new_contents: from matrixscreener import *
  
  def test_import_all():
      "global import * should import cam, experiment and imagej"
      assert 'cam' in globals()
      assert 'experiment' in globals()
      assert 'imagej' in globals()
  
  def test_module_has_attr():
      "import matrixscreener should import submodules"
      import matrixscreener
      assert hasattr(matrixscreener, 'cam')
      assert hasattr(matrixscreener, 'experiment')
      assert hasattr(matrixscreener, 'imagej')
  
subject: add test for import