tests: Add persistent virtual monitor test

Tests that it is added correctly, and that we shut down cleanly.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1698>

src/tests/meson.build

@@ -209,6 +209,20 @@ if have_native_tests
     install: have_installed_tests,
     install_dir: mutter_installed_tests_libexecdir,
   )
+
+  native_persistent_virtual_monitor = executable(
+    'mutter-persistent-virtual-monitor',
+    sources: [
+      'native-persistent-virtual-monitor.c',
+      'test-utils.c',
+      'test-utils.h',
+    ],
+    include_directories: tests_includepath,
+    c_args: tests_c_args,
+    dependencies: [tests_deps],
+    install: have_installed_tests,
+    install_dir: mutter_installed_tests_libexecdir,
+  )
 endif
 
 stacking_tests = [
@@ -292,4 +306,11 @@ if have_native_tests
     is_parallel: false,
     timeout: 60,
   )
+
+  test('native-persistent-virtual-monitor', native_persistent_virtual_monitor,
+    suite: ['core', 'mutter/native/persistent-virtual-monitor'],
+    env: test_env,
+    is_parallel: false,
+    timeout: 60,
+  )
 endif

src/tests/native-persistent-virtual-monitor.c

@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2021 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ *
+ */
+
+#include "config.h"
+
+#include "backends/meta-logical-monitor.h"
+#include "backends/meta-monitor-manager-private.h"
+#include "compositor/meta-plugin-manager.h"
+#include "meta/main.h"
+#include "meta/meta-backend.h"
+#include "tests/test-utils.h"
+
+static gboolean
+wait_for_paint (gpointer data)
+{
+  MetaBackend *backend = meta_get_backend ();
+  ClutterActor *stage = meta_backend_get_stage (backend);
+  MetaMonitorManager *monitor_manager =
+    meta_backend_get_monitor_manager (backend);
+  GMainLoop *loop;
+  GList *monitors;
+  GList *logical_monitors;
+  MetaLogicalMonitor *logical_monitor;
+  MetaRectangle layout;
+
+  loop = g_main_loop_new (NULL, FALSE);
+  g_signal_connect_swapped (stage, "presented",
+                            G_CALLBACK (g_main_loop_quit),
+                            loop);
+  clutter_actor_queue_redraw (stage);
+
+  monitors = meta_monitor_manager_get_monitors (monitor_manager);
+  g_assert_cmpint (g_list_length (monitors), ==, 1);
+
+  logical_monitors =
+    meta_monitor_manager_get_logical_monitors (monitor_manager);
+  g_assert_cmpint (g_list_length (logical_monitors), ==, 1);
+
+  logical_monitor = logical_monitors->data;
+  g_assert (meta_logical_monitor_get_monitors (logical_monitor)->data ==
+            monitors->data);
+
+  layout = meta_logical_monitor_get_layout (logical_monitor);
+  g_assert_cmpint (layout.x, ==, 0);
+  g_assert_cmpint (layout.y, ==, 0);
+  g_assert_cmpint (layout.width, ==, 800);
+  g_assert_cmpint (layout.height, ==, 600);
+
+  g_main_loop_run (loop);
+
+  meta_quit (META_EXIT_SUCCESS);
+
+  return G_SOURCE_REMOVE;
+}
+
+int
+main (int    argc,
+      char **argv)
+{
+  char *fake_args[] = {
+      NULL,
+      (char *) "--wayland",
+      (char *) "--headless",
+      (char *) "--virtual-monitor",
+      (char *) "800x600",
+  };
+  char **fake_argv = fake_args;
+  int fake_argc = G_N_ELEMENTS (fake_args);
+  GOptionContext *ctx;
+  GError *error = NULL;
+
+  test_init (&argc, &argv);
+
+  fake_args[0] = argv[0];
+
+  ctx = meta_get_option_context ();
+  if (!g_option_context_parse (ctx, &fake_argc, &fake_argv, &error))
+    g_error ("Failed to parse fake command line arguments: %s", error->message);
+  g_option_context_free (ctx);
+
+  meta_plugin_manager_load (test_get_plugin_name ());
+
+  meta_init ();
+  meta_register_with_session ();
+
+  g_idle_add (wait_for_paint, NULL);
+
+  return meta_run ();
+}