def METHOD_NAME(test_object):
    """
    Test will simulate the 'Convert isodose to roi' button being
    pressed, assert structure count is greater than or equal to what it
    originally was.
    :param test_object: test_object function, for accessing the shared
                        TestIso2RoiGui object.
    """
    # Simulate 'Convert Isodose to ROI' button being pressed
    test_object.main_window.isodoses_tab.iso2roi_button_clicked()
    # Get the new length of structures in Structures Tab
    current_structure_count = \
        test_object.main_window.structures_tab.layout_content.count()
    # Assert the length has not changed
    assert current_structure_count >= test_object.initial_structure_count