Problem with pigpio PWM duty cycle 0.0, failure in test_real_pins.py

bad_test.py

import gpiozero
from gpiozero.pins.pigpiod import PiGPIOPin

# Place a jumper across these two pins.
# Physical pins # 13 and 15 on a B+
test_pin = PiGPIOPin(27)
input_pin = PiGPIOPin(22)

test_pin.function = 'output'
test_pin.frequency = 100

# I think something is wrong with this line
# see: http://abyz.co.uk/rpi/pigpio/python.html#set_PWM_dutycycle
# "Starts (non-zero dutycycle) or stops (0) PWM pulses on the GPIO."
test_pin.state = 0.0

raw_input("do your measurements, replace the jumper, then press enter")

# test pin appears to be floating, not 0 as expected.
# input pin is at 3.3 volts

# Fails
assert input_pin.state == False