tests: add case for render control API to guarantee correct width/height

tests/anbox/graphics/CMakeLists.txt

 ANBOX_ADD_TEST(buffer_queue_tests buffer_queue_tests.cpp)
 ANBOX_ADD_TEST(buffered_io_stream_tests buffered_io_stream_tests.cpp)
 ANBOX_ADD_TEST(layer_composer_tests layer_composer_tests.cpp)
+ANBOX_ADD_TEST(render_control_tests render_control_tests.cpp)

tests/anbox/graphics/render_control_tests.cpp

+/*
+ * Copyright (C) 2017 Simon Fels <morphis@gravedo.de>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3, as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranties of
+ * MERCHANTABILITY, SATISFACTORY QUALITY, 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 <gtest/gtest.h>
+
+#include "anbox/graphics/emugl/DisplayManager.h"
+
+extern int rcGetDisplayWidth(uint32_t display_id);
+extern int rcGetDisplayHeight(uint32_t display_id);
+
+TEST(RenderControl, WidthHeightAreCorrectlyAssigned) {
+  anbox::graphics::emugl::DisplayInfo::get()->set_resolution(640, 480);
+  ASSERT_EQ(rcGetDisplayWidth(0), 640);
+  ASSERT_EQ(rcGetDisplayHeight(0), 480);
+}