@testset "Phase" begin

  println("Testing NLP solver")

  using NLsolve, PlotlyJS

  # Initial Setup
  T = rand( 2hour : second : 12hour)
  revs = 5
  n = 10revs
  start_mass = 12_000.

  # A simple orbit raising
  start = gen_orbit(T, start_mass, Earth)
  thrust = spiral(0.9, n, start, test_sc, revs*T, Earth)
  final = prop(thrust, start, test_sc, revs*T, Earth)[2]
  new_T = 2π * √( xyz_to_oe(final, Earth.μ)[1]^3 / Earth.μ )

  # This should be close enough to converge
  thrust_guess = spiral(0.88, n, start, test_sc, revs*T, Earth)
  result = solve_phase(start, final, test_sc, revs*T, thrust_guess, Earth)
  calc_path, calc_final = prop(result.zero, start, test_sc, revs*T, Earth)

  # Test
  @test converged(result)
  @test norm(calc_final[1:6] - final[1:6]) < 1e-5

  # Plot
  paths = Pathlist()
  push!(paths, prop(start, T, Earth),
               calc_path,
               prop(calc_final, T, Earth),
               prop(final, T, Earth) )
  fig = plot_orbits(paths, Earth,
                    labels=["init", "transit", "post-transit", "final"],
                    colors=["#FFF","#F44","#4F4","#44F"])
  savefig(fig, "../plots/nlp_test.html")

end