Function getExpectedViewMode

tests/responsive.property.test.js:29–31

* Helper function to determine expected view mode based on screen width * @param {number} width - Screen width in pixels * @returns {string} - Expected view mode: 'single' or 'double'

(width)

   * @returns {string} - Expected view mode: 'single' or 'double'
   */
  function getExpectedViewMode(width) {
    return width < BREAKPOINT ? 'single' : 'double';
  }

  /**
   * Helper function to create a mock window object for testing