diff --git a/rider-editor/src/ui/buttons/save_button.rs b/rider-editor/src/ui/buttons/save_button.rs
index 498f0b5..9d9d334 100644
--- a/rider-editor/src/ui/buttons/save_button.rs
+++ b/rider-editor/src/ui/buttons/save_button.rs
@@ -39,7 +39,7 @@ impl Widget for SaveButton {
     }
 
     fn set_dest(&mut self, rect: &Rect) {
-        self.inner.dest = rect.clone();
+        self.dest = rect.clone();
     }
 
     fn source(&self) -> &Rect {
@@ -47,7 +47,7 @@ impl Widget for SaveButton {
     }
 
     fn set_source(&mut self, rect: &Rect) {
-        self.inner.source = rect.clone();
+        self.source = rect.clone();
     }
 
     fn on_left_click(&mut self, _point: &Point, _context: &UpdateContext) -> UR {
@@ -74,3 +74,48 @@ impl SaveButton {
         }
     }
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use crate::app::UpdateResult;
+    use crate::tests::support;
+
+    #[test]
+    fn must_return_save_on_left_click() {
+        let config = support::build_config();
+        let mut widget = SaveButton::new(config);
+        assert_eq!(
+            widget.on_left_click(&Point::new(0, 0), &UpdateContext::Nothing),
+            UpdateResult::SaveCurrentFile
+        );
+    }
+
+    #[test]
+    fn must_use_inner() {
+        let config = support::build_config();
+        let mut widget = SaveButton::new(config);
+
+        assert_eq!(
+            widget.dest(),
+            &Rect::new(0, 0, ICON_DEST_WIDTH, ICON_DEST_HEIGHT)
+        );
+        widget.set_dest(&Rect::new(1, 2, 3, 4));
+        assert_eq!(widget.dest(), &Rect::new(1, 2, 3, 4));
+
+        assert_eq!(
+            widget.source(),
+            &Rect::new(0, 0, ICON_SRC_WIDTH, ICON_SRC_HEIGHT)
+        );
+        widget.set_source(&Rect::new(5, 6, 7, 8));
+        assert_eq!(widget.source(), &Rect::new(5, 6, 7, 8));
+    }
+
+    #[test]
+    fn must_have_padding() {
+        let config = support::build_config();
+        let widget = SaveButton::new(config);
+        assert_eq!(widget.padding_width(), ICON_DEST_WIDTH);
+        assert_eq!(widget.padding_height(), ICON_DEST_HEIGHT);
+    }
+}
diff --git a/rider-editor/src/ui/buttons/settings_button.rs b/rider-editor/src/ui/buttons/settings_button.rs
index 4bd0f47..39c40d6 100644
--- a/rider-editor/src/ui/buttons/settings_button.rs
+++ b/rider-editor/src/ui/buttons/settings_button.rs
@@ -40,7 +40,7 @@ impl Widget for SettingsButton {
     }
 
     fn set_dest(&mut self, rect: &Rect) {
-        self.inner.dest = rect.clone();
+        self.dest = rect.clone();
     }
 
     fn source(&self) -> &Rect {
@@ -48,7 +48,7 @@ impl Widget for SettingsButton {
     }
 
     fn set_source(&mut self, rect: &Rect) {
-        self.inner.source = rect.clone();
+        self.source = rect.clone();
     }
 
     fn on_left_click(&mut self, _point: &Point, _context: &UpdateContext) -> UR {
@@ -75,3 +75,48 @@ impl SettingsButton {
         }
     }
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use crate::app::UpdateResult;
+    use crate::tests::support;
+
+    #[test]
+    fn must_return_open_settings_on_left_click() {
+        let config = support::build_config();
+        let mut widget = SettingsButton::new(config);
+        assert_eq!(
+            widget.on_left_click(&Point::new(0, 0), &UpdateContext::Nothing),
+            UpdateResult::OpenSettings
+        );
+    }
+
+    #[test]
+    fn must_use_inner() {
+        let config = support::build_config();
+        let mut widget = SettingsButton::new(config);
+
+        assert_eq!(
+            widget.dest(),
+            &Rect::new(0, 0, ICON_DEST_WIDTH, ICON_DEST_HEIGHT)
+        );
+        widget.set_dest(&Rect::new(1, 2, 3, 4));
+        assert_eq!(widget.dest(), &Rect::new(1, 2, 3, 4));
+
+        assert_eq!(
+            widget.source(),
+            &Rect::new(0, 0, ICON_SRC_WIDTH, ICON_SRC_HEIGHT)
+        );
+        widget.set_source(&Rect::new(5, 6, 7, 8));
+        assert_eq!(widget.source(), &Rect::new(5, 6, 7, 8));
+    }
+
+    #[test]
+    fn must_have_padding() {
+        let config = support::build_config();
+        let widget = SettingsButton::new(config);
+        assert_eq!(widget.padding_width(), ICON_DEST_WIDTH);
+        assert_eq!(widget.padding_height(), ICON_DEST_HEIGHT);
+    }
+}
diff --git a/rider-editor/src/ui/icon.rs b/rider-editor/src/ui/icon.rs
index 64ee836..96091f9 100644
--- a/rider-editor/src/ui/icon.rs
+++ b/rider-editor/src/ui/icon.rs
@@ -31,12 +31,12 @@ impl Icon {
 
     #[inline]
     pub fn height(&self) -> u32 {
-        self.inner.dest.height()
+        self.dest.height()
     }
 
     #[inline]
     pub fn width(&self) -> u32 {
-        self.inner.dest.width()
+        self.dest.width()
     }
 
     pub fn set_texture_path(&mut self, path: String) {
@@ -50,18 +50,57 @@ impl Widget for Icon {
     }
 
     fn dest(&self) -> &Rect {
-        &self.inner.dest
+        &self.dest
     }
 
     fn set_dest(&mut self, rect: &Rect) {
-        self.inner.dest = rect.clone();
+        self.dest = rect.clone();
     }
 
     fn source(&self) -> &Rect {
-        &self.inner.source
+        &self.source
     }
 
     fn set_source(&mut self, rect: &Rect) {
-        self.inner.source = rect.clone();
+        self.source = rect.clone();
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use crate::app::UpdateResult;
+    use crate::tests::support;
+    use crate::ui::UpdateContext;
+    use sdl2::rect::Point;
+
+    #[test]
+    fn must_return_noop_on_left_click() {
+        let config = support::build_config();
+        let dest = Rect::new(0, 10, 20, 30);
+        let src = Rect::new(40, 50, 60, 70);
+        let path = "/foo/bar.png".to_owned();
+        let mut widget = Icon::new(config, path, src, dest.clone());
+        assert_eq!(
+            widget.on_left_click(&Point::new(0, 0), &UpdateContext::Nothing),
+            UpdateResult::NoOp
+        );
+    }
+
+    #[test]
+    fn must_use_inner() {
+        let config = support::build_config();
+        let dest = Rect::new(0, 10, 20, 30);
+        let src = Rect::new(40, 50, 60, 70);
+        let path = "/foo/bar.png".to_owned();
+        let mut widget = Icon::new(config, path, src, dest.clone());
+
+        assert_eq!(widget.dest(), &dest);
+        widget.set_dest(&Rect::new(1, 2, 3, 4));
+        assert_eq!(widget.dest(), &Rect::new(1, 2, 3, 4));
+
+        assert_eq!(widget.source(), &src);
+        widget.set_source(&Rect::new(5, 6, 7, 8));
+        assert_eq!(widget.source(), &Rect::new(5, 6, 7, 8));
     }
 }
diff --git a/rider-editor/src/ui/label.rs b/rider-editor/src/ui/label.rs
index b30970c..374bb68 100644
--- a/rider-editor/src/ui/label.rs
+++ b/rider-editor/src/ui/label.rs
@@ -142,3 +142,47 @@ impl ConfigHolder for Label {
         &self.config
     }
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use crate::app::UpdateResult;
+    use crate::tests::support;
+    use crate::ui::{UpdateContext, Widget};
+    use sdl2::rect::Point;
+
+    #[test]
+    fn must_return_noop_on_left_click() {
+        let config = support::build_config();
+        let name = "Hello world".to_owned();
+        let mut widget = Label::new(name, config);
+        assert_eq!(
+            widget.on_left_click(&Point::new(0, 0), &UpdateContext::Nothing),
+            UpdateResult::NoOp
+        );
+    }
+
+    #[test]
+    fn must_use_inner() {
+        let config = support::build_config();
+        let mut renderer = support::SimpleRendererMock::new(config.clone());
+        let name = "Hello world".to_owned();
+        let mut widget = Label::new(name.clone(), config);
+        let dest = Rect::new(0, 0, DEST_WIDTH, DEST_HEIGHT);
+        let src = Rect::new(0, 0, SRC_WIDTH, SRC_HEIGHT);
+
+        assert_eq!(widget.dest(), &dest);
+        widget.set_dest(&Rect::new(1, 2, 3, 4));
+        assert_eq!(widget.dest(), &Rect::new(1, 2, 3, 4));
+
+        assert_eq!(widget.source(), &src);
+        widget.set_source(&Rect::new(5, 6, 7, 8));
+        assert_eq!(widget.source(), &Rect::new(5, 6, 7, 8));
+
+        assert_eq!(widget.name_width(), widget.dest().width());
+
+        assert_eq!(widget.name(), name);
+
+        widget.prepare_ui(&mut renderer);
+    }
+}