Update gentest to account for box sizing (#1700)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1700

tsia, need to teach gentest to write box sizing now.

Reviewed By: NickGerleman

Differential Revision: D63138372

fbshipit-source-id: 29072b3e602fe77edb14a8857a83e5bba4c92205

javascript/tests/generated/YGMarginTest.test.ts

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<910ea7258ef002557289f475dc74f3dc>>
+ * @generated SignedSource<<3a4aaa192f950239104218a9666654c1>>
  * generated by gentest/gentest-driver.ts from gentest/fixtures/YGMarginTest.html
  */
 
@@ -12,6 +12,7 @@ import { instrinsicSizeMeasureFunc } from '../tools/utils.ts'
 import Yoga from 'yoga-layout';
 import {
   Align,
+  BoxSizing,
   Direction,
   Display,
   Edge,