def test_y2i(self):
"""
Should convert between y indices and coordinates and back
"""
r1 = (-10, -20, -30)
r2 = (10, 20, 30)
vm = VM(r1=r1, r2=r2, dx=1, dy=1, dz=1)
iy = vm.y2i([vm.r1[1]])[0]
y = vm.i2y([iy])[0]
self.assertEqual(iy, 0)
self.assertEqual(y, vm.r1[1])
iy = vm.y2i([vm.r2[1]])[0]
y = vm.i2y([iy])[0]
self.assertEqual(iy, vm.ny - 1)
self.assertEqual(y, vm.r2[1])
