diff --git a/tests/UI_can.cpp b/tests/UI_can.cpp
new file mode 100644
index 0000000..2288ba1
--- /dev/null
+++ b/tests/UI_can.cpp
@@ -0,0 +1,58 @@
+#include "Test.hpp"
+#include <gtest/gtest.h>
+
+TEST(UI_can, add_clear_message)
+{
+    UI_can can(Color::Default, Color::Default);
+    QByteArray array;
+    array.fill((char)0xAA, 8);
+    can.add_received_message(QCanBusFrame(123, array));
+    array.fill((char)0xBB, 8);
+    can.add_send_message(QCanBusFrame(456, array));
+    json j = can.to_json(0);
+    EXPECT_EQ(j.dump(),
+              "{\"bg_color\":\"#FF839192\",\"enabled\":true,\"fg_color\":\"#FF839192\",\"id\":0,\"rcvd_msgs\":[{"
+              "\"dlc\":8,\"id\":123,\"payload\":[170,170,170,170,170,170,170,170]}],\"send_msgs\":[{\"dlc\":8,\"id\":"
+              "456,\"payload\":[187,187,187,187,187,187,187,187]}],\"type\":\"ui_can\",\"visible\":true}");
+
+    can.clear_send_buffer();
+    j = can.to_json(0);
+    EXPECT_EQ(j.dump(), "{\"bg_color\":\"#FF839192\",\"enabled\":true,\"fg_color\":\"#FF839192\",\"id\":0,\"rcvd_"
+                        "msgs\":[{\"dlc\":8,\"id\":123,\"payload\":[170,170,170,170,170,170,170,170]}],\"send_msgs\":[]"
+                        ",\"type\":\"ui_can\",\"visible\":true}");
+
+    can.clear_receive_buffer();
+    j = can.to_json(0);
+    EXPECT_EQ(j.dump(), "{\"bg_color\":\"#FF839192\",\"enabled\":true,\"fg_color\":\"#FF839192\",\"id\":0,\"rcvd_"
+                        "msgs\":[],\"send_msgs\":[],\"type\":\"ui_can\",\"visible\":true}");
+
+    array.fill((char)0xAA, 8);
+    can.add_received_message(QCanBusFrame(123, array));
+    array.fill((char)0xBB, 8);
+    can.add_send_message(QCanBusFrame(456, array));
+    j = can.to_json(0);
+    EXPECT_EQ(j.dump(),
+              "{\"bg_color\":\"#FF839192\",\"enabled\":true,\"fg_color\":\"#FF839192\",\"id\":0,\"rcvd_msgs\":[{"
+              "\"dlc\":8,\"id\":123,\"payload\":[170,170,170,170,170,170,170,170]}],\"send_msgs\":[{\"dlc\":8,\"id\":"
+              "456,\"payload\":[187,187,187,187,187,187,187,187]}],\"type\":\"ui_can\",\"visible\":true}");
+
+    can.clear();
+    j = can.to_json(0);
+    EXPECT_EQ(j.dump(), "{\"bg_color\":\"#FF839192\",\"enabled\":true,\"fg_color\":\"#FF839192\",\"id\":0,\"rcvd_"
+                        "msgs\":[],\"send_msgs\":[],\"type\":\"ui_can\",\"visible\":true}");
+}
+
+TEST(UI_can, signal)
+{
+    UI_can can(Color::Default, Color::Default);
+    QSignalSpy spy_ui(&can, &UI_can::ui_changed);
+    QSignalSpy spy_send(&can, &UI_can::send);
+    QByteArray array;
+    array.fill((char)0xAA, 8);
+    can.add_received_message(QCanBusFrame(123, array));
+    array.fill((char)0xBB, 8);
+    can.add_send_message(QCanBusFrame(456, array));
+    can.can_send(123, 3, {0xAA, 0xBB, 0xAA});
+    EXPECT_EQ(spy_ui.count(), 2);
+    EXPECT_EQ(spy_send.count(), 1);
+}
diff --git a/tests/UI_stacked_widget.cpp b/tests/UI_stacked_widget.cpp
new file mode 100644
index 0000000..66c225e
--- /dev/null
+++ b/tests/UI_stacked_widget.cpp
@@ -0,0 +1,36 @@
+#include "Test.hpp"
+
+TEST(UI_stacked_widget, to_from_json)
+{
+    UI_stacked_widget stacked_widget(3, 0);
+    json j = stacked_widget.to_json(0);
+    UI_stacked_widget stacked_widget2;
+    stacked_widget2.from_json(j);
+    EXPECT_EQ(stacked_widget.selected(), stacked_widget2.selected());
+}
+
+TEST(UI_stacked_widget, set_selected)
+{
+    UI_stacked_widget stacked_widget(3, 0);
+    QSignalSpy spy_ui(&stacked_widget, &UI_stacked_widget::ui_changed);
+    EXPECT_EQ(stacked_widget.selected(), 0);
+    stacked_widget.set_selected(1);
+    EXPECT_EQ(stacked_widget.selected(), 1);
+    stacked_widget.set_selected(3);
+    EXPECT_EQ(stacked_widget.selected(), 1);
+    EXPECT_EQ(spy_ui.count(), 1);
+}
+
+TEST(UI_stacked_widget, advance_tab)
+{
+    UI_stacked_widget stacked_widget(3, 0);
+    QSignalSpy spy_ui(&stacked_widget, &UI_stacked_widget::ui_changed);
+    EXPECT_EQ(stacked_widget.selected(), 0);
+    stacked_widget.advance_tab();
+    EXPECT_EQ(stacked_widget.selected(), 1);
+    stacked_widget.advance_tab();
+    EXPECT_EQ(stacked_widget.selected(), 2);
+    stacked_widget.advance_tab();
+    EXPECT_EQ(stacked_widget.selected(), 0);
+    EXPECT_EQ(spy_ui.count(), 3);
+}
diff --git a/tests/UI_status_bar.cpp b/tests/UI_status_bar.cpp
new file mode 100644
index 0000000..0bed2db
--- /dev/null
+++ b/tests/UI_status_bar.cpp
@@ -0,0 +1,22 @@
+#include "Test.hpp"
+
+TEST(UI_status_bar, to_from_json)
+{
+    UI_status_bar statusbar("message");
+    json j = statusbar.to_json(0);
+    UI_status_bar statusbar2;
+    statusbar2.from_json(j);
+    EXPECT_EQ(statusbar.text(), statusbar2.text());
+}
+
+TEST(UI_status_bar, show_message)
+{
+    UI_status_bar statusbar("message");
+    QSignalSpy spy_ui(&statusbar, &UI_status_bar::ui_changed);
+    EXPECT_EQ(statusbar.text(), "message");
+    EXPECT_EQ(statusbar.timeout(), 0);
+    statusbar.show_message("random text", 3);
+    EXPECT_EQ(statusbar.text(), "random text");
+    EXPECT_EQ(statusbar.timeout(), 3);
+    EXPECT_EQ(spy_ui.count(), 1);
+}
diff --git a/tests/UI_tab_widget.cpp b/tests/UI_tab_widget.cpp
new file mode 100644
index 0000000..69ea6f9
--- /dev/null
+++ b/tests/UI_tab_widget.cpp
@@ -0,0 +1,70 @@
+#include "Test.hpp"
+
+TEST(UI_tab_widget, to_from_json)
+{
+    UI_tab_widget stacked_widget({"Tab 0", "Tab 1", "Tab 2"}, 0);
+    json j = stacked_widget.to_json(0);
+    UI_tab_widget stacked_widget2;
+    stacked_widget2.from_json(j);
+    EXPECT_EQ(stacked_widget.selected(), stacked_widget2.selected());
+}
+
+TEST(UI_tab_widget, set_selected)
+{
+    UI_tab_widget stacked_widget({"Tab 0", "Tab 1", "Tab 2"}, 0);
+    QSignalSpy spy_ui(&stacked_widget, &UI_tab_widget::ui_changed);
+    EXPECT_EQ(stacked_widget.selected(), 0);
+    stacked_widget.set_selected(1);
+    EXPECT_EQ(stacked_widget.selected(), 1);
+    stacked_widget.set_selected(3);
+    EXPECT_EQ(stacked_widget.selected(), 1);
+    EXPECT_EQ(spy_ui.count(), 1);
+}
+
+TEST(UI_tab_widget, advance_tab)
+{
+    UI_tab_widget stacked_widget({"Tab 0", "Tab 1", "Tab 2"}, 0);
+    QSignalSpy spy_ui(&stacked_widget, &UI_tab_widget::ui_changed);
+    EXPECT_EQ(stacked_widget.selected(), 0);
+    stacked_widget.advance_tab();
+    EXPECT_EQ(stacked_widget.selected(), 1);
+    stacked_widget.advance_tab();
+    EXPECT_EQ(stacked_widget.selected(), 2);
+    stacked_widget.advance_tab();
+    EXPECT_EQ(stacked_widget.selected(), 0);
+    EXPECT_EQ(spy_ui.count(), 3);
+}
+
+TEST(UI_tab_widget, set_tab_name)
+{
+    UI_tab_widget stacked_widget({"Tab 0", "Tab 1", "Tab 2"}, 0);
+    QSignalSpy spy_ui(&stacked_widget, &UI_tab_widget::ui_changed);
+    EXPECT_EQ(stacked_widget.tab_name(1), "Tab 1");
+    stacked_widget.set_tab_name(1, "New Tab 1");
+    EXPECT_EQ(stacked_widget.tab_name(1), "New Tab 1");
+    stacked_widget.set_tab_name(3, "Invalid Tab");
+    EXPECT_EQ(stacked_widget.tab_name(3), "");
+    EXPECT_EQ(spy_ui.count(), 1);
+}
+
+TEST(UI_tab_widget, set_visible)
+{
+    UI_tab_widget stacked_widget({"Tab 0", "Tab 1", "Tab 2"}, 0);
+    QSignalSpy spy_ui(&stacked_widget, &UI_tab_widget::ui_changed);
+    EXPECT_EQ(stacked_widget.visible(1), true);
+    stacked_widget.set_visible(1, false);
+    EXPECT_EQ(stacked_widget.visible(1), false);
+    stacked_widget.set_visible(3, true);
+    EXPECT_EQ(stacked_widget.visible(3), false);
+    EXPECT_EQ(spy_ui.count(), 1);
+}
+
+TEST(UI_tab_widget, signal)
+{
+    UI_tab_widget stacked_widget({"Tab 0", "Tab 1", "Tab 2"}, 0);
+    QSignalSpy spy_ui(&stacked_widget, &UI_tab_widget::ui_changed);
+    QSignalSpy spy_changed(&stacked_widget, &UI_tab_widget::changed);
+    stacked_widget.set_selected(1);
+    EXPECT_EQ(spy_ui.count(), 1);
+    EXPECT_EQ(spy_changed.count(), 1);
+}