function setUpTextWithTspan () {
    setUp()
    elem = document.createElementNS(NS.SVG, 'text')
    elem.setAttribute('x', '200')
    elem.setAttribute('y', '150')

    const tspan = document.createElementNS(NS.SVG, 'tspan')
    tspan.setAttribute('x', '200')
    tspan.setAttribute('y', '150')

    const theText = 'Foo bar'
    tspan.append(theText)
    elem.append(tspan)
    svg.append(elem)
  }
Initialize for tests and set up `text` element with `tspan` child.
@returns {void}