Add test case for our restricted app manager

tests/anbox/CMakeLists.txt

 add_subdirectory(android)
+add_subdirectory(application)
 add_subdirectory(support)
 add_subdirectory(common)
 add_subdirectory(graphics)

tests/anbox/application/CMakeLists.txt

+ANBOX_ADD_TEST(restricted_manager_tests restricted_manager_tests.cpp)

tests/anbox/application/restricted_manager_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 "anbox/application/manager.h"
+
+#include <gmock/gmock.h>
+
+using namespace ::testing;
+
+namespace {
+class MockManager : public anbox::application::Manager {
+ public:
+  MOCK_METHOD3(launch, void(const anbox::android::Intent&,
+                            const anbox::graphics::Rect&,
+                            const anbox::wm::Stack::Id&));
+  MOCK_METHOD0(ready, core::Property<bool>&());
+};
+}
+
+TEST(RestrictedManager, RedirectsLaunchesToRightStack) {
+  auto mgr = std::make_shared<MockManager>();
+  anbox::application::RestrictedManager restricted_mgr(mgr, anbox::wm::Stack::Id::Freeform);
+
+  EXPECT_CALL(*mgr, launch(_, _, anbox::wm::Stack::Id::Freeform))
+      .Times(4);
+
+  restricted_mgr.launch(anbox::android::Intent{},
+                        anbox::graphics::Rect::Empty,
+                        anbox::wm::Stack::Id::Default);
+
+  restricted_mgr.launch(anbox::android::Intent{},
+                        anbox::graphics::Rect::Empty,
+                        anbox::wm::Stack::Id::Fullscreen);
+
+  restricted_mgr.launch(anbox::android::Intent{},
+                        anbox::graphics::Rect::Empty,
+                        anbox::wm::Stack::Id::Invalid);
+
+  restricted_mgr.launch(anbox::android::Intent{},
+                        anbox::graphics::Rect::Empty,
+                        anbox::wm::Stack::Id::Freeform);
+}