DAP is to debugging that LSP is to coding. For Emacs, Dape¹ is to dap-mode that Eglot is to lsp-mode.

It took me longer than it should’ve, but, I’ve now confiused Dape for both Python code execution debugging and test debugging². There’s not a huge amount of examples of this configuration around, so I’m sharing it here to help others.

I’ve based my configs on the default ones for Python, and then hastily adapted them. If you want to use verbose modes for pytest, you could add "-v" to the args list for the pytest config.

  (add-to-list 'dape-configs
               `(pytest modes (python-mode python-ts-mode)
                        ensure (lambda (config) (dape-ensure-command config)
                                 (let ((python (dape-config-get config 'command)))
                                   (unless
                                       (zerop
                                        (call-process-shell-command
                                         (format "%s -c \"import debugpy.adapter\"" python)))
                                     (user-error "%s module debugpy is not installed"
                                                 python))))
                        command dap-python-executable
                        command-args ("-m" "debugpy.adapter" "--host" "0.0.0.0" "--port" :autoport)
                        port :autoport
                        :request "launch"
                        :type "python"
                        :mode "test"
                        :cwd dape-cwd
                        :module "pytest"
                        :args [dape-buffer-default]
                        :justMyCode nil
                        :console "integratedTerminal"
                        :showReturnValue t
                        :stopOnEntry nil))