diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index db2d2162..bdf02c2a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -111,3 +111,12 @@ jobs:
           make check
           cd $POLYBAR_DIR
           bash <(curl -s https://codecov.io/bash) -F unittests -a "-ap" -Z
+      - name: Upload Logs
+        if: failure()
+        uses: actions/upload-artifact@v2
+        with:
+          name: cmake
+          path: |
+            build/CMakeFiles/CMakeError.log
+            build/CMakeFiles/CMakeOutput.log
+          retention-days: 5
diff --git a/cmake/cxx.cmake b/cmake/cxx.cmake
index 751e1a60..b271e4b8 100644
--- a/cmake/cxx.cmake
+++ b/cmake/cxx.cmake
@@ -22,9 +22,15 @@ set(CMAKE_CXX_EXTENSIONS OFF)
 set(THREADS_PREFER_PTHREAD_FLAG ON)
 
 # Compiler flags
+include(CheckCXXCompilerFlag)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wextra")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wpedantic")
+check_cxx_compiler_flag("-Wsuggest-override" HAS_SUGGEST_OVERRIDE)
+if (HAS_SUGGEST_OVERRIDE)
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wsuggest-override")
+endif()
+unset(HAS_SUGGEST_OVERRIDE)
 
 if (CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
   # Need dprintf() for FreeBSD 11.1 and older
diff --git a/include/components/bar.hpp b/include/components/bar.hpp
index 60416d1d..0c554678 100644
--- a/include/components/bar.hpp
+++ b/include/components/bar.hpp
@@ -86,23 +86,23 @@ class bar : public xpp::event::sink<evt::button_press, evt::expose, evt::propert
   void reconfigure_wm_hints();
   void broadcast_visibility();
 
-  void handle(const evt::client_message& evt);
-  void handle(const evt::destroy_notify& evt);
-  void handle(const evt::enter_notify& evt);
-  void handle(const evt::leave_notify& evt);
-  void handle(const evt::motion_notify& evt);
-  void handle(const evt::button_press& evt);
-  void handle(const evt::expose& evt);
-  void handle(const evt::property_notify& evt);
-  void handle(const evt::configure_notify& evt);
+  void handle(const evt::client_message& evt) override;
+  void handle(const evt::destroy_notify& evt) override;
+  void handle(const evt::enter_notify& evt) override;
+  void handle(const evt::leave_notify& evt) override;
+  void handle(const evt::motion_notify& evt) override;
+  void handle(const evt::button_press& evt) override;
+  void handle(const evt::expose& evt) override;
+  void handle(const evt::property_notify& evt) override;
+  void handle(const evt::configure_notify& evt) override;
 
-  bool on(const signals::eventqueue::start&);
-  bool on(const signals::ui::unshade_window&);
-  bool on(const signals::ui::shade_window&);
-  bool on(const signals::ui::tick&);
-  bool on(const signals::ui::dim_window&);
+  bool on(const signals::eventqueue::start&) override;
+  bool on(const signals::ui::unshade_window&) override;
+  bool on(const signals::ui::shade_window&) override;
+  bool on(const signals::ui::tick&) override;
+  bool on(const signals::ui::dim_window&) override;
 #if WITH_XCURSOR
-  bool on(const signals::ui::cursor_change&);
+  bool on(const signals::ui::cursor_change&) override;
 #endif
 
  private:
diff --git a/include/components/controller.hpp b/include/components/controller.hpp
index a8947e8c..2d5cf28b 100644
--- a/include/components/controller.hpp
+++ b/include/components/controller.hpp
@@ -58,17 +58,17 @@ class controller
   void process_inputdata();
   bool process_update(bool force);
 
-  bool on(const signals::eventqueue::notify_change& evt);
-  bool on(const signals::eventqueue::notify_forcechange& evt);
-  bool on(const signals::eventqueue::exit_terminate& evt);
-  bool on(const signals::eventqueue::exit_reload& evt);
-  bool on(const signals::eventqueue::check_state& evt);
-  bool on(const signals::ui::ready& evt);
-  bool on(const signals::ui::button_press& evt);
-  bool on(const signals::ipc::action& evt);
-  bool on(const signals::ipc::command& evt);
-  bool on(const signals::ipc::hook& evt);
-  bool on(const signals::ui::update_background& evt);
+  bool on(const signals::eventqueue::notify_change& evt) override;
+  bool on(const signals::eventqueue::notify_forcechange& evt) override;
+  bool on(const signals::eventqueue::exit_terminate& evt) override;
+  bool on(const signals::eventqueue::exit_reload& evt) override;
+  bool on(const signals::eventqueue::check_state& evt) override;
+  bool on(const signals::ui::ready& evt) override;
+  bool on(const signals::ui::button_press& evt) override;
+  bool on(const signals::ipc::action& evt) override;
+  bool on(const signals::ipc::command& evt) override;
+  bool on(const signals::ipc::hook& evt) override;
+  bool on(const signals::ui::update_background& evt) override;
 
  private:
   size_t setup_modules(alignment align);
diff --git a/include/components/renderer.hpp b/include/components/renderer.hpp
index 8f494d94..69268d30 100644
--- a/include/components/renderer.hpp
+++ b/include/components/renderer.hpp
@@ -71,22 +71,22 @@ class renderer
   void flush(alignment a);
   void highlight_clickable_areas();
 
-  bool on(const signals::ui::request_snapshot& evt);
-  bool on(const signals::parser::change_background& evt);
-  bool on(const signals::parser::change_foreground& evt);
-  bool on(const signals::parser::change_underline& evt);
-  bool on(const signals::parser::change_overline& evt);
-  bool on(const signals::parser::change_font& evt);
-  bool on(const signals::parser::change_alignment& evt);
-  bool on(const signals::parser::reverse_colors&);
-  bool on(const signals::parser::offset_pixel& evt);
-  bool on(const signals::parser::attribute_set& evt);
-  bool on(const signals::parser::attribute_unset& evt);
-  bool on(const signals::parser::attribute_toggle& evt);
-  bool on(const signals::parser::action_begin& evt);
-  bool on(const signals::parser::action_end& evt);
-  bool on(const signals::parser::text& evt);
-  bool on(const signals::parser::control& evt);
+  bool on(const signals::ui::request_snapshot& evt) override;
+  bool on(const signals::parser::change_background& evt) override;
+  bool on(const signals::parser::change_foreground& evt) override;
+  bool on(const signals::parser::change_underline& evt) override;
+  bool on(const signals::parser::change_overline& evt) override;
+  bool on(const signals::parser::change_font& evt) override;
+  bool on(const signals::parser::change_alignment& evt) override;
+  bool on(const signals::parser::reverse_colors&) override;
+  bool on(const signals::parser::offset_pixel& evt) override;
+  bool on(const signals::parser::attribute_set& evt) override;
+  bool on(const signals::parser::attribute_unset& evt) override;
+  bool on(const signals::parser::attribute_toggle& evt) override;
+  bool on(const signals::parser::action_begin& evt) override;
+  bool on(const signals::parser::action_end& evt) override;
+  bool on(const signals::parser::text& evt) override;
+  bool on(const signals::parser::control& evt) override;
 
  protected:
   struct reserve_area {
diff --git a/include/components/screen.hpp b/include/components/screen.hpp
index bdcf30a2..f004de21 100644
--- a/include/components/screen.hpp
+++ b/include/components/screen.hpp
@@ -33,7 +33,7 @@ class screen : public xpp::event::sink<evt::randr_screen_change_notify> {
   }
 
  protected:
-  void handle(const evt::randr_screen_change_notify& evt);
+  void handle(const evt::randr_screen_change_notify& evt) override;
 
  private:
   connection& m_connection;
@@ -45,7 +45,9 @@ class screen : public xpp::event::sink<evt::randr_screen_change_notify> {
   xcb_window_t m_proxy{XCB_NONE};
 
   vector<monitor_t> m_monitors;
-  struct size m_size {0U, 0U};
+  struct size m_size {
+    0U, 0U
+  };
   bool m_sigraised{false};
 
   bool have_monitors_changed() const;
diff --git a/include/events/signal_receiver.hpp b/include/events/signal_receiver.hpp
index 9f2a8055..71cd6013 100644
--- a/include/events/signal_receiver.hpp
+++ b/include/events/signal_receiver.hpp
@@ -1,9 +1,9 @@
 #pragma once
 
 #include <map>
-#include <unordered_map>
 #include <typeindex>
 #include <typeinfo>
+#include <unordered_map>
 
 #include "common.hpp"
 
@@ -42,7 +42,7 @@ class signal_receiver : public signal_receiver_interface,
                         public signal_receiver_impl<Signal>,
                         public signal_receiver_impl<Signals>... {
  public:
-  prio priority() const {
+  prio priority() const override {
     return Priority;
   }
 };
diff --git a/include/modules/battery.hpp b/include/modules/battery.hpp
index 583a6de1..83c7450f 100644
--- a/include/modules/battery.hpp
+++ b/include/modules/battery.hpp
@@ -48,7 +48,7 @@ namespace modules {
    public:
     explicit battery_module(const bar_settings&, string);
 
-    void start();
+    void start() override;
     void teardown();
     void idle();
     bool on_event(inotify_event* event);
diff --git a/include/modules/bspwm.hpp b/include/modules/bspwm.hpp
index b8f45f32..056d36d9 100644
--- a/include/modules/bspwm.hpp
+++ b/include/modules/bspwm.hpp
@@ -41,7 +41,7 @@ namespace modules {
    public:
     explicit bspwm_module(const bar_settings&, string);
 
-    void stop();
+    void stop() override;
     bool has_event();
     bool update();
     string get_output();
diff --git a/include/modules/i3.hpp b/include/modules/i3.hpp
index bed2c4cf..6775169b 100644
--- a/include/modules/i3.hpp
+++ b/include/modules/i3.hpp
@@ -46,7 +46,7 @@ namespace modules {
    public:
     explicit i3_module(const bar_settings&, string);
 
-    void stop();
+    void stop() override;
     bool has_event();
     bool update();
     bool build(builder* builder, const string& tag) const;
diff --git a/include/modules/ipc.hpp b/include/modules/ipc.hpp
index 63e4fe70..d0097cc1 100644
--- a/include/modules/ipc.hpp
+++ b/include/modules/ipc.hpp
@@ -26,7 +26,7 @@ namespace modules {
    public:
     explicit ipc_module(const bar_settings&, string);
 
-    void start();
+    void start() override;
     void update() {}
     string get_output();
     bool build(builder* builder, const string& tag) const;
diff --git a/include/modules/meta/base.hpp b/include/modules/meta/base.hpp
index 2a6855af..984e1610 100644
--- a/include/modules/meta/base.hpp
+++ b/include/modules/meta/base.hpp
@@ -145,21 +145,21 @@ namespace modules {
     module(const bar_settings bar, string name);
     ~module() noexcept;
 
-    string type() const;
+    string type() const override;
 
-    string name_raw() const;
-    string name() const;
-    bool running() const;
+    string name_raw() const override;
+    string name() const override;
+    bool running() const override;
 
-    bool visible() const;
-    void set_visible(bool value);
+    bool visible() const override;
+    void set_visible(bool value) override;
 
-    void stop();
-    void halt(string error_message);
+    void stop() override;
+    void halt(string error_message) override;
     void teardown();
-    string contents();
+    string contents() override;
 
-    bool input(const string& action, const string& data) final;
+    bool input(const string& action, const string& data) final override;
 
    protected:
     void broadcast();
diff --git a/include/modules/meta/event_module.hpp b/include/modules/meta/event_module.hpp
index 417ca3a4..025fdccd 100644
--- a/include/modules/meta/event_module.hpp
+++ b/include/modules/meta/event_module.hpp
@@ -10,7 +10,7 @@ namespace modules {
    public:
     using module<Impl>::module;
 
-    void start() {
+    void start() override {
       this->m_mainthread = thread(&event_module::runner, this);
     }
 
@@ -40,6 +40,6 @@ namespace modules {
       }
     }
   };
-}
+}  // namespace modules
 
 POLYBAR_NS_END
diff --git a/include/modules/meta/inotify_module.hpp b/include/modules/meta/inotify_module.hpp
index 0b174d3c..2c69e948 100644
--- a/include/modules/meta/inotify_module.hpp
+++ b/include/modules/meta/inotify_module.hpp
@@ -11,7 +11,7 @@ namespace modules {
    public:
     using module<Impl>::module;
 
-    void start() {
+    void start() override {
       this->m_mainthread = thread(&inotify_module::runner, this);
     }
 
@@ -88,6 +88,6 @@ namespace modules {
    private:
     map<string, int> m_watchlist;
   };
-}
+}  // namespace modules
 
 POLYBAR_NS_END
diff --git a/include/modules/meta/static_module.hpp b/include/modules/meta/static_module.hpp
index cc30e8fa..8e53938c 100644
--- a/include/modules/meta/static_module.hpp
+++ b/include/modules/meta/static_module.hpp
@@ -10,7 +10,7 @@ namespace modules {
    public:
     using module<Impl>::module;
 
-    void start() {
+    void start() override {
       this->m_mainthread = thread([&] {
         this->m_log.trace("%s: Thread id = %i", this->name(), concurrency_util::thread_id(this_thread::get_id()));
         CAST_MOD(Impl)->update();
@@ -22,6 +22,6 @@ namespace modules {
       return true;
     }
   };
-}
+}  // namespace modules
 
 POLYBAR_NS_END
diff --git a/include/modules/meta/timer_module.hpp b/include/modules/meta/timer_module.hpp
index 2cd5f3bf..e2ca716a 100644
--- a/include/modules/meta/timer_module.hpp
+++ b/include/modules/meta/timer_module.hpp
@@ -12,7 +12,7 @@ namespace modules {
    public:
     using module<Impl>::module;
 
-    void start() {
+    void start() override {
       this->m_mainthread = thread(&timer_module::runner, this);
     }
 
diff --git a/include/modules/script.hpp b/include/modules/script.hpp
index 2a62d3a0..1ad83222 100644
--- a/include/modules/script.hpp
+++ b/include/modules/script.hpp
@@ -12,8 +12,8 @@ namespace modules {
     explicit script_module(const bar_settings&, string);
     ~script_module() {}
 
-    void start();
-    void stop();
+    void start() override;
+    void stop() override;
 
     string get_output();
     bool build(builder* builder, const string& tag) const;
diff --git a/include/modules/unsupported.hpp b/include/modules/unsupported.hpp
index 28e53155..c54b57a4 100644
--- a/include/modules/unsupported.hpp
+++ b/include/modules/unsupported.hpp
@@ -15,29 +15,29 @@ namespace modules {
       throw application_error("No built-in support for '" + string{MODULE_TYPE} + "'"); \
     }                                                                                   \
     static constexpr auto TYPE = MODULE_TYPE;                                           \
-    string type() const {                                                               \
+    string type() const override {                                                      \
       return "";                                                                        \
     }                                                                                   \
-    string name_raw() const {                                                           \
+    string name_raw() const override {                                                  \
       return "";                                                                        \
     }                                                                                   \
-    string name() const {                                                               \
+    string name() const override {                                                      \
       return "";                                                                        \
     }                                                                                   \
-    bool running() const {                                                              \
+    bool running() const override {                                                     \
       return false;                                                                     \
     }                                                                                   \
-    bool visible() const {                                                              \
+    bool visible() const override {                                                     \
       return false;                                                                     \
     }                                                                                   \
-    void set_visible(bool) {}                                                           \
-    void start() {}                                                                     \
-    void stop() {}                                                                      \
-    void halt(string) {}                                                                \
-    string contents() {                                                                 \
+    void set_visible(bool) override {}                                                  \
+    void start() override {}                                                            \
+    void stop() override {}                                                             \
+    void halt(string) override {}                                                       \
+    string contents() override {                                                        \
       return "";                                                                        \
     }                                                                                   \
-    bool input(const string&, const string&) {                                          \
+    bool input(const string&, const string&) override {                                 \
       return false;                                                                     \
     }                                                                                   \
   }
diff --git a/include/modules/xbacklight.hpp b/include/modules/xbacklight.hpp
index 99cf63b9..269b4244 100644
--- a/include/modules/xbacklight.hpp
+++ b/include/modules/xbacklight.hpp
@@ -36,7 +36,7 @@ namespace modules {
     static constexpr const char* EVENT_DEC = "dec";
 
    protected:
-    void handle(const evt::randr_notify& evt);
+    void handle(const evt::randr_notify& evt) override;
 
     void action_inc();
     void action_dec();
diff --git a/include/modules/xkeyboard.hpp b/include/modules/xkeyboard.hpp
index 44892d77..d8d11926 100644
--- a/include/modules/xkeyboard.hpp
+++ b/include/modules/xkeyboard.hpp
@@ -34,9 +34,9 @@ namespace modules {
     bool query_keyboard();
     bool blacklisted(const string& indicator_name);
 
-    void handle(const evt::xkb_new_keyboard_notify& evt);
-    void handle(const evt::xkb_state_notify& evt);
-    void handle(const evt::xkb_indicator_state_notify& evt);
+    void handle(const evt::xkb_new_keyboard_notify& evt) override;
+    void handle(const evt::xkb_state_notify& evt) override;
+    void handle(const evt::xkb_indicator_state_notify& evt) override;
 
     void action_switch();
 
diff --git a/include/modules/xwindow.hpp b/include/modules/xwindow.hpp
index 506504ed..80c45e44 100644
--- a/include/modules/xwindow.hpp
+++ b/include/modules/xwindow.hpp
@@ -39,7 +39,7 @@ namespace modules {
     static constexpr auto TYPE = "internal/xwindow";
 
    protected:
-    void handle(const evt::property_notify& evt);
+    void handle(const evt::property_notify& evt) override;
 
    private:
     static constexpr const char* TAG_LABEL{"<label>"};
diff --git a/include/modules/xworkspaces.hpp b/include/modules/xworkspaces.hpp
index 979f2378..4664e3d0 100644
--- a/include/modules/xworkspaces.hpp
+++ b/include/modules/xworkspaces.hpp
@@ -65,7 +65,7 @@ namespace modules {
     static constexpr auto EVENT_PREV = "prev";
 
    protected:
-    void handle(const evt::property_notify& evt);
+    void handle(const evt::property_notify& evt) override;
 
     void rebuild_clientlist();
     void rebuild_urgent_hints();
diff --git a/include/tags/parser.hpp b/include/tags/parser.hpp
index 8c4488f4..e2d5229d 100644
--- a/include/tags/parser.hpp
+++ b/include/tags/parser.hpp
@@ -24,7 +24,7 @@ namespace tags {
       msg.append(" (Context: '" + ctxt + "')");
     }
 
-    virtual const char* what() const noexcept {
+    virtual const char* what() const noexcept override {
       return msg.c_str();
     }
 
diff --git a/include/utils/file.hpp b/include/utils/file.hpp
index ba165959..0e062936 100644
--- a/include/utils/file.hpp
+++ b/include/utils/file.hpp
@@ -67,9 +67,9 @@ class fd_streambuf : public std::streambuf {
   void close();
 
  protected:
-  int sync();
-  int overflow(int c);
-  int underflow();
+  int sync() override;
+  int overflow(int c) override;
+  int underflow() override;
 
  private:
   file_descriptor m_fd;
diff --git a/include/x11/background_manager.hpp b/include/x11/background_manager.hpp
index b887d591..e5de8bd8 100644
--- a/include/x11/background_manager.hpp
+++ b/include/x11/background_manager.hpp
@@ -17,7 +17,7 @@ class logger;
 namespace cairo {
   class surface;
   class xcb_surface;
-}
+}  // namespace cairo
 
 class bg_slice {
  public:
@@ -65,8 +65,7 @@ class bg_slice {
  * so this class takes a rectangle that limits what part of the background is stored.
  */
 class background_manager : public signal_receiver<SIGN_PRIORITY_SCREEN, signals::ui::update_geometry>,
-                           public xpp::event::sink<evt::property_notify>
-{
+                           public xpp::event::sink<evt::property_notify> {
  public:
   using make_type = background_manager&;
   static make_type make();
@@ -96,8 +95,9 @@ class background_manager : public signal_receiver<SIGN_PRIORITY_SCREEN, signals:
    */
   std::shared_ptr<bg_slice> observe(xcb_rectangle_t rect, xcb_window_t window);
 
-  void handle(const evt::property_notify& evt);
-  bool on(const signals::ui::update_geometry&);
+  void handle(const evt::property_notify& evt) override;
+  bool on(const signals::ui::update_geometry&) override;
+
  private:
   void activate();
   void deactivate();
@@ -119,7 +119,6 @@ class background_manager : public signal_receiver<SIGN_PRIORITY_SCREEN, signals:
   void allocate_resources();
   void free_resources();
   void fetch_root_pixmap();
-
 };
 
 POLYBAR_NS_END
diff --git a/include/x11/connection.hpp b/include/x11/connection.hpp
index 8931ac83..e28f2127 100644
--- a/include/x11/connection.hpp
+++ b/include/x11/connection.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <xcb/xcb.h>
+
 #include <cstdlib>
 #include <xpp/core.hpp>
 #include <xpp/generic/factory.hpp>
@@ -44,7 +45,7 @@ namespace detail {
 
     virtual ~connection_base() {}
 
-    void operator()(const shared_ptr<xcb_generic_error_t>& error) const {
+    void operator()(const shared_ptr<xcb_generic_error_t>& error) const override {
       check<xpp::x::extension, Extensions...>(error);
     }
 
@@ -59,7 +60,7 @@ namespace detail {
       return make()(*this, m_root_window);
     }
 
-    shared_ptr<xcb_generic_event_t> wait_for_event() const {
+    shared_ptr<xcb_generic_event_t> wait_for_event() const override {
       try {
         return core::wait_for_event();
       } catch (const shared_ptr<xcb_generic_error_t>& error) {
@@ -68,7 +69,7 @@ namespace detail {
       throw;  // re-throw exception
     }
 
-    shared_ptr<xcb_generic_event_t> wait_for_special_event(xcb_special_event_t* se) const {
+    shared_ptr<xcb_generic_event_t> wait_for_special_event(xcb_special_event_t* se) const override {
       try {
         return core::wait_for_special_event(se);
       } catch (const shared_ptr<xcb_generic_error_t>& error) {
@@ -93,7 +94,7 @@ namespace detail {
       dispatcher(error);
     }
   };
-}
+}  // namespace detail
 
 class connection : public detail::connection_base<connection&, XPP_EXTENSION_LIST> {
  public:
diff --git a/include/x11/tray_manager.hpp b/include/x11/tray_manager.hpp
index 1228c3a9..a56dee5f 100644
--- a/include/x11/tray_manager.hpp
+++ b/include/x11/tray_manager.hpp
@@ -120,21 +120,21 @@ class tray_manager : public xpp::event::sink<evt::expose, evt::visibility_notify
   void remove_client(xcb_window_t win, bool reconfigure = true);
   unsigned int mapped_clients() const;
 
-  void handle(const evt::expose& evt);
-  void handle(const evt::visibility_notify& evt);
-  void handle(const evt::client_message& evt);
-  void handle(const evt::configure_request& evt);
-  void handle(const evt::resize_request& evt);
-  void handle(const evt::selection_clear& evt);
-  void handle(const evt::property_notify& evt);
-  void handle(const evt::reparent_notify& evt);
-  void handle(const evt::destroy_notify& evt);
-  void handle(const evt::map_notify& evt);
-  void handle(const evt::unmap_notify& evt);
+  void handle(const evt::expose& evt) override;
+  void handle(const evt::visibility_notify& evt) override;
+  void handle(const evt::client_message& evt) override;
+  void handle(const evt::configure_request& evt) override;
+  void handle(const evt::resize_request& evt) override;
+  void handle(const evt::selection_clear& evt) override;
+  void handle(const evt::property_notify& evt) override;
+  void handle(const evt::reparent_notify& evt) override;
+  void handle(const evt::destroy_notify& evt) override;
+  void handle(const evt::map_notify& evt) override;
+  void handle(const evt::unmap_notify& evt) override;
 
-  bool on(const signals::ui::visibility_change& evt);
-  bool on(const signals::ui::dim_window& evt);
-  bool on(const signals::ui::update_background& evt);
+  bool on(const signals::ui::visibility_change& evt) override;
+  bool on(const signals::ui::dim_window& evt) override;
+  bool on(const signals::ui::update_background& evt) override;
 
  private:
   connection& m_connection;
diff --git a/tests/unit_tests/components/command_line.cpp b/tests/unit_tests/components/command_line.cpp
index 79873a70..5e857943 100644
--- a/tests/unit_tests/components/command_line.cpp
+++ b/tests/unit_tests/components/command_line.cpp
@@ -1,32 +1,32 @@
-#include "common/test.hpp"
 #include "components/command_line.hpp"
+
+#include "common/test.hpp"
 #include "utils/string.hpp"
 
 using namespace polybar;
 
 class CommandLine : public ::testing::Test {
-  protected:
-    virtual void SetUp() {
-      set_cli();
-    }
+ protected:
+  virtual void SetUp() override {
+    set_cli();
+  }
 
-    virtual void set_cli() {
-      cli = command_line::parser::make("cmd", get_opts());
-    }
+  virtual void set_cli() {
+    cli = command_line::parser::make("cmd", get_opts());
+  }
 
-    command_line::options get_opts()  {
-      // clang-format off
+  command_line::options get_opts() {
+    // clang-format off
       return command_line::options {
         command_line::option{"-f", "--flag", "Flag description"},
         command_line::option{"-o", "--option", "Option description", "OPTION", {"foo", "bar", "baz"}},
       };
-      // clang-format on
-    };
+    // clang-format on
+  };
 
-    command_line::parser::make_type cli;
+  command_line::parser::make_type cli;
 };
 
-
 TEST_F(CommandLine, hasShort) {
   cli->process_input(string_util::split("-f", ' '));
   EXPECT_TRUE(cli->has("flag"));