Fix Bitvector

ssz/sedes/bitvector.py

@@ -30,7 +30,7 @@ def __init__(self, size: int) -> None:
     is_fixed_sized = True
 
     def get_fixed_size(self):
-        return self.size
+        return (self.size + 7) // 8
 
     #
     # Serialization
@@ -50,7 +50,7 @@ def serialize(self, value: BytesOrByteArray) -> bytes:
     # Deserialization
     #
     def deserialize(self, data: bytes) -> bytes:
-        if len(data) >= self.size:
+        if len(data) > self.size:
             raise DeserializationError(
                 f"Cannot deserialize length {len(data)} data as bytes{self.size}"
             )

tests/sedes/test_bitvector_serializer.py

@@ -18,7 +18,7 @@
         (16, (0b1,) * 16, b'\xff\xff'),
     ),
 )
-def test_bytes_serialize_values(size, value, expected):
+def test_bitvector_serialize_values(size, value, expected):
     Foo = Bitvector(size)
     assert encode(value, Foo) == expected
     assert Foo.serialize(bytearray(value)) == expected
@@ -33,7 +33,7 @@ def test_bytes_serialize_values(size, value, expected):
         (16, b'\xff\xff', (0b1,) * 16),
     ),
 )
-def test_bytes_deserialize_values(size, value, expected):
+def test_bitvector_deserialize_values(size, value, expected):
     Foo = Bitvector(size)
     assert Foo.deserialize(value) == expected
 
@@ -44,6 +44,6 @@ def test_bytes_deserialize_values(size, value, expected):
         (16, (0b1,) + (0b0,) * 15),
     ),
 )
-def test_bytes_round_trip_no_sedes(size, value):
+def test_bitvector_round_trip_no_sedes(size, value):
     Foo = Bitvector(size)
     assert decode(encode(value, Foo), Foo) == value