new_contents: import sys
  
  sys.path.append('/usr/lib/archivematica/MCPServer')
  from passClasses import ReplacementDict
  
  def test_alternate_replacementdict_constructor():
      """
      This constructor allows serialized Python strings to be expanded
      into ReplacementDict instances.
      """
  
      d = {"foo": "bar"}
      assert ReplacementDict(d) == ReplacementDict.fromstring(str(d))
  
  def test_replacementdict_replace():
      d = ReplacementDict({"%PREFIX%": "/usr/local"})
      assert d.replace("%PREFIX%/bin/") == ["/usr/local/bin/"]
  
subject: Add passClasses tests