def test_parabolic_has_zero_energy():
attractor = Earth
_d = 1.0 * u.AU # Unused distance
_ = 0.5 * u.one # Unused dimensionless value
_a = 1.0 * u.deg # Unused angle
ss = State.parabolic(attractor, _d, _a, _a, _a, _a)
assert_almost_equal(ss.energy.value, 0.0)
def test_parabolic_has_infinite_semimajor_axis():
attractor = Earth
_d = 1.0 * u.AU # Unused distance
_ = 0.5 * u.one # Unused dimensionless value
_a = 1.0 * u.deg # Unused angle
expected_a = np.inf * u.km
ss = State.parabolic(attractor, _d, _a, _a, _a, _a)
assert_equal(ss.a, expected_a)
def test_parabolic_has_proper_eccentricity():
attractor = Earth
_d = 1.0 * u.AU # Unused distance
_ = 0.5 * u.one # Unused dimensionless value
_a = 1.0 * u.deg # Unused angle
expected_ecc = 1.0 * u.one
ss = State.parabolic(attractor, _d, _a, _a, _a, _a)
assert_almost_equal(ss.ecc, expected_ecc)