From 4cb3fb0f1532de3465962903a1697339ad3d6159 Mon Sep 17 00:00:00 2001
From: Jackson Moore <jacksonmoore@tuta.io>
Date: Fri, 4 Sep 2026 14:24:35 +0200
Subject: Translate window-local highlights

---
 tests/run.lua | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)

(limited to 'tests/run.lua')

diff --git a/tests/run.lua b/tests/run.lua
index 8c3c771..64c12d6 100644
--- a/tests/run.lua
+++ b/tests/run.lua
@@ -361,6 +361,96 @@ test("ActionOutcome and DotPayload retain resolved result data", function()
   same("problem", domain.ActionOutcome.error(destination, "problem").diagnostic)
 end)
 
+test("Host adapter materializes window-local highlight resources", function()
+  local groups = { Existing = { fg = 7 } }
+  local added = {}
+  local deleted = {}
+  local next_match = 1000
+  local runtime = {
+    api = {
+      nvim_get_hl = function(_, options)
+        return vim.deepcopy(groups[options.name] or {})
+      end,
+      nvim_set_hl = function(_, name, definition)
+        groups[name] = vim.deepcopy(definition)
+      end,
+    },
+    fn = {
+      hlexists = function(name)
+        return groups[name] ~= nil and 1 or 0
+      end,
+      matchaddpos = function(group, positions, priority, id, options)
+        local match_id = next_match
+        next_match = next_match + 1
+        added[#added + 1] = {
+          group = group,
+          positions = positions,
+          priority = priority,
+          id = id,
+          window = options.window,
+          match_id = match_id,
+        }
+        return match_id
+      end,
+      matchdelete = function(match_id, window)
+        deleted[#deleted + 1] = { match_id = match_id, window = window }
+        return 0
+      end,
+    },
+  }
+  local adapter = host_adapter.new({ runtime = runtime })
+
+  same(7, adapter:read_highlight_group("Existing").fg)
+  same(nil, adapter:read_highlight_group("Missing"))
+  falsy(adapter:define_highlight_group(
+    "Existing",
+    { guifg = "red" },
+    { default = true }
+  ))
+  truthy(adapter:define_highlight_group("CleverFDefaultLabel", {
+    guifg = "red",
+    guibg = "NONE",
+    gui = { bold = true, underline = true },
+    ctermfg = "red",
+    ctermbg = "NONE",
+    cterm = { bold = true, underline = true },
+  }, { default = true }))
+  same("red", groups.CleverFDefaultLabel.fg)
+  same("NONE", groups.CleverFDefaultLabel.bg)
+  truthy(groups.CleverFDefaultLabel.bold)
+  truthy(groups.CleverFDefaultLabel.underline)
+  truthy(groups.CleverFDefaultLabel.default)
+
+  local cursor = adapter:create_highlight({
+    group = "CleverFCursor",
+    window = 42,
+    position = domain.Position.new(3, 5),
+    priority = "high",
+  })
+  local character = adapter:create_highlight({
+    group = "CleverFChar",
+    window = 51,
+    positions = {},
+    priority = "ordinary",
+  })
+  same(2, #added)
+  list_same({ 3, 5 }, added[1].positions[1])
+  same(100, added[1].priority)
+  same(42, added[1].window)
+  list_same({ 0 }, added[2].positions[1])
+  same(10, added[2].priority)
+  same(51, added[2].window)
+
+  truthy(adapter:remove_highlight(cursor))
+  truthy(adapter:remove_highlight(character))
+  falsy(adapter:remove_highlight(character))
+  same(2, #deleted)
+  same(1000, deleted[1].match_id)
+  same(42, deleted[1].window)
+  same(1001, deleted[2].match_id)
+  same(51, deleted[2].window)
+end)
+
 test("Host adapter translates typed action outcomes to Nvim effects", function()
   local effects = {}
   local runtime = {
-- 
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