def test_orbit_zone():
planet = Planet(SUN)
assert planet.orbit_zone() == 1
planet.axis = 4
assert planet.orbit_zone() == 2
planet.axis = 22
assert planet.orbit_zone() == 3
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_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_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
