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# test MicroPython-specific features of struct
try:
import ustruct as struct
except:
try:
import struct
except ImportError:
print("SKIP")
raise SystemExit
try:
struct.pack('O', None)
except ValueError:
print("SKIP")
raise SystemExit
class A():
pass
# pack and unpack objects
o = A()
s = struct.pack("<O", o)
o2 = struct.unpack("<O", s)
print(o is o2[0])
# pack can accept less arguments than required for the format spec
print(struct.pack('<2I', 1))
# pack and unpack pointer to a string
# This requires uctypes to get the address of the string and instead of
# putting this in a dedicated test that can be skipped we simply pass
# if the import fails.
try:
import uctypes
o = uctypes.addressof('abc')
s = struct.pack("<S", o)
o2 = struct.unpack("<S", s)
assert o2[0] == 'abc'
except ImportError:
pass
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