', 'three'])
+  tcldo ::vim::command 1,2d_
+  call assert_equal(['one'], getline(1, '$'))
+
+  call setline(1, ['one', 'two', 'three'])
+  tcldo ::vim::command 2,3d_ ; set line REPLACED
+  call assert_equal(['REPLACED'], getline(1, '$'))
+
+  call setline(1, ['one', 'two', 'three'])
+  2,3tcldo ::vim::command 1,2d_ ; set line REPLACED
+  call assert_equal(['three'], getline(1, '$'))
+
   bwipe!
 
   " Check that switching to another buffer does not trigger ml_get error.