fix unit tests

src/pages/Player/Player.test.js

@@ -109,7 +109,20 @@ describe('<Player/>', function () {
 
         const func = jest.fn();
 
-        wrapper.setProps({history: {goBack: func}});
+        wrapper.setProps({history: {push: func}});
+
+        expect(func).toHaveBeenCalledTimes(0);
+        wrapper.find('.closebutton').simulate('click');
+        // there shouldn't be a backstack available
+        expect(func).toHaveBeenCalledTimes(1);
+    });
+
+    it('hide click with stack available', function () {
+        const wrapper = instance();
+
+        const func = jest.fn();
+
+        wrapper.setProps({history: {goBack: func, length: 5}});
 
         expect(func).toHaveBeenCalledTimes(0);
         wrapper.find('.closebutton').simulate('click');

src/pages/Player/Player.tsx

@@ -316,7 +316,7 @@ export class Player extends React.Component<Props, mystate> {
     closebtn(): void {
         const hist = this.props.history;
         if (hist.length > 1) {
-            this.props.history.goBack();
+            hist.goBack();
         } else {
             hist.push('/');
         }