def test_compile_empty_header_raises_type_error(self):
class EmptyHeader(Header):
pass
with raises(TypeError):
compile_struct(EmptyHeader)
def test_compile_header_coincident_fields_with_different_types_raises_type_error(
self):
class CoincidentFieldsWithDifferentTypesHeader(Header):
field_a = field(Int32, 1, 0, "Field A.")
field_b = field(NNInt32, 1, 0, "Field B.")
with raises(TypeError):
compile_struct(CoincidentFieldsWithDifferentTypesHeader)
def test_compile_header_coincident_fields_with_different_types_raises_type_error(self):
class CoincidentFieldsWithDifferentTypesHeader(Header):
field_a = field(Int32, 1, 0, "Field A.")
field_b = field(NNInt32, 1, 0, "Field B.")
with raises(TypeError):
compile_struct(CoincidentFieldsWithDifferentTypesHeader)
def test_compile_header_with_partially_overlapping_fields_raises_value_error(
self):
class OverlappingFieldsHeader(Header):
field_a = field(Int32, 1, 0, "Field A.")
field_b = field(Int32, 3, 0, "Field B.")
with raises(ValueError):
compile_struct(OverlappingFieldsHeader)
def test_compile_header_with_partially_overlapping_fields_raises_value_error(self):
class OverlappingFieldsHeader(Header):
field_a = field(Int32, 1, 0, "Field A.")
field_b = field(Int32, 3, 0, "Field B.")
with raises(ValueError):
compile_struct(OverlappingFieldsHeader)
def test_compile_header_with_too_short_length_raises_value_error(self):
class ShortHeader(Header):
START_OFFSET_IN_BYTES = 1
LENGTH_IN_BYTES = 3
field_a = field(Int32, 1, 0, "Field A.")
with raises(ValueError):
compile_struct(ShortHeader, ShortHeader.START_OFFSET_IN_BYTES,
ShortHeader.LENGTH_IN_BYTES)
def test_compile_header_with_too_short_length_raises_value_error(self):
class ShortHeader(Header):
START_OFFSET_IN_BYTES = 1
LENGTH_IN_BYTES = 3
field_a = field(Int32, 1, 0, "Field A.")
with raises(ValueError):
compile_struct(ShortHeader, ShortHeader.START_OFFSET_IN_BYTES, ShortHeader.LENGTH_IN_BYTES)
def test_compile_surjective_header_packer_successfully(self, endian):
class SurjectiveHeader(Header):
field_a = field(Int32, 1, 0, "Field A.")
field_b = field(NNInt32, 5, 0, "Field B.")
field_c = field(Int32, 1, 0, "Field C.")
cformat, field_name_allocations = compile_struct(SurjectiveHeader, 1, endian=endian)
assert cformat[0] == endian
assert cformat[1] == 'i'
assert field_name_allocations == [['field_a','field_c'], ['field_b']]
def test_compile_surjective_header_packer_successfully(self, endian):
class SurjectiveHeader(Header):
field_a = field(Int32, 1, 0, "Field A.")
field_b = field(NNInt32, 5, 0, "Field B.")
field_c = field(Int32, 1, 0, "Field C.")
cformat, field_name_allocations = compile_struct(SurjectiveHeader,
1,
endian=endian)
assert cformat[0] == endian
assert cformat[1] == 'i'
assert field_name_allocations == [['field_a', 'field_c'], ['field_b']]
def test_compile_empty_header_raises_type_error(self):
class EmptyHeader(Header):
pass
with raises(TypeError):
compile_struct(EmptyHeader)
def test_compile_with_non_positive_length_raises_value_error(self):
with raises(ValueError):
compile_struct(None, 0, 0)
def test_compile_with_negative_start_offset_raises_value_error(self):
with raises(ValueError):
compile_struct(None, -1, 1)
def test_compile_with_non_positive_length_raises_value_error(self):
with raises(ValueError):
compile_struct(None, 0, 0)
def test_compile_with_negative_start_offset_raises_value_error(self):
with raises(ValueError):
compile_struct(None, -1, 1)