Method from

test/common/wpt.js:350–354

* @param {string} mod * @param {string} filename * @param {StatusRule[]} rules * @returns {ReturnType []}

(mod, filename, rules)

   * @returns {ReturnType<WPTTestSpec['getMeta']>[]}
   */
  static from(mod, filename, rules) {
    const spec = new WPTTestSpec(mod, filename, rules);
    const meta = spec.getMeta();
    return meta.variant?.map((variant) => new WPTTestSpec(mod, filename, rules, variant)) || [spec];
  }

  /**
   * Check if a subtest should be skipped by name.