adding 2 new test cases

__tests__/LoginScreen.test.tsx

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+import Enzyme from 'enzyme';
+import Adapter from 'enzyme-adapter-react-16';
+
+Enzyme.configure({ adapter: new Adapter() });
+
+import React from 'react';
+import { shallow } from "enzyme";
+import LoginScreen from '../lib/screens/loginScreens/LoginScreen.tsx';
+
+describe("LoginScreen", () => {
+  it("renders without crashing", () => {
+    const wrapper = shallow(<LoginScreen />);
+    expect(wrapper).toMatchSnapshot();
+  });
+});

__tests__/NoteDetailModal.test.tsx

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+import Enzyme from 'enzyme';
+import Adapter from 'enzyme-adapter-react-16';
+
+Enzyme.configure({ adapter: new Adapter() });
+
+import React from 'react';
+import { shallow } from "enzyme";
+import NoteDetailModal from '../lib/screens/mapPage/NoteDetailModal.tsx';
+
+describe("NoteDetailModal", () => {
+  it("renders without crashing", () => {
+    const wrapper = shallow(<NoteDetailModal />);
+    expect(wrapper).toMatchSnapshot();
+  });
+});

__tests__/__snapshots__/LoginScreen.test.tsx.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`LoginScreen renders without crashing 1`] = `ShallowWrapper {}`;

__tests__/__snapshots__/NoteDetailModal.test.tsx.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`NoteDetailModal renders without crashing 1`] = `ShallowWrapper {}`;