def test_age_on_uranus(self):
     age = SpaceAge(3210123456)
     self.assertEqual(age.on_earth(), 101.72)
     self.assertEqual(age.on_uranus(), 1.21)

 def test_age_on_neptune(self):
     age = SpaceAge(8210123456)
     self.assertEqual(age.on_earth(), 260.16)
     self.assertEqual(age.on_neptune(), 1.58)

 def test_age_on_jupiter(self):
     age = SpaceAge(901876382)
     self.assertEqual(age.on_earth(), 28.58)
     self.assertEqual(age.on_jupiter(), 2.41)

 def test_age_on_saturn(self):
     age = SpaceAge(3e9)
     self.assertEqual(age.on_earth(), 95.06)
     self.assertEqual(age.on_saturn(), 3.23)

 def test_age_in_venus_years(self):
     age = SpaceAge(189839836)
     self.assertEqual(age.on_earth(), 6.02)
     self.assertEqual(age.on_venus(), 9.78)

 def test_age_on_mars(self):
     age = SpaceAge(2329871239)
     self.assertEqual(age.on_earth(), 73.83)
     self.assertEqual(age.on_mars(), 39.25)

 def test_age_in_mercury_years(self):
     age = SpaceAge(2134835688)
     self.assertEqual(age.on_earth(), 67.65)
     self.assertEqual(age.on_mercury(), 280.88)

 def test_age_in_earth_years(self):
     age = SpaceAge(1e9)
     self.assertEqual(age.on_earth(), 31.69)

 def test_age_on_saturn(self):
     age = SpaceAge(3e9)
     self.assertEqual(95.06, age.on_earth())
     self.assertEqual(3.23, age.on_saturn())

 def test_age_on_mars(self):
     age = SpaceAge(2329871239)
     self.assertEqual(73.83, age.on_earth())
     self.assertEqual(39.25, age.on_mars())

 def test_age_in_venus_years(self):
     age = SpaceAge(189839836)
     self.assertEqual(6.02, age.on_earth())
     self.assertEqual(9.78, age.on_venus())