require "../../src/engine/trajectory"

describe Trajectory do
  it "test without gravity field nor acceleration" do
    t = Trajectory(2).new(body: Gravity::MovingBody.new(mass: 1.0, position: Vector[0.0, 0.0], speed: Vector[1.0, 0.5]))
    points = t.compute(steps: 10, accuracy: Time::Span.new(seconds: 1))
    points.size.should eq(10)
    points[0].should eq(Vector[1.0, 0.5])
    points[1].should eq(Vector[2.0, 1.0])
    points[2].should eq(Vector[3.0, 1.5])
    points[3].should eq(Vector[4.0, 2.0])
  end
end