Seems like a lot changed...

julia/test/propagator.jl

@@ -1,21 +1,27 @@
 @testset "Propagator" begin
 
-  println("Testing propagator")
+  using PlotlyJS: savefig
 
-  using Thesis: prop_one
+  println("Testing Propagator")
 
   # Set up
   start_mass = 10_000.
   start = gen_orbit(rand(.5year : hour : 2year), start_mass)
-  stepsize = rand(hour : second : 6hour)
+  time = rand(0.2year : second : 0.5year)
+  n = 1_000
 
-  # Test that Laguerre-Conway is the default propagator for spacecrafts
-  state = prop_one([0., 0., 0.], start, no_thrust, stepsize)
-  @test laguerre_conway(start, stepsize) ≈ state[1:6]
-  @test state[7] == start_mass
+  # Test that Propagation works
+  states = prop(zeros(n,3), start, no_thrust, time)
+  @test states[1,:] != states[end,:]
 
   # Test that mass is reduced properly
-  state = prop_one([1., 0., 0.], start, bepi, stepsize)
-  @test state[7] == start_mass - mfr(bepi)*stepsize
-  
+  states = prop(ones(n,3)/√3, start, bepi, time)
+  @test states[end,7] ≈ start_mass - mfr(bepi)*time
+
+  # Test that the propagator works backwards
+  backwards = prop(ones(n,3)/√3, states[end,:], bepi, -time)
+  p = plot([states, backwards])
+  savefig(p,"../plots/prop_back.html")
+  @test backwards[end,:] ≈ start
+
 end