require "../../../src/engine/gravity/field"

describe Gravity::Field do
  it "accelerate arbitrary points" do
    earth = Gravity::Body(2).new(mass: 5972200000000000000000000.0, position: Vector[0.0, 0.0])
    field = Gravity::Field(2).new([earth])
    field = Gravity::Field(2).new(earth)
    field = Gravity::Field(2).new({earth})
    earth_surface = Vector[6371000.0, 0.0]
    earth.acceleration(earth_surface).magnitude.round(2).should eq(9.82)
  end
end