def test_unhashable_mutables_2():
"""Mutable bitfields are not instances of collections.Hashable
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)],
mutable=True)
test1 = nbf(2, 5, 2)
ok_(not isinstance(test1, collections.Hashable))
def test_unhashable_mutables_1():
"""Attempting to hash a mutable bitfield raises
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)],
mutable=True)
test1 = nbf(2, 5, 2)
hash(test1)
def test_immutable_no_setter():
"""Trying to use a field of an immutable bitfield as an lvalue raises
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)],
mutable=False)
test1 = nbf(3, 7, 1)
test1.a = 0
def test_set_too_big():
"""Setting a field to a value that doesn't fit in those bits raises
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)],
mutable=True)
test1 = nbf()
test1.b = 2**6 - 1
def test_immutable_hashes_as_int():
"""Hash of a mutable bitfield is the hash of the int
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)],
mutable=False)
test1 = nbf(2, 5, 2)
eq_(hash(test1), hash(int(test1)))
def test_immutable_is_hashable():
"""Immutable bitfields are instances of collections.Hashable
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)],
mutable=False)
test1 = nbf(2, 5, 2)
ok_(isinstance(test1, collections.Hashable))
def test_endianness():
"""When creating a named_bitfield, the first field is the most significant
"""
nbf = named_bitfield('TestBitfield', [('a', 4), ('b', 4)])
test1 = nbf(0, 15)
test2 = nbf(15, 0)
assert_greater(test2, test1)
def test_equality_same_type():
"""Equality works as expected within a named_bitfield type
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)])
test1 = nbf(2, 5, 2)
test2 = nbf(2, 5, 2)
eq_(test1, test2)
def test_gt_same_type():
"""Greater than works within a named_bitfield type
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)])
test1 = nbf(2, 5, 2)
test2 = nbf(0, 0, 0)
ok_(test1 > test2)
def test_from_int():
"""Can create a named_bitfield from an integer
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)])
test1 = nbf.fromint(85)
eq_(test1.a, 1)
eq_(test1.b, 5)
eq_(test1.c, 1)
def test_positional_init():
"""Can initilize field values by position
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)])
test1 = nbf(3, 7, 3)
eq_(test1.a, 3)
eq_(test1.b, 7)
eq_(test1.c, 3)
def test_mixed_init():
"""Can initilize field values by keyword arg
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)])
test1 = nbf(3, c=2, b=7)
eq_(test1.a, 3)
eq_(test1.b, 7)
eq_(test1.c, 2)
def test_has_attributes():
"""Instances of the named_bitfield have attributes matching the field names
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)])
test1 = nbf()
ok_(hasattr(test1, 'a'))
ok_(hasattr(test1, 'b'))
ok_(hasattr(test1, 'c'))
ok_(not hasattr(test1, 'bogus'))
def test_to_oct():
"""Correctly show octal representation when asked
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)])
test1 = nbf(2, 5, 2)
expected = '0226'
if six.PY3:
expected = '0o226'
eq_(oct(test1), expected)
def test_set_attributes():
"""Can set the attributes of a named_bitfield
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)],
mutable=True)
test1 = nbf()
test1.a = 3
test1.b = 7
test1.c = 1
eq_(test1.a, 3)
eq_(test1.b, 7)
eq_(test1.c, 1)
def test_invalid_types():
"""named_bitfield fields must be integer values
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)],
mutable=True)
test1 = nbf()
def check_setter(obj, val):
"Try to set a value, so we can trap the exception"
obj.a = val
assert_raises(TypeError, check_setter, test1, [1, 2, 3])
assert_raises(TypeError, check_setter, test1, (1, 2, 3))
assert_raises(TypeError, check_setter, test1, 'bogus')
def test_instance_attributes():
"""named_bitfield attributes are instance, not class, attributes
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)])
test1 = nbf(3, 7, 1)
test2 = nbf(0, 0, 0)
eq_(test1.a, 3)
eq_(test1.b, 7)
eq_(test1.c, 1)
eq_(test2.a, 0)
eq_(test2.b, 0)
eq_(test2.c, 0)
def test_overrun():
"""Overrunning a field doesn't corrupt the adjecent fields
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)],
mutable=True)
test1 = nbf()
test1.a = 0
test1.b = 7
test1.c = 0
try:
test1.b = 2**6 - 1
except ValueError:
# Other tests make sure this raises the right error; here we just want
# to check for side effects
pass
eq_(test1.a, 0)
# b is in an undefined state, no sane test for its value
eq_(test1.c, 0)
def test_from_int_validation():
"""Passing fromint a value with more bits than defined in the spec raises
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)])
nbf.fromint(1024)
def test_init_too_big():
"""Initilizing a field to a value that doesn't fit raises
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)])
nbf(1024, 1024, 1024)
def test_unknown_kwarg():
"""Unknown field names in kwargs raises type error
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)])
nbf(c=2, a=3, b=7, x=4)
def test_to_long():
"""Can cast the named_bitfield to a long correctly
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)])
test1 = nbf(2, 5, 2)
eq_(int(test1), 150)
def test_to_hex():
"""Correctly show hex representation when asked
"""
nbf = named_bitfield('TestBitfield', [('a', 2), ('b', 4), ('c', 2)])
test1 = nbf(2, 5, 2)
eq_(hex(test1), '0x96')
