def test_Transporter_images_is_a_string_and_is_missing():
trans_obj = Transporter()
trans_obj.add_images("missing_image.jpg")
# if there are no images, then no Content-ID added to msg_root
assert 'Content-ID' not in trans_obj.msg_root
def test_Transporter_images_is_a_text_file():
trans_obj = Transporter()
trans_obj.add_images("test_emailer.py")
# if there are no images, then no Content-ID added to msg_root
print(trans_obj.msg_root)
assert 'Content-ID' not in trans_obj.msg_root
def test_Transporter_missing_images():
trans_obj = Transporter()
trans_obj.add_images(["missing_image.jpg"])
# if there are no images, then no Content-ID added to msg_root
assert 'Content-ID' not in trans_obj.msg_root
