tests: Add basic monitor configuration tests

The added test checks that two monitors are lied out on a row next to
each other.

https://bugzilla.gnome.org/show_bug.cgi?id=777732

src/Makefile-tests.am

@@ -38,6 +38,8 @@ mutter_test_unit_tests_SOURCES = \
 	tests/meta-backend-test.h \
 	tests/meta-monitor-manager-test.c \
 	tests/meta-monitor-manager-test.h \
+	tests/monitor-unit-tests.c \
+	tests/monitor-unit-tests.h \
 	$(NULL)
 mutter_test_unit_tests_LDADD = $(MUTTER_LIBS) libmutter.la
 

src/tests/monitor-unit-tests.c

@@ -0,0 +1,68 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+
+/*
+ * Copyright (C) 2016 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 "tests/monitor-unit-tests.h"
+
+#include "backends/meta-backend-private.h"
+
+static void
+meta_test_monitor_linear_config (void)
+{
+  MetaBackend *backend = meta_get_backend ();
+  MetaMonitorManager *monitor_manager =
+    meta_backend_get_monitor_manager (backend);
+  GList *logical_monitors, *l;
+  int n_logical_monitors, i;
+  MetaRectangle expected_rects[] = {
+    { .x = 0, .y = 0, .width = 1024, .height = 768 },
+    { .x = 1024, .y = 0, .width = 1024, .height = 768 },
+  };
+
+  g_assert (monitor_manager->screen_width == 1024 * 2);
+  g_assert (monitor_manager->screen_height == 768);
+  g_assert (monitor_manager->n_outputs == 2);
+  g_assert (monitor_manager->n_crtcs == 2);
+
+  n_logical_monitors =
+    meta_monitor_manager_get_num_logical_monitors (monitor_manager);
+  g_assert (n_logical_monitors == 2);
+
+  logical_monitors =
+    meta_monitor_manager_get_logical_monitors (monitor_manager);
+  i = 0;
+  for (l = logical_monitors; l; l = l->next)
+    {
+      MetaLogicalMonitor *logical_monitor = l->data;
+
+      g_assert (logical_monitor->rect.x == expected_rects[i].x);
+      g_assert (logical_monitor->rect.y == expected_rects[i].y);
+      g_assert (logical_monitor->rect.width == expected_rects[i].width);
+      g_assert (logical_monitor->rect.height == expected_rects[i].height);
+      i++;
+    }
+}
+
+void
+init_monitor_tests (void)
+{
+  g_test_add_func ("/backends/monitor/linear-config",
+                   meta_test_monitor_linear_config);
+}

src/tests/monitor-unit-tests.h

@@ -0,0 +1,25 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+
+/*
+ * Copyright (C) 2016 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/>.
+ */
+
+#ifndef MONITOR_UNIT_TESTS_H
+#define MONITOR_UNIT_TESTS_H
+
+void init_monitor_tests (void);
+
+#endif /* MONITOR_UNIT_TESTS_H */

src/tests/unit-tests.c

@@ -28,6 +28,7 @@
 #include "compositor/meta-plugin-manager.h"
 #include "core/main-private.h"
 #include "tests/meta-backend-test.h"
+#include "tests/monitor-unit-tests.h"
 
 typedef struct _MetaTestLaterOrderCallbackData
 {
@@ -198,6 +199,8 @@ init_tests (int argc, char **argv)
   g_test_add_func ("/util/meta-later/order", meta_test_util_later_order);
   g_test_add_func ("/util/meta-later/schedule-from-later",
                    meta_test_util_later_schedule_from_later);
+
+  init_monitor_tests ();
 }
 
 int