using Base.Test

include("collatz-conjecture.jl")

# canonical data
@test collatz_steps(1) == 0
@test collatz_steps(16) == 4
@test collatz_steps(12) == 9
@test collatz_steps(1000000) == 152
@test_throws DomainError collatz_steps(0)
@test_throws DomainError collatz_steps(-15)