subroutine test_change_n_levels_surface(this)
class(ESMF_TestMethod), intent(inout) :: this
type(ESMF_Field) :: f
type(ESMF_Grid) :: grid
type(ESMF_Geom) :: geom
integer :: status
type(ESMF_FieldStatus_Flag) :: field_status
type(ESMF_TypeKind_Flag) :: typekind
real(ESMF_KIND_R4), pointer :: x(:,:,:,:)
type(FieldDelta) :: delta
grid = ESMF_GridCreateNoPeriDim(maxIndex=[4,4], name='I_AM_GROOT', _RC)
geom = ESMF_GeomCreate(grid, _RC)
! Surface field
f = ESMF_FieldCreate(geom, typekind=ESMF_TYPEKIND_R4, name='in', &
ungriddedLbound=[1,1], ungriddedUbound=[2,3], _RC)
call MAPL_FieldSet(f, num_levels=0, vert_staggerloc=VERTICAL_STAGGER_NONE, _RC)
call ESMF_FieldGet(f, fArrayPtr=x, _RC)
x = FILL_VALUE
delta = FieldDelta(num_levels=4)
call delta%reallocate_field(f, _RC)
call ESMF_FieldGet(f, status=field_status, typekind=typekind, _RC)
@assert_that(field_status == ESMF_FIELDSTATUS_COMPLETE, is(true()))
@assert_that(typekind == ESMF_TYPEKIND_R4, is(true()))
call ESMF_FieldGet(f, fArrayPtr=x, _RC)
@assert_that(shape(x), is(equal_to([4,4,2,3])))
@assert_that(all(x == FILL_VALUE), is(true()))
call ESMF_FieldDestroy(f, _RC)
call ESMF_GridDestroy(grid, _RC)
call ESMF_GeomDestroy(geom, _RC)
_UNUSED_DUMMY(this)
end subroutine test_change_n_levels_surface