def test_pixel_size(self):
"""Test pixel size calculation."""
z = randint(0, 21)
result = Mercator.pixel_size(z)
assert result * 2**z == 156543.033928041
def test_pixel_size(self):
"""Test pixel size calculation."""
z = randint(0, 21)
result = Mercator.pixel_size(z)
assert result * 2**z == 156543.033928041
