def test_orbital_period():
planet = Planet(SUN)
planet.mass = planet.earth_in_solar_masses
planet.axis = 1
assert round(planet.orbital_period(), 2) == 365.25
planet.axis = 5.2
assert round(planet.orbital_period(), 2) == 4331.13
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_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_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
def test_axial_tilt():
planet = Planet(SUN)
planet.mass = planet.earth_in_solar_masses
planet.axis = 1
tilts = set()
for i in range(0, 100):
tilts.add(Planet(SUN).axial_tilt())
assert len(tilts) > 0
assert min(tilts) > 0
assert max(tilts) < 360
def test_surface_acceleration():
planet = Planet(SUN)
planet.mass = planet.earth_in_solar_masses
assert round(planet.surface_acceleration(), 2) == 972.39
def test_escape_velocity():
planet = Planet(SUN)
planet.mass = planet.earth_in_solar_masses
assert round(planet.escape_velocity(), -3) == 1116000
planet.mass = planet.earth_in_solar_masses * 0.107
assert round(planet.escape_velocity(), -3) == 527000
def test_day():
planet = Planet(SUN)
planet.mass = planet.earth_in_solar_masses
planet.axis = 1
planet.star.specified_age = 4.6e9
assert round(planet.day(), 2) == 16.21
def test_earth_mass():
planet = Planet(SUN)
planet.mass = 1.0
assert planet.earth_mass() == 332775.64
planet.mass = planet.earth_in_solar_masses
assert planet.earth_mass() == 1.0