feat: detect nested go projects

lua/neotest-golang/init.lua

@@ -12,10 +12,8 @@ M.Adapter = { name = "neotest-golang" }
 ---@param dir string @Directory to treat as cwd
 ---@return string | nil @Absolute root dir of test suite
 function M.Adapter.root(dir)
-  ---@type string | nil
-  local cwd = lib.files.match_root_pattern("go.mod", "go.sum")(dir)
-  if cwd == nil then
-    return
+  if M.find_go_files(vim.fn.getcwd(), 100) then -- TODO: make depth configurable
+    return dir
   end
 end
 
@@ -322,6 +320,32 @@ function M.Adapter.results(spec, result, tree)
   return results
 end
 
+--@param root_path string @Root path of project
+--@param depth number @Maximum depth to search for go.mod or go.sum
+function M.find_go_files(root_path, depth)
+  local stack = { { root_path, 0 } }
+  while #stack > 0 do
+    local top = table.remove(stack)
+    local dir = top[1]
+    local level = top[2]
+    if level > depth then
+      return false
+    end
+    local files = vim.fn.globpath(dir, "*", true, true)
+    for _, file in ipairs(files) do
+      if vim.fn.isdirectory(file) == 1 then
+        table.insert(stack, { file, level + 1 })
+      elseif
+        vim.fn.fnamemodify(file, ":t") == "go.mod"
+        or vim.fn.fnamemodify(file, ":t") == "go.sum"
+      then
+        return true
+      end
+    end
+  end
+  return false
+end
+
 --- Build runspec for a single test
 ---@param pos neotest.Position
 ---@param strategy string