class: "OutputTest"
success: "PASS"
failure: "NO PASS"

# Python statements initializing variables for the test below.
preamble: """
import inference

dist = inference.DiscreteDistribution()
dist['a'] = 0
ans5 = dist.normalize()

# ans = map(float, [ans1, ans2, ans3, ans4])
ans = map(float, [ans5 is None])
"""

# A python expression to be evaluated.  This expression must return the 
# same result for the student and instructor's code.

test: "ans"