@testset "Spacecraft Construction" begin

  # Test that the standard spacecraft can be created
  craft = Sc("test")
  @test craft.mass == 10000.
  @test craft.mass_flow_rate == 0.01
  @test craft.max_thrust == 0.05
  @test craft.num_thrusters == 2
  @test craft.duty_cycle == 1.
  
  craft = Sc("no_thrust")
  @test craft.mass == 10000.
  @test craft.mass_flow_rate == 0.01
  @test craft.max_thrust == 0.
  @test craft.num_thrusters == 0
  @test craft.duty_cycle == 0.

end