text: const fooContext = {}
  
  function foo () {
  	// inside a function, `this` should be untouched...
  	assert.strictEqual( this, fooContext );
  }
  
  const bar = () => {
  	// ...unless it's an arrow function
  	assert.strictEqual( this, undefined );
  }
  
  foo.call( fooContext );
  bar.call( {} );
  
  // outside a function, `this` is undefined
  assert.strictEqual( this, undefined );
  