diff --git a/src/testdir/test_autocmd.vim b/src/testdir/test_autocmd.vim
index 531aa6b..d6f8ef4 100644
--- a/src/testdir/test_autocmd.vim
+++ b/src/testdir/test_autocmd.vim
@@ -1279,8 +1279,8 @@
   call assert_equal(g:opt[0], g:opt[1])
 
   " 14: Setting option backspace through :let"
-  let g:options = [['backspace', '', '', '', 'eol,indent,start', 'global', 'set']]
-  let &bs = "eol,indent,start"
+  let g:options = [['backspace', 'indent,eol,start', 'indent,eol,start', 'indent,eol,start', '', 'global', 'set']]
+  let &bs = ''
   call assert_equal([], g:options)
   call assert_equal(g:opt[0], g:opt[1])
 
diff --git a/src/testdir/test_digraph.vim b/src/testdir/test_digraph.vim
index 3312faf..16eb0b1 100644
--- a/src/testdir/test_digraph.vim
+++ b/src/testdir/test_digraph.vim
@@ -250,9 +250,12 @@
   call Put_Dig_BS("P","=")
   call assert_equal(['Р']+repeat(["₽"],2)+['П'], getline(line('.')-3,line('.')))
   " Not a digraph: this is different from <c-k>!
+  let _bs = &bs
+  set bs=
   call Put_Dig_BS("a","\<bs>")
   call Put_Dig_BS("\<bs>","a")
   call assert_equal(['','a'], getline(line('.')-1,line('.')))
+  let &bs = _bs
   " Grave
   call Put_Dig_BS("a","!")
   call Put_Dig_BS("!","e")
diff --git a/src/testdir/test_ins_complete.vim b/src/testdir/test_ins_complete.vim
index fd4c7cd..7829f79 100644
--- a/src/testdir/test_ins_complete.vim
+++ b/src/testdir/test_ins_complete.vim
@@ -1431,7 +1431,7 @@
   set completefunc=Tcomplete
   exe "normal! iup\<C-X>\<C-U>\<BS>\<BS>\<BS>\<BS>\<BS>"
   call assert_equal('up', getline(1))
-  call assert_equal(2, g:CallCount)
+  call assert_equal(6, g:CallCount)
   set completeopt&
   set completefunc&
   bw!
diff --git a/src/testdir/test_options.vim b/src/testdir/test_options.vim
index fa75204..cd66cdf 100644
--- a/src/testdir/test_options.vim
+++ b/src/testdir/test_options.vim
@@ -486,7 +486,7 @@
   " but don't exhaustively validate their results.
   call assert_equal('single', getcompletion('set ambw=', 'cmdline')[0])
   call assert_match('light\|dark', getcompletion('set bg=', 'cmdline')[1])
-  call assert_equal('indent', getcompletion('set backspace=', 'cmdline')[0])
+  call assert_equal('indent,eol,start', getcompletion('set backspace=', 'cmdline')[0])
   call assert_equal('yes', getcompletion('set backupcopy=', 'cmdline')[1])
   call assert_equal('backspace', getcompletion('set belloff=', 'cmdline')[1])
   call assert_equal('min:', getcompletion('set briopt=', 'cmdline')[1])