@testset "Spacecraft Construction" begin

  println("Testing spacecraft")

  # Test that the standard spacecraft can be created
  craft = Sc("test")
  @test craft.dry_mass == 9000.
  @test craft.mass_flow_rate == craft.max_thrust/(0.00981*2000)
  @test craft.max_thrust == 0.00025
  @test craft.num_thrusters == 50
  @test craft.duty_cycle == 0.9
  
  craft = Sc("no_thrust")
  @test craft.dry_mass == 9000.
  @test craft.mass_flow_rate == 0.01
  @test craft.max_thrust == 0.
  @test craft.num_thrusters == 0
  @test craft.duty_cycle == 0.
  
  # Test that the standard spacecraft can be copied
  new_craft = copy(craft)
  @test new_craft.dry_mass == craft.dry_mass
  @test new_craft.mass_flow_rate == craft.mass_flow_rate
  @test new_craft.max_thrust == craft.max_thrust
  @test new_craft.num_thrusters == craft.num_thrusters
  @test new_craft.duty_cycle == craft.duty_cycle

end