5 files changed, 97 insertions, 2 deletions
diff --git a/app/CMakeLists.txt b/app/CMakeLists.txt
index 88dea68..824e107 100644
--- a/app/CMakeLists.txt
+++ b/app/CMakeLists.txt
@@ -2,6 +2,7 @@
 
 add_library("app"
   "src/application.cpp"
+  "src/windows/main.cpp"
 )
 
 add_library("turns::app" ALIAS "app")
@@ -11,6 +12,9 @@ target_compile_options("app" PUBLIC
   "$<$<CXX_COMPILER_ID:GNU,Clang>:-Wextra>"
   "$<$<CXX_COMPILER_ID:GNU,Clang>:-Werror>"
   "$<$<CXX_COMPILER_ID:GNU,Clang>:-pedantic-errors>"
+  PRIVATE
+  "$<$<AND:$<CXX_COMPILER_ID:GNU,Clang>,$<CONFIG:Debug>>:-fprofile-arcs>"
+  "$<$<AND:$<CXX_COMPILER_ID:GNU,Clang>,$<CONFIG:Debug>>:-ftest-coverage>"
 )
 
 target_include_directories("app" PUBLIC
@@ -18,6 +22,8 @@ target_include_directories("app" PUBLIC
 )
 
 target_link_libraries("app" PUBLIC
+  "$<$<AND:$<CXX_COMPILER_ID:GNU,Clang>,$<CONFIG:Debug>>:gcov>"
+
   "PkgConfig::adwaita"
   "PkgConfig::gtkmm"
 
@@ -51,4 +57,18 @@ configure_file("desktop.in"
 install(FILES
   "${CMAKE_CURRENT_BINARY_DIR}/turns.desktop"
   DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/applications"
-)
-\ No newline at end of file
+)
+
+# Tests
+
+add_executable("app-tests"
+  "tests/windows/main.cpp"
+)
+
+target_link_libraries("app-tests" PRIVATE
+  "Catch2::Catch2"
+  "turns::app"
+  "turns::gtk-test-main"
+)
+
+catch_discover_tests("app-tests")
+\ No newline at end of file
diff --git a/app/include/turns/app/windows/main.hpp b/app/include/turns/app/windows/main.hpp
new file mode 100644
index 0000000..9d2e1c3
--- /dev/null
+++ b/app/include/turns/app/windows/main.hpp
@@ -0,0 +1,23 @@
+#ifndef TURNS_APP_WINDOWS_MAIN_WINDOW_HPP
+#define TURNS_APP_WINDOWS_MAIN_WINDOW_HPP
+
+#include <adwaita.h>
+#include <glibmm/refptr.h>
+#include <gtkmm/applicationwindow.h>
+#include <gtkmm/builder.h>
+
+namespace turns::app::windows
+{
+
+  struct main : Gtk::ApplicationWindow
+  {
+    main(BaseObjectType * base, Glib::RefPtr<Gtk::Builder> const builder);
+
+  private:
+    AdwApplicationWindow * m_adw;
+    AdwWindowTitle * m_title;
+  };
+
+}  // namespace turns::app
+
+#endif
+\ No newline at end of file
diff --git a/app/src/application.cpp b/app/src/application.cpp
index 014171e..660782e 100644
--- a/app/src/application.cpp
+++ b/app/src/application.cpp
@@ -1,5 +1,7 @@
 #include "turns/app/application.hpp"
 
+#include "turns/app/windows/main.hpp"
+
 #include <glibmm.h>
 #include <gtkmm/builder.h>
 #include <gtkmm/window.h>
@@ -18,7 +20,7 @@ namespace turns::app
       : Gtk::Application{"ch.arknet.Turns"}
   {
     auto builder = Gtk::Builder::create_from_resource("/turns/windows/main_window.ui");
-    auto main_window = builder->get_widget<Gtk::ApplicationWindow>("main_window");
+    auto main_window = Gtk::Builder::get_widget_derived<windows::main>(builder, "main_window");
 
     m_main_window = ADW_APPLICATION_WINDOW(main_window->gobj());
 
diff --git a/app/src/windows/main.cpp b/app/src/windows/main.cpp
new file mode 100644
index 0000000..f8437a6
--- /dev/null
+++ b/app/src/windows/main.cpp
@@ -0,0 +1,16 @@
+#include "turns/app/windows/main.hpp"
+
+#include <adwaita.h>
+
+namespace turns::app::windows
+{
+
+  main::main(BaseObjectType * base, Glib::RefPtr<Gtk::Builder> const builder)
+      : Gtk::ApplicationWindow{base}
+      , m_adw{ADW_APPLICATION_WINDOW(gobj())}
+      , m_title(ADW_WINDOW_TITLE(builder->get_widget<Gtk::Widget>("title")->gobj()))
+  {
+    adw_window_title_set_subtitle(m_title, "No active turn-order");
+  }
+
+}  // namespace turns::app::windows
+\ No newline at end of file
diff --git a/app/tests/windows/main.cpp b/app/tests/windows/main.cpp
new file mode 100644
index 0000000..d2ad60e
--- /dev/null
+++ b/app/tests/windows/main.cpp
@@ -0,0 +1,34 @@
+#include "turns/app/windows/main.hpp"
+
+#include <catch2/catch_test_macros.hpp>
+
+#include <string>
+
+#include <adwaita.h>
+#include <gtkmm/builder.h>
+#include <gtkmm/widget.h>
+
+using namespace std::string_literals;
+
+namespace turns::app::windows::tests
+{
+
+  TEST_CASE("Newly constructed main window", "[windows]")
+  {
+    auto builder = Gtk::Builder::create_from_resource("/turns/windows/main_window.ui");
+    auto instance = Gtk::Builder::get_widget_derived<main>(builder, "main_window");
+
+    SECTION("construction via builder succeeds")
+    {
+      REQUIRE(instance);
+    }
+
+    SECTION("the window title is not empty")
+    {
+      auto widget = builder->get_widget<Gtk::Widget>("title");
+      auto adw = ADW_WINDOW_TITLE(widget->gobj());
+      REQUIRE(adw_window_title_get_subtitle(adw) != ""s);
+    }
+  }
+
+}  // namespace turns::app::windows::tests
+\ No newline at end of file