code: function findSuiteRec(suite, findFn) {
    if (findFn(suite)) return suite;
  
    for (const child of suite.children || []) {
      const result = findSuiteRec(child, findFn);
  
      if (result !== null) {
        return result;
      }
    }
  
    return null;
  }
docs: Recursively go through suite and its children
  and return the first that matches the findFn
  condition
  
  @param {Object} suite Starting point
  @param {Function} findFn Find function
  
  @returns {?Object} Matching suite or null