tests: Adjust to SRFI-64 as found in Guile 3.0.7.

In Guile 3.0.7, 'test-runner-current' is set to #f upon 'test-end'.
Consequently, the previous strategy, where we'd call
'test-runner-current' after 'test-end', no longer works.  Instead, set
the test runner in each test right before 'test-begin'.

* gnu/build/marionette.scm (system-test-runner): New procedure.
* gnu/tests/audio.scm (run-mpd-test): Replace (exit (= ...)) idiom
by (test-runner-current (system-test-runner)).
* gnu/tests/base.scm (run-basic-test)
(run-cleanup-test, run-mcron-test, run-nss-mdns-test): Likewise.
* gnu/tests/ci.scm (run-laminar-test): Likewise.
* gnu/tests/cups.scm (run-cups-test): Likewise.
* gnu/tests/databases.scm (run-memcached-test)
(run-postgresql-test, run-mysql-test): Likewise.
* gnu/tests/desktop.scm (run-elogind-test): Likewise.
* gnu/tests/dict.scm (run-dicod-test): Likewise.
* gnu/tests/docker.scm (run-docker-test): Likewise.
(run-docker-system-test): Likewise.
* gnu/tests/file-sharing.scm (run-transmission-daemon-test): Likewise.
* gnu/tests/ganeti.scm (run-ganeti-test): Likewise.
* gnu/tests/guix.scm (run-guix-build-coordinator-test): Likewise.
(run-guix-data-service-test): Likewise.
* gnu/tests/ldap.scm (run-ldap-test): Likewise.
* gnu/tests/linux-modules.scm (run-loadable-kernel-modules-test-base): Likewise.
* gnu/tests/mail.scm (run-opensmtpd-test)
(run-exim-test, run-dovecot-test, run-getmail-test): Likewise.
* gnu/tests/messaging.scm (run-xmpp-test)
(run-bitlbee-test, run-quassel-test): Likewise.
* gnu/tests/monitoring.scm (run-prometheus-node-exporter-server-test)
(run-zabbix-server-test): Likewise.
* gnu/tests/networking.scm (run-inetd-test, run-openvswitch-test)
(run-dhcpd-test, run-tor-test, run-iptables-test, run-ipfs-test): Likewise.
* gnu/tests/nfs.scm (run-nfs-test)
(run-nfs-server-test, run-nfs-root-fs-test): Likewise.
* gnu/tests/package-management.scm (run-nix-test): Likewise.
* gnu/tests/reconfigure.scm (run-switch-to-system-test)
(run-upgrade-services-test, run-install-bootloader-test): Likewise.
* gnu/tests/rsync.scm (run-rsync-test): Likewise.
* gnu/tests/security-token.scm (run-pcscd-test): Likewise.
* gnu/tests/singularity.scm (run-singularity-test): Likewise.
* gnu/tests/ssh.scm (run-ssh-test): Likewise.
* gnu/tests/telephony.scm (run-jami-test): Likewise.
* gnu/tests/version-control.scm (run-cgit-test): Likewise.
(run-git-http-test, run-gitolite-test, run-gitile-test): Likewise.
* gnu/tests/virtualization.scm (run-libvirt-test, run-childhurd-test): Likewise.
* gnu/tests/web.scm (run-webserver-test, run-php-fpm-test)
(run-hpcguix-web-server-test, run-tailon-test, run-patchwork-test): Likewise.

gnu/build/marionette.scm

@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2016, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2016, 2017, 2018, 2019, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2018 Chris Marusich <cmmarusich@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
@@ -20,6 +20,7 @@
 (define-module (gnu build marionette)
   #:use-module (srfi srfi-9)
   #:use-module (srfi srfi-26)
+  #:use-module (srfi srfi-64)
   #:use-module (rnrs io ports)
   #:use-module (ice-9 match)
   #:use-module (ice-9 popen)
@@ -33,7 +34,9 @@
             marionette-screen-text
             wait-for-screen-text
             %qwerty-us-keystrokes
-            marionette-type))
+            marionette-type
+
+            system-test-runner))
 
 ;;; Commentary:
 ;;;
@@ -358,4 +361,21 @@ to actual keystrokes."
   (for-each (cut marionette-control <> marionette)
             (string->keystroke-commands str keystrokes)))
 
+
+;;;
+;;; Test helper.
+;;;
+
+(define (system-test-runner)
+  "Return a SRFI-64 test runner that calls 'exit' upon 'test-end'."
+  (let ((runner  (test-runner-simple)))
+    ;; On 'test-end', display test results and exit with zero if and only if
+    ;; there were no test failures.
+    (test-runner-on-final! runner
+      (lambda (runner)
+        (let ((success? (= (test-runner-fail-count runner) 0)))
+          (test-on-final-simple runner)
+          (exit success?))))
+    runner))
+
 ;;; marionette.scm ends here