Test for handleNewMedia method with Alert feature

__tests__/AddNoteScreen.test.tsx

@@ -3,13 +3,42 @@ import Adapter from 'enzyme-adapter-react-16';
 
 Enzyme.configure({ adapter: new Adapter() });
 
-import React from 'react';
+import React, { SetStateAction, useState } from 'react';
+import { TouchableOpacity, Alert } from 'react-native';
 import { shallow } from "enzyme";
+import { requestMediaLibraryPermissionsAsync, launchImageLibraryAsync } from "expo-image-picker";
+import handleNewMedia from "../lib/components/photoScroller";
+
 import AddNoteScreen from '../lib/screens/AddNoteScreen';
+import PhotoScroller from "../lib/components/photoScroller";
+import { Media } from '../lib/models/media_class';
+
 
 describe("AddNoteScreen", () => {
   it("renders without crashing", () => {
     const wrapper = shallow(<AddNoteScreen />);
     expect(wrapper).toMatchSnapshot();
   });
 });
+
+describe('PhotoScroller\'s handleNewMedia method', () => {
+  it('Show an alert when pressed with Take a photo or Choose a photo from camera roll', () => {
+
+    const wrapper = shallow(<PhotoScroller newMedia={[]} setNewMedia={function (value: SetStateAction<Media[]>): void {
+      throw new Error('Function not implemented.');
+    } } active={true} />);
+    const button = wrapper.find('[testID="photoScrollerButton"]');
+
+    const mockAlert = jest.spyOn(Alert, 'alert');
+    button.props().onPress();
+
+    wrapper.find(TouchableOpacity).prop('onPress')();
+
+    expect(mockAlert).toHaveBeenCalledWith(
+      'Select Media',
+      'Choose the source for your media:',
+      expect.any(Array),
+      { cancelable: false }
+    );
+  });
+});

lib/components/photoScroller.tsx

@@ -375,6 +375,7 @@ const PhotoScroller = forwardRef(
           {playing && renderImageView()}
           <View style={{ flexDirection: "row" }}>
             <TouchableOpacity
+              testID="photoScrollerButton"
               style={[
                 PhotoStyles.image,
                 {

lib/screens/AddNoteScreen.tsx

@@ -145,6 +145,7 @@ const AddNoteScreen: React.FC<AddNoteScreenProps> = ({ navigation, route }) => {
             setIsLocation(false);
             setIsTime(false);
           }}
+          testID="images-icon"
         >
           <Ionicons name="images-outline" size={30} color="black" />
         </TouchableOpacity>