diff --git a/tests/core.test.ts b/tests/core.test.ts
index b927f58..94d7c01 100644
--- a/tests/core.test.ts
+++ b/tests/core.test.ts
@@ -4,6 +4,7 @@ import { EventGpz } from "../src/interface";
 
 const coreJoyMock = (o: any) => core['Joy'](o)
 const coreBtnMock = (o: any) => core['Btn'](o)
+const coreBtn4Mock = (o: any) => core['Btn4'](o)
 
 test("core joy: 1100 -> 000 (touch)", () => {
   const gpz = {
@@ -34,3 +35,17 @@ test("core gpz: click on button (touch)", () => {
     expect(gpz.stateOld).toEqual([false])
     expect(gpz.stateNew).toEqual([true])
 })
+
+test("core btn4: gamepad input updates state", () => {
+  const gpz = {
+    from: EventGpz.Gamepad,
+    buttons: [true, false, true],
+    stateOld: [false, false, false],
+    stateNew: [false, false, false],
+  };
+
+  coreBtn4Mock(gpz)
+
+  expect(gpz.stateOld).toEqual([false, false, false])
+  expect(gpz.stateNew).toEqual([true, false, true])
+})
diff --git a/tests/draw.test.ts b/tests/draw.test.ts
index 2a87499..4441301 100644
--- a/tests/draw.test.ts
+++ b/tests/draw.test.ts
@@ -4,6 +4,7 @@ import { draw, drawCircle } from "../src/draw"
 const drawJoyMock = (o: any) => draw['Joy'](o)
 const drawBtnMock = (o: any) => draw['Btn'](o)
 const drawDpadMock = (o: any) => draw['Dpad'](o)
+const drawBtn4Mock = (o: any) => draw['Btn4'](o)
 const drawCircleMock = (a: any, b: any, c: any, d: any, e: any) => drawCircle(a, b, e, {x: c, y: d})
 
 test("drawCircle should draw a filled circle with the correct attributes", () => {
@@ -106,3 +107,23 @@ test("Dpad should draw correctly based on stateNew", () => {
 
     expect(gpz.ctx2d.clearRect).toHaveBeenCalledWith(0, 0, 100, 100)
 })
+
+test("Btn4 should draw correctly based on stateNew", () => {
+    const gpz = {
+        canvas: { width: 100, height: 100, dataset: { gpzSize: '16', color: '#aaaaaa80' } },
+        stateNew: [false, false, true, false],
+        ctx2d: {
+            fillStyle: "",
+            beginPath: jest.fn(),
+            arc: jest.fn(),
+            fill: jest.fn(),
+            stroke: jest.fn(),
+            closePath: jest.fn(),
+            clearRect: jest.fn()
+        },
+    }
+
+    drawBtn4Mock(gpz)
+
+    expect(gpz.ctx2d.clearRect).toHaveBeenCalledWith(0, 0, 100, 100)
+})
diff --git a/tests/handlers.test.ts b/tests/handlers.test.ts
index 17ca087..25d24ea 100644
--- a/tests/handlers.test.ts
+++ b/tests/handlers.test.ts
@@ -34,6 +34,8 @@ test('handleGamepadAxis should return an array of Vector2d', () => {
 test('handleGamepadButtons should return an array of pressed button indices', () => {
   const gamepad = {buttons: [{ pressed: false }, { pressed: false }, { pressed: true }]}
   const result = handleGamepadButtonsMock(gamepad)
-  expect(result).toHaveLength(1)
-  expect(result[0]).toBe(2)
+  expect(result).toHaveLength(3)
+  expect(result[0]).toBe(false)
+  expect(result[1]).toBe(false)
+  expect(result[2]).toBe(true)
 })