diff --git a/src/camera.test.tsx b/src/camera.test.tsx
new file mode 100644
index 0000000..72076c8
--- /dev/null
+++ b/src/camera.test.tsx
@@ -0,0 +1,20 @@
+import { mount } from 'enzyme';
+import React from 'react';
+import Camera from './camera';
+
+describe('Camera', () => {
+  it('Turning a Todo item into Done', () => {
+    let imgBase64 = undefined;
+    const handlePhotograph = (base64) => {
+      imgBase64 = base64;
+      console.log(base64)
+    };
+
+    const camera = mount(<Camera onPhotograph={handlePhotograph} />);
+    const button = camera.find('button').at(0);
+
+    button.simulate('click');
+
+    expect(typeof imgBase64 === 'string').toEqual(true);
+  })
+});
diff --git a/src/camera.tsx b/src/camera.tsx
index 702ce4e..73f0a45 100644
--- a/src/camera.tsx
+++ b/src/camera.tsx
@@ -8,7 +8,7 @@ export interface ICameraProps {
   prefixCls?: string;
   style?: React.CSSProperties;
   videoWidth?: number;
-  onPhotograph: (image: string) => void;
+  onPhotograph?: (image: string) => void;
 }
 
 const Camera: React.FC<ICameraProps> = (props) => {