meson,data: generate test service file

The test service file is used in the test-plugin-generic unit tests,
which require the ModemManager daemon to be launched in a private test
DBus session.

data/meson.build

@@ -1,6 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 # Copyright (C) 2021 Iñigo Martinez <inigomartinez@gmail.com>
 
+subdir('tests')
+
 service_conf = {
   'sbindir': mm_prefix / mm_sbindir,
   'MM_POLKIT_SERVICE': (enable_polkit ? 'polkit.service' : ''),

data/tests/meson.build

@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (C) 2022 Aleksander Morgado <aleksander@aleksander.es>
+
+test_conf = {
+  'abs_top_builddir': build_root,
+  'PLUGIN_BUILD_SUBDIR': 'plugins/',
+}
+
+configure_file(
+  input: 'org.freedesktop.ModemManager1.service.in',
+  output: '@BASENAME@',
+  configuration: test_conf,
+)

data/tests/org.freedesktop.ModemManager1.service.in

@@ -2,4 +2,4 @@
 
 [D-BUS Service]
 Name=org.freedesktop.ModemManager1
-Exec=@abs_top_builddir@/src/ModemManager --test-session --no-auto-scan --test-enable --test-plugin-dir="@abs_top_builddir@/plugins/.libs" --debug
+Exec=@abs_top_builddir@/src/ModemManager --test-session --no-auto-scan --test-enable --test-plugin-dir="@abs_top_builddir@/@PLUGIN_BUILD_SUBDIR@" --debug