tests/wayland: Add DRM lease test scaffolding

Add the required files to run DRM lease using the KVM/tty backends.

DRM lease tests need at least one connector available for lease. Instead
of adding the test to "wayland-unit-tests.c", add it to its own file and
set the environment variable MUTTER_DEBUG_LEASE_CONNECTORS=Virtual-1 to
make the only connector created by VKMS by default available for lease.

This commit doesn't add any tests, just the required files to start
adding them.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4031>

src/tests/meson.build

@@ -578,6 +578,18 @@ wayland_test_cases = [
       'wayland-client-tests.c',
     ],
   },
+  {
+    'name': 'wayland-drm-lease',
+    'suite': 'wayland',
+    'sources': [
+      'wayland-drm-lease-tests.c',
+      wayland_test_utils,
+    ],
+    'variants': [['', test_env_variables + {'MUTTER_DEBUG_LEASE_CONNECTORS': 'Virtual-1'}]],
+    'depends': [
+      test_client_executables.get('drm-lease'),
+    ],
+  },
   {
     'name': 'wayland-fullscreen',
     'suite': 'wayland',

src/tests/wayland-drm-lease-tests.c

@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2024 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <glib.h>
+
+#include "backends/meta-monitor-config-manager.h"
+#include "backends/native/meta-backend-native.h"
+#include "backends/native/meta-kms.h"
+#include "backends/native/meta-kms-device.h"
+#include "meta-test/meta-context-test.h"
+#include "tests/meta-test-utils.h"
+#include "tests/meta-wayland-test-driver.h"
+#include "tests/meta-wayland-test-utils.h"
+
+static MetaContext *test_context;
+static MetaWaylandTestDriver *test_driver;
+
+static void
+test_drm_lease_client_connection (void)
+{
+  MetaWaylandTestClient *wayland_test_client;
+
+  wayland_test_client =
+    meta_wayland_test_client_new (test_context, "drm-lease");
+  meta_wayland_test_client_finish (wayland_test_client);
+}
+
+static void
+init_tests (void)
+{
+  g_test_add_func ("/wayland/drm-lease/client-connection",
+                   test_drm_lease_client_connection);
+}
+
+static void
+on_before_tests (void)
+{
+  MetaWaylandCompositor *compositor =
+    meta_context_get_wayland_compositor (test_context);
+  MetaBackend *backend = meta_context_get_backend (test_context);
+  MetaMonitorManager *monitor_manager =
+    meta_backend_get_monitor_manager (backend);
+  MetaKms *kms = meta_backend_native_get_kms (META_BACKEND_NATIVE (backend));
+  MetaKmsDevice *kms_device = meta_kms_get_devices (kms)->data;
+
+  test_driver = meta_wayland_test_driver_new (compositor);
+
+  meta_wayland_test_driver_set_property (test_driver,
+                                         "gpu-path",
+                                         meta_kms_device_get_path (kms_device));
+
+  meta_set_custom_monitor_config_full (backend,
+                                       "vkms-640x480.xml",
+                                       META_MONITORS_CONFIG_FLAG_NONE);
+
+  meta_monitor_manager_reload (monitor_manager);
+}
+
+static void
+on_after_tests (void)
+{
+  g_clear_object (&test_driver);
+}
+
+int
+main (int   argc,
+      char *argv[])
+{
+  g_autoptr (MetaContext) context = NULL;
+
+#ifndef MUTTER_PRIVILEGED_TEST
+  return 0;
+#endif
+
+  context = meta_create_test_context (META_CONTEXT_TEST_TYPE_VKMS,
+                                      META_CONTEXT_TEST_FLAG_NO_X11);
+  g_assert (meta_context_configure (context, &argc, &argv, NULL));
+
+  test_context = context;
+
+  init_tests ();
+
+  g_signal_connect (context, "before-tests",
+                    G_CALLBACK (on_before_tests), NULL);
+  g_signal_connect (context, "after-tests",
+                    G_CALLBACK (on_after_tests), NULL);
+
+  return meta_context_test_run_tests (META_CONTEXT_TEST (context),
+                                      META_TEST_RUN_FLAG_NONE);
+}

src/tests/wayland-test-clients/drm-lease.c

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2024 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+
+int
+main (int    argc,
+      char **argv)
+{
+  return EXIT_SUCCESS;
+}

src/tests/wayland-test-clients/meson.build

@@ -21,6 +21,9 @@ wayland_test_clients = [
   {
     'name': 'dma-buf-scanout',
   },
+  {
+    'name': 'drm-lease',
+  },
   {
     'name': 'fractional-scale',
   },