diff --git a/src/testdir/test_highlight.vim b/src/testdir/test_highlight.vim
index 3400052..ef9c70e 100644
--- a/src/testdir/test_highlight.vim
+++ b/src/testdir/test_highlight.vim
@@ -888,8 +888,8 @@
 
 " Test for setting various 'term' attributes
 func Test_highlight_term_attr()
-  hi HlGrp3 term=bold,underline,undercurl,strikethrough,reverse,italic,standout
-  call assert_equal('hi HlGrp3          term=bold,standout,underline,undercurl,italic,reverse,strikethrough', HighlightArgs('HlGrp3'))
+  hi HlGrp3 term=bold,underline,undercurl,underdouble,underdotted,underdashed,strikethrough,reverse,italic,standout
+  call assert_equal('hi HlGrp3          term=bold,standout,underline,undercurl,underdouble,underdotted,underdashed,italic,reverse,strikethrough', HighlightArgs('HlGrp3'))
   hi HlGrp3 term=NONE
   call assert_equal('hi HlGrp3          cleared', HighlightArgs('HlGrp3'))
   hi clear
@@ -1174,12 +1174,14 @@
   " Test for setting all the 'term', 'cterm' and 'gui' attributes of a
   " highlight group
   let lines =<< trim END
-    VAR attr = {'bold': v:true, 'underline': v:true, 'undercurl': v:true,
+    VAR attr = {'bold': v:true, 'underline': v:true,
+                \ 'undercurl': v:true, 'underdouble': v:true,
+                \ 'underdotted': v:true, 'underdashed': v:true,
                 \ 'strikethrough': v:true, 'reverse': v:true, 'italic': v:true,
                 \ 'standout': v:true, 'nocombine': v:true}
     call hlset([{'name': 'myhlg2', 'term': attr, 'cterm': attr, 'gui': attr}])
     VAR id2 = hlID('myhlg2')
-    VAR expected = "myhlg2 xxx term=bold,standout,underline,undercurl,italic,reverse,nocombine,strikethrough cterm=bold,standout,underline,undercurl,italic,reverse,nocombine,strikethrough gui=bold,standout,underline,undercurl,italic,reverse,nocombine,strikethrough"
+    VAR expected = "myhlg2 xxx term=bold,standout,underline,undercurl,underdouble,underdotted,underdashed,italic,reverse,nocombine,strikethrough cterm=bold,standout,underline,undercurl,underdouble,underdotted,underdashed,italic,reverse,nocombine,strikethrough gui=bold,standout,underline,undercurl,underdouble,underdotted,underdashed,italic,reverse,nocombine,strikethrough"
     VAR output = execute('highlight myhlg2')
     LET output = output->split("\n")->join()->substitute('\s\+', ' ', 'g')
     call assert_equal(expected, output)
diff --git a/src/testdir/test_options.vim b/src/testdir/test_options.vim
index 0a53315..fbe592d 100644
--- a/src/testdir/test_options.vim
+++ b/src/testdir/test_options.vim
@@ -955,6 +955,18 @@
   set <F9>=xyz
   call assert_equal('xyz', &t_k9)
   set <t_k9>&
+
+  " should we test all of them?
+  set t_Ce=testCe
+  set t_Cs=testCs
+  set t_Us=testUs
+  set t_ds=testds
+  set t_Ds=testDs
+  call assert_equal('testCe', &t_Ce)
+  call assert_equal('testCs', &t_Cs)
+  call assert_equal('testUs', &t_Us)
+  call assert_equal('testds', &t_ds)
+  call assert_equal('testDs', &t_Ds)
 endfunc
 
 " Test for changing options in a sandbox
diff --git a/src/testdir/test_syn_attr.vim b/src/testdir/test_syn_attr.vim
index db9c9e9..366f39f 100644
--- a/src/testdir/test_syn_attr.vim
+++ b/src/testdir/test_syn_attr.vim
@@ -11,10 +11,17 @@
   hi Mine term=reverse cterm=inverse
   call assert_equal('1', synIDattr(hlID("Mine"), "reverse", 'term'))
   call assert_equal('1', synIDattr(hlID("Mine"), "inverse", 'cterm'))
+
   hi Mine term=underline cterm=standout gui=undercurl
   call assert_equal('1', synIDattr(hlID("Mine"), "underline", 'term'))
   call assert_equal('1', synIDattr(hlID("Mine"), "standout", 'cterm'))
   call assert_equal('1', synIDattr("Mine"->hlID(), "undercurl", 'gui'))
+
+  hi Mine term=underdouble cterm=underdotted gui=underdashed
+  call assert_equal('1', synIDattr(hlID("Mine"), "underdouble", 'term'))
+  call assert_equal('1', synIDattr(hlID("Mine"), "underdotted", 'cterm'))
+  call assert_equal('1', synIDattr("Mine"->hlID(), "underdashed", 'gui'))
+
   hi Mine gui=strikethrough
   call assert_equal('1', synIDattr(hlID("Mine"), "strikethrough", 'gui'))
   hi Mine term=NONE cterm=NONE gui=NONE