client-reactnative/__tests__/Chat/RenderDay-test.tsx
import React from 'react';
import renderer from 'react-test-renderer';
import RenderDay from '../../src/components/Chat/RenderDay';
test("renders correctly", ()=>{
const tree = renderer.create(
<RenderDay
currentMessage={{}}
previousMessage={{}}
/>
).toJSON();
expect(tree).toMatchSnapshot();
})