using Test

include("collatz-conjecture.jl")

@testset verbose = true "tests" begin
    # canonical data
    @testset "Canonical data" begin
        @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)
    end
end