tests: Add a11y mouse keys test

This test tests two things:

 1. That launching mutter with a connected keyboard (created via uinput
    before initializing mutter) works properly[1]
 2. That pressing the keypad actually moves the mouse

[1] https://gitlab.gnome.org/GNOME/mutter/-/issues/3708

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4374>

src/tests/a11y-mouse-keys-test.c

@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2025 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 <libevdev/libevdev-uinput.h>
+#include <linux/input-event-codes.h>
+
+#include "backends/meta-backend-private.h"
+#include "meta-test/meta-context-test.h"
+#include "tests/meta-input-test-utils.h"
+#include "tests/meta-test-utils.h"
+
+static MetaContext *test_context;
+
+static void
+run_mouse_keys_tests (MetaContext *context)
+{
+  MetaBackend *backend = meta_context_get_backend (test_context);
+  ClutterSeat *seat = meta_backend_get_default_seat (backend);
+  g_autoptr (ClutterVirtualInputDevice) virtual_keyboard = NULL;
+  ClutterInputDevice *core_pointer;
+  graphene_point_t initial_coords;
+  graphene_point_t moved_coords;
+
+  virtual_keyboard = clutter_seat_create_virtual_device (seat,
+                                                         CLUTTER_KEYBOARD_DEVICE);
+
+  core_pointer = clutter_seat_get_pointer (seat);
+  g_assert_true (clutter_seat_query_state (seat, core_pointer,
+                                           NULL, &initial_coords, NULL));
+  clutter_virtual_input_device_notify_key (virtual_keyboard,
+                                           g_get_monotonic_time (),
+                                           KEY_KP6,
+                                           CLUTTER_KEY_STATE_PRESSED);
+  clutter_virtual_input_device_notify_key (virtual_keyboard,
+                                           g_get_monotonic_time (),
+                                           KEY_KP6,
+                                           CLUTTER_KEY_STATE_RELEASED);
+  meta_flush_input (test_context);
+  meta_wait_for_update (test_context);
+
+  g_assert_true (clutter_seat_query_state (seat, core_pointer,
+                                           NULL, &moved_coords, NULL));
+
+  g_assert_cmpfloat (initial_coords.x, !=, moved_coords.x);
+  g_assert_cmpfloat (initial_coords.y, ==, moved_coords.y);
+
+  meta_context_terminate (test_context);
+}
+
+static void
+meta_test_a11y_mouse_keys (void)
+{
+  g_autoptr (GSettings) a11y_keyboard_settings = NULL;
+  g_autoptr (GError) error = NULL;
+  struct libevdev_uinput *keyboard_device;
+
+  a11y_keyboard_settings = g_settings_new ("org.gnome.desktop.a11y.keyboard");
+  g_settings_set_boolean (a11y_keyboard_settings, "mousekeys-enable", TRUE);
+
+  keyboard_device = meta_create_test_keyboard ();
+  meta_wait_for_uinput_device (keyboard_device);
+
+  g_assert_true (meta_context_setup (test_context, &error));
+  g_assert_true (meta_context_start (test_context, &error));
+
+  meta_context_notify_ready (test_context);
+  g_idle_add_once ((GSourceOnceFunc) run_mouse_keys_tests, test_context);
+  g_assert_true (meta_context_run_main_loop (test_context, &error));
+
+  libevdev_uinput_destroy (keyboard_device);
+}
+
+int
+main (int    argc,
+      char **argv)
+{
+  g_autoptr (MetaContext) context = NULL;
+  g_autoptr (GError) error = NULL;
+
+  context = meta_create_test_context (META_CONTEXT_TEST_TYPE_VKMS,
+                                      META_CONTEXT_TEST_FLAG_NO_X11);
+  g_assert_true (meta_context_configure (context, &argc, &argv, &error));
+
+  test_context = context;
+
+  g_test_add_func ("/a11y/mouse-keys", meta_test_a11y_mouse_keys);
+  return g_test_run ();
+}

src/tests/meson.build

@@ -712,6 +712,18 @@ kms_test_cases = [
 
 privileged_test_cases += kms_test_cases
 
+if libevdev_dep.found()
+  privileged_test_cases += [
+    {
+      'name': 'a11y-mouse-keys-test',
+      'suite': 'a11y',
+      'sources': [
+        'a11y-mouse-keys-test.c',
+      ],
+    },
+  ]
+endif
+
 # Wayland tests
 wayland_test_cases = [
   {