def test_gas_giant_density():
planet = Planet(SUN)
planet.mass = planet.earth_in_solar_masses
planet.gas_giant = True
assert planet.density() == 1.2
planet.mass *= 2.0
assert round(planet.density(), 2) == 1.31
def test_radius():
planet = Planet(SUN)
planet.mass = planet.earth_in_solar_masses
assert round(planet.radius(), 2) == 6403.97
planet.gas_giant = True
planet.mass *= 20
assert round(planet.radius(), 2) == 25382.72
def test_regular_density():
planet = Planet(SUN)
planet.mass = planet.earth_in_solar_masses
assert round(planet.density(), 2) == 5.43
planet.gas_giant = True
planet.mass *= 20
assert round(planet.density(), 2) == 1.75
