Test a react component using test and react-testing-library

I just joined a team where we use react, redux, recompose to construct components to build UI. There aren't any unit tests in the application and there isn't consistent architecture for the application. I decided to take it upon myself to add unit tests using jest and react-testing-library. I succeed with few snapshot tests but I am struggling with unit testing. I am still learning react and pretty new to redux. I would love some suggestion. I am going to share a component which renders a table with column and row. I would love a feedback.

import React, { useEffect, useState } from 'react';
import { compose } from 'recompose';
import { connect } from 'react-redux';

import { clearAll, fetchContacts } from '~/store/resources/contacts/actions';
import { isDevEnv } from '~/utils';

import Sidebar from './Sidebar';
import Table from './Table';
import Toolbar from './Toolbar';

const Contacts = ({ clearAll, fetchContacts, ...props }) => {
  const [searchValue, setSearchValue] = useState('');
  const [isSidebarOpen, setIsSidebarOpen] = useState(false);
  const [canonicalFormValues, setCanonicalFormValues] = useState({ active: true });

  useEffect(() => {
    fetchContacts();
    return () => {
      clearAll();
    };
  }, []);

  const closeSidebar = () => {
    if (isDevEnv) {
      console.log('hit close function');
    }
    setIsSidebarOpen(false);
  };

  return (
    <div>
      <Toolbar
        searchValue={searchValue}
        setSearchValue={setSearchValue}
        setIsSidebarOpen={setIsSidebarOpen}
      />
      <Table setCanonicalFormValues={setCanonicalFormValues} />
      <Sidebar
        isSidebarOpen={isSidebarOpen}
        closeSidebar={closeSidebar}
        canonicalFormValues={canonicalFormValues}
      />
      {isDevEnv && (
        <div>
          This is coming from the contact folder
          <br />
          state values:
          <br />
          {JSON.stringify({ searchValue })}
          <br />
          {JSON.stringify({ isSidebarOpen })}
          <br />
          {JSON.stringify({ canonicalFormValues })}
        </div>
      )}
    </div>
  );
};

const mapDispatchToProps = {
  clearAll,
  fetchContacts,
};

export default compose(
  connect(
    null,
    mapDispatchToProps,
  ),
)(Contacts);