[PATCH 4/5] test: save buffer content to file instead of printing it in Emacs tests

Before the change, the common Emacs test scheme was to print buffer content to stdout and redirect it to a file or capture it in a shell variable. This does not work if we switch to using emacsclient(1) for running the tests, because you can not print to the stdout in this case. (Actually, you can

[PATCH 4/5] test: save buffer content to file instead of printing it in Emacs tests

Before the change, the common Emacs test scheme was to print buffer content to stdout and redirect it to a file or capture it in a shell variable. This does not work if we switch to using emacsclient(1) for running the tests, because you can not print to the stdout in this case. (Actually, you can