fix: check real paths of buffers

Buf names can contain the wrong type of file separators

See #141

lua/neotest/adapters/init.lua

@@ -34,12 +34,14 @@ function AdapterGroup:adapters_matching_open_bufs(existing_roots)
   local buffers = async.api.nvim_list_bufs()
 
   local paths = lib.func_util.map(function(i, buf)
-    return i, async.fn.fnamemodify(async.fn.bufname(buf), ":p")
+    local path = async.api.nvim_buf_get_name(buf)
+    local real = lib.files.path.real(path)
+    return i, real or false
   end, buffers)
 
   local matched_files = {}
   for _, path in ipairs(paths) do
-    if not is_under_roots(path) then
+    if path and not is_under_roots(path) then
       for _, adapter in ipairs(self:_path_adapters(path)) do
         if adapter.is_test_file(path) and not matched_files[path] then
           logger.info("Adapter", adapter.name, "matched buffer", path)

lua/neotest/client/init.lua

@@ -444,7 +444,8 @@ end
 function NeotestClient:_update_open_buf_positions(adapter_id)
   local adapter = self._adapters[adapter_id]
   for _, bufnr in ipairs(async.api.nvim_list_bufs()) do
-    local file_path = async.api.nvim_buf_get_name(bufnr)
+    local name = async.api.nvim_buf_get_name(bufnr)
+    local file_path = lib.files.path.real(name) or name
     if adapter.is_test_file(file_path) then
       self:_update_positions(file_path, { adapter = adapter_id })
     end

lua/neotest/consumers/diagnostic.lua

@@ -1,3 +1,4 @@
+local lib = require("neotest.lib")
 local logger = require("neotest.logging")
 local async = require("neotest.async")
 
@@ -198,8 +199,11 @@ local function init(client)
     --- vimscript call to bufnr, we create the set of buffers that are loaded and check against that.
     local valid_bufs = {}
     for _, bufnr in ipairs(async.api.nvim_list_bufs()) do
-      local bufpath = async.fn.fnamemodify(async.api.nvim_buf_get_name(bufnr), ":p")
-      valid_bufs[bufpath] = true
+      local name = async.api.nvim_buf_get_name(bufnr)
+      local bufpath, _ = lib.files.path.real(name)
+      if bufpath then
+        valid_bufs[bufpath] = true
+      end
     end
 
     for pos_id, _ in pairs(results) do

lua/neotest/consumers/run.lua

@@ -23,8 +23,7 @@ function neotest.run.get_tree_from_args(args, store)
       return client:get_position(nil, args)
     end
     if args[1] then
-      local position_id = lib.files.exists(args[1]) and async.fn.fnamemodify(args[1], ":p")
-        or args[1]
+      local position_id = lib.files.path.real(args[1]) or args[1]
       return client:get_position(position_id, args)
     end
     local file_path = async.fn.expand("%:p")

lua/neotest/lib/file/init.lua

@@ -176,6 +176,15 @@ M.sep = (function()
   return res
 end)()
 
+M.path = {
+  sep = M.sep,
+  exists = M.exists,
+  real = function(path)
+    local err, real = async.uv.fs_realpath(path)
+    return real, err
+  end,
+}
+
 ---@type fun(path: string): string
 M.detect_filetype = fu.memoize(filetype.detect)