before each() error in enzyme unit testing

I'm writing a test using enzyme for react application. When I tried to write a test for a component under several layers, before each() error comes up.

In the terminal, it says ✖ "before each" hook for "Tests Logout component rendering"

Here is the code.

import React from 'react'
import { shallow } from 'enzyme'
import Logout from 'components/Navbar/Logout'

describe('(Component) Logout', () => {
    let _wrapper

    const render = () => {
   _wrapper = shallow(<Logout />)
   }
   beforeEach(() => {
   render()
   })

  it('Tests Logout component rendering', () => {
  expect(_wrapper.find('.logout').length).to.equal(1)
  expect(_wrapper.find('div').length).to.equal(1)
  expect(_wrapper.find('i').length).to.equal(1)
  })
 })

I don't receive any error for another component which a single layers like components/Input. How can I fix this issue?

Thank you.