Tried using dape recently with Go and managed to get it to debug Go tests. Sharing the snippet incase its helpful for others (requires go treesitter).

  (setq treesit-go-tests-query (treesit-query-compile 'go
                                                      '((function_declaration
                                                         name: (identifier) @testname
                                                         parameters: (parameter_list :anchor (parameter_declaration type: (pointer_type) @type :anchor))
                                                         (:match "*testing.\\(T\\|M\\)" @type) (:match "^Test.+$" @testname)) @parent)))
  (defun jake/query-go-test-nodes ()
    (when (treesit-ready-p 'go)
      (treesit-query-capture (treesit-buffer-root-node) treesit-go-tests-query)))

  (defun jake/completing-read-go-tests ()
    (let* ((test-matches (jake/query-go-test-nodes))
           (test-name-matches (cl-remove-if-not (lambda (match) (eq (car match) 'testname)) test-matches))
           (test-names (mapcar (lambda (match) (treesit-node-text (cdr match))) test-name-matches)))
      (completing-read "Test:" test-names nil t)))


  (defun jake/dape--select-go-test-args ()
    (when-let* ((test-name (jake/completing-read-go-tests))
                (test-regexp (concat "^" test-name "$")))
      (if test-name
          `["-test.run" ,test-regexp]
        (error "No test selected"))))

  (defun jake/file-relative-dir ()
    "Return the file directory relative to dape's cwd. This is used by Delve debugger."
    (concat "./" (file-relative-name default-directory (funcall dape-cwd-fn))))

;; inside your dape-config
(add-to-list 'dape-configs
               `(test
                 modes (go-mode go-ts-mode)
                 command "dlv"
                 command-cwd dape-cwd-fn
                 command-args ("dap" "--listen" "127.0.0.1:55878")
                 host "127.0.0.1"
                 port 55878
                 :type "go"
                 :name "debug test"
                 :request "launch"
                 :mode "test"
                 :cwd dape-cwd-fn
                 :program jake/file-relative-dir
                 :args jake/dape--select-go-test-args))