1 files changed, 25 insertions, 16 deletions
diff --git a/test/functional/api/highlight_spec.lua b/test/functional/api/highlight_spec.lua
index 2730f7e23d..5941d4c68b 100644
--- a/test/functional/api/highlight_spec.lua
+++ b/test/functional/api/highlight_spec.lua
@@ -11,6 +11,9 @@ local ok = helpers.ok
 local assert_alive = helpers.assert_alive
 
 describe('API: highlight',function()
+  clear()
+  Screen.new() -- initialize Screen.colors
+
   local expected_rgb = {
     background = Screen.colors.Yellow,
     foreground = Screen.colors.Red,
@@ -29,13 +32,16 @@ describe('API: highlight',function()
     italic = true,
     reverse = true,
     underline = true,
-    undercurl = true,
-    underdouble = true,
-    underdotted = true,
-    underdashed = true,
     strikethrough = true,
+    altfont = true,
     nocombine = true,
   }
+  local expected_undercurl = {
+    background = Screen.colors.Yellow,
+    foreground = Screen.colors.Red,
+    special = Screen.colors.Blue,
+    undercurl = true,
+  }
 
   before_each(function()
     clear()
@@ -56,9 +62,13 @@ describe('API: highlight',function()
     eq('Invalid highlight id: 30000', string.match(emsg, 'Invalid.*'))
 
     -- Test all highlight properties.
-    command('hi NewHighlight gui=underline,bold,undercurl,underdouble,underdotted,underdashed,italic,reverse,strikethrough,nocombine')
+    command('hi NewHighlight gui=underline,bold,italic,reverse,strikethrough,altfont,nocombine')
     eq(expected_rgb2, nvim("get_hl_by_id", hl_id, true))
 
+    -- Test undercurl
+    command('hi NewHighlight gui=undercurl')
+    eq(expected_undercurl, nvim("get_hl_by_id", hl_id, true))
+
     -- Test nil argument.
     err, emsg = pcall(meths.get_hl_by_id, { nil }, false)
     eq(false, err)
@@ -204,17 +214,14 @@ describe("API: set highlight", function()
     bold = true,
     italic = true,
     reverse = true,
-    undercurl = true,
     underline = true,
-    underdashed = true,
-    underdotted = true,
-    underdouble = true,
     strikethrough = true,
+    altfont = true,
     cterm = {
       italic = true,
       reverse = true,
-      undercurl = true,
       strikethrough = true,
+      altfont = true,
       nocombine = true,
     }
   }
@@ -224,20 +231,17 @@ describe("API: set highlight", function()
     bold = true,
     italic = true,
     reverse = true,
-    undercurl = true,
     underline = true,
-    underdashed = true,
-    underdotted = true,
-    underdouble = true,
     strikethrough = true,
+    altfont = true,
   }
   local highlight3_result_cterm = {
     background = highlight_color.ctermbg,
     foreground = highlight_color.ctermfg,
     italic = true,
     reverse = true,
-    undercurl = true,
     strikethrough = true,
+    altfont = true,
     nocombine = true,
   }
 
@@ -293,7 +297,7 @@ describe("API: set highlight", function()
       exec_capture('highlight Test_hl'))
 
     meths.set_hl(0, 'Test_hl2', highlight3_config)
-    eq('Test_hl2       xxx cterm=undercurl,italic,reverse,strikethrough,nocombine ctermfg=8 ctermbg=15 gui=bold,underline,undercurl,underdouble,underdotted,underdashed,italic,reverse,strikethrough guifg=#ff0000 guibg=#0032aa',
+    eq('Test_hl2       xxx cterm=italic,reverse,strikethrough,altfont,nocombine ctermfg=8 ctermbg=15 gui=bold,underline,italic,reverse,strikethrough,altfont guifg=#ff0000 guibg=#0032aa',
       exec_capture('highlight Test_hl2'))
 
     -- Colors are stored with the name they are defined, but
@@ -354,4 +358,9 @@ describe("API: set highlight", function()
     meths.set_hl(0, 'Normal', {fg='#000083', bg='#0000F3'})
     eq({foreground = 131, background = 243}, nvim("get_hl_by_name", 'Normal', true))
   end)
+
+  it('does not segfault on invalid group name #20009', function()
+    eq('Invalid highlight name: foo bar', pcall_err(meths.set_hl, 0, 'foo bar', {bold = true}))
+    assert_alive()
+  end)
 end)