@testset "Laguerre-Conway" begin
  using Thesis: laguerre_conway

  # Test that the propagator produces good periodic orbits (forwards and backwards)
  for T in rand(3600*1.5:3600*4, (5))
    start = oe_to_xyz([ (μs["Earth"]*(T/(2π))^2)^(1/3), rand(0.01:0.01:0.5), rand(0.01:0.01:0.45π), 0., 0., 1. ], μs["Earth"])
    orbit = start
    for _ in 1:5
      i = 0.
      while i < T
        orbit = laguerre_conway(orbit, μs["Earth"], 1.)
        i += 1
      end
      @test i ≈ T
      @test norm(orbit - start) < 1e-2
    end
    for _ in 1:5
      i = 0.
      while i > -T
        orbit = laguerre_conway(orbit, μs["Earth"], -1.)
        i -= 1
      end
      @test i ≈ -T
      @test norm(orbit - start) < 1e-2
    end
  end

end