clean up tests

def test_case_2():

  v = l1p1.div7(39, 2)

  assert (v%7) == 0

  assert v == 329

  assert (v == 329 or v == 392)

@given(st.integers(min_value=10), st.integers(min_value=0, max_value=9))

def test_digit_order(n, i):

def test_div_by_7(n, i):

  # don't worry about errors

  try:

    assert l1p1.div7(n, i) % 7 == 0

    x = l1p1.div7(n, i) 

    assert x % 7 == 0

  except Exception as e:

    assert str(e) == "not possible"