def test_reciprocal_cycles_six():
"""1/7 has longest under 8: 6-digit-long repeat, 0.(142857)."""
assert reciprocal_cycles(8) == 7
def test_reciprocal_cycles_one():
"""1/3 has longest under 4: 1-digit-long repeat, 0.(3)."""
assert reciprocal_cycles(4) == 3
def test_exception_for_non_integer():
"""Non-integers are not allowed as input."""
reciprocal_cycles(155.2223)
def test_reciprocal_cycles_none():
"""Confirm that if no patterns exist, we get None."""
assert reciprocal_cycles(3) == None
def test_exception_for_less_than_1():
"""Numbers less than 1 are not allowed as input."""
reciprocal_cycles(0)