tidy hi-test name

lua/nvim-tree/api.lua

@@ -2,7 +2,7 @@ local core = require("nvim-tree.core")
 local view = require("nvim-tree.view")
 local utils = require("nvim-tree.utils")
 local actions = require("nvim-tree.actions")
-local appearance_diagnostics = require("nvim-tree.appearance.diagnostics")
+local appearance_hi_test = require("nvim-tree.appearance.hi-test")
 local events = require("nvim-tree.events")
 local help = require("nvim-tree.help")
 local keymap = require("nvim-tree.keymap")
@@ -305,7 +305,7 @@ Api.config.mappings.get_keymap = wrap(keymap.get_keymap)
 Api.config.mappings.get_keymap_default = wrap(keymap.get_keymap_default)
 Api.config.mappings.default_on_attach = keymap.default_on_attach
 
-Api.diagnostics.hi_test = wrap(appearance_diagnostics.hi_test)
+Api.diagnostics.hi_test = wrap(appearance_hi_test)
 
 Api.commands.get = wrap(function()
   return require("nvim-tree.commands").get()

lua/nvim-tree/appearance/hi-test.lua

@@ -5,8 +5,6 @@ local Class = require("nvim-tree.classic")
 -- others with name and links less than this arbitrary value are short
 local SHORT_LEN = 50
 
-local M = {}
-
 ---@class (exact) HighlightDisplay: Class for :NvimTreeHiTest
 ---@field group string nvim-tree highlight group name
 ---@field links string link chain to a concretely defined group
@@ -90,7 +88,7 @@ end
 
 ---Run a test similar to :so $VIMRUNTIME/syntax/hitest.vim
 ---Display all nvim-tree and neovim highlight groups, their link chain and actual definition
-function M.hi_test()
+return function()
   -- create a buffer
   local bufnr = vim.api.nvim_create_buf(false, true)
 
@@ -140,5 +138,3 @@ function M.hi_test()
 
   vim.cmd.buffer(bufnr)
 end
-
-return M