old_contents: 'use strict';
  
  const isPlainObj = require( 'is-plain-obj' );
  
  test( 'node', () => {
  	const conf = require( '../../lib/configs/strict-mode' );
  
  	expect( isPlainObj( conf ) ).toBe( true );
  	expect( isPlainObj( conf.rules ) ).toBe( true );
  });
  
new_contents: 'use strict';
  
  const isPlainObj = require( 'is-plain-obj' );
  
  test( 'strict', () => {
  	const conf = require( '../../lib/configs/strict-mode' );
  
  	expect( isPlainObj( conf ) ).toBe( true );
  	expect( isPlainObj( conf.rules ) ).toBe( true );
  });
  
subject: use `strict` for the test description of strict-mode config tests