def test_smallest_int_sctype(self):
# Smallest int sctype with full recaster
params = sctype_attributes()
RF = Recaster()
test_triples = [(N.uint8, 0, 255),
(N.int8, -128, 0),
(N.uint16, 0, params[N.uint16]['max']),
(N.int16, params[N.int16]['min'], 0),
(N.uint32, 0, params[N.uint32]['max']),
(N.int32, params[N.int32]['min'], 0),
(N.uint64, 0, params[N.uint64]['max']),
(N.int64, params[N.int64]['min'], 0)]
for T, mn, mx in test_triples:
rt = RF.smallest_int_sctype(mx, mn)
assert N.dtype(rt) == N.dtype(T), \
'Expected %s, got %s type' % (T, rt)
# Smallest int sctype with restricted recaster
mmax = params[N.int32]['max']
mmin = params[N.int32]['min']
RR = Recaster([N.int32])
for kind in ('int', 'uint'):
for T in N.sctypes[kind]:
mx = params[T]['max']
mn = params[T]['min']
rt = RR.smallest_int_sctype(mx, mn)
if mx <= mmax and mn >= mmin:
assert rt == N.int32, \
'Expected int32 type, got %s' % rt
else:
assert rt is None, \
'Expected None, got %s for %s' % (T, rt)
# Test preferred int flag
mx = 1000
mn = 0
rt = RF.smallest_int_sctype(mx, mn)
assert rt == N.int16, 'Expected int16, got %s' % rt
rt = RF.smallest_int_sctype(mx, mn, 'i')
assert rt == N.int16, 'Expected int16, got %s' % rt
rt = RF.smallest_int_sctype(mx, mn, prefer='u')
assert rt == N.uint16, 'Expected uint16, got %s' % rt
