--- a/src/state.rs
+++ b/src/state.rs
@@ -109,3 +109,48 @@ impl State {
         Ok(())
     }
 }
+
+pub struct FakeState {
+    width: f64,
+    height: f64,
+    selected_tool: Key,
+    pressed: bool,
+}
+
+impl FakeState {
+    pub fn new() -> FakeState {
+        FakeState {
+            width: DEFAULT_WIDTH as f64,
+            height: DEFAULT_HEIGHT as f64,
+            selected_tool: Key::ButtonToolPen,
+            pressed: false,
+        }
+    }
+
+    pub fn is_pressed(&self) -> bool {
+        self.pressed
+    }
+
+    pub fn set_size(&mut self, width: i32, height: i32) {
+        self.width = width as f64;
+        self.height = height as f64;
+    }
+
+    pub fn select_tool(&mut self, tool: Key) {
+        self.selected_tool = tool;
+    }
+
+    pub fn press(&mut self, _x: f64, _y: f64) -> std::io::Result<()> {
+        self.pressed = true;
+        Ok(())
+    }
+
+    pub fn release(&mut self, _x: f64, _y: f64) -> std::io::Result<()> {
+        self.pressed = false;
+        Ok(())
+    }
+
+    pub fn motion(&mut self, _x: f64, _y: f64) -> std::io::Result<()> {
+        Ok(())
+    }
+}