Mixed here meaning it contains ``<w:tab/>``, ``<w:cr/>``, etc. elements.

def given_a_run_having_mixed_text_content(context):
    """
    Mixed here meaning it contains ``<w:tab/>``, ``<w:cr/>``, etc. elements.
    """
    r_xml = """\
        <w:r %s>
          <w:t>abc</w:t>
          <w:tab/>
          <w:t>def</w:t>
          <w:cr/>
          <w:t>ghi</w:t>
          <w:drawing/>
          <w:br/>
          <w:t>jkl</w:t>
        </w:r>""" % nsdecls('w')
    r = parse_xml(r_xml)
    context.run = Run(r, None)