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"""
Test for the integer encoding/decoding functionality in the HPACK library.
"""
import
pytest
from
hypothesis
import
given
from
hypothesis
.
strategies
import
integers
,
binary
,
one_of
from
hpack
import
HPACKDecodingError
from
hpack
.
hpack
import
encode_integer
,
decode_integer
class
TestIntegerEncoding
:
# These tests are stolen from the HPACK spec.
def
test_encoding_10_with_5_bit_prefix
(
self
):
val
=
encode_integer
(
10
,
5
)
assert
len
(
val
)
==
1
assert
val
==
bytearray
(
b'
\x0a
'
)
def
test_encoding_1337_with_5_bit_prefix
(
self
):
val
=
encode_integer
(
1337
,
5
)
assert
len
(
val
)
==
3
assert
val
==
bytearray
(
b'
\x1f
\x9a
\x0a
'
)
def
test_encoding_42_with_8_bit_prefix
(
self
):
val
=
encode_integer
(
42
,
8
)
assert
len
(
val
)
==
1
assert
val
==
bytearray
(
b'
\x2a
'
)
class
TestIntegerDecoding
:
# These tests are stolen from the HPACK spec.
def
test_decoding_10_with_5_bit_prefix
(
self
):
val
=
decode_integer
(
b'
\x0a
'
,
5
)
assert
val
==
(
10
,
1
)
def
test_encoding_1337_with_5_bit_prefix
(
self
):
val
=
decode_integer
(
b'
\x1f
\x9a
\x0a
'
,
5
)
assert
val
==
(
1337
,
3
)
def
test_encoding_42_with_8_bit_prefix
(
self
):
val
=
decode_integer
(
b'
\x2a
'
,
8
)
assert
val
==
(
42
,
1
)
def
test_decode_empty_string_fails
(
self
):
with
pytest
.
raises
(
HPACKDecodingError
):
decode_integer
(
b''
,
8
)
def
test_decode_insufficient_data_fails
(
self
):
with
pytest
.
raises
(
HPACKDecodingError
):
decode_integer
(
b'
\x1f
'
,
5
)
class
TestEncodingProperties
:
"""
Property-based tests for our integer encoder and decoder.
"""
@
given
(
integer
=
integers
(
min_value
=
0
),
prefix_bits
=
integers
(
min_value
=
1
,
max_value
=
8
)
)
def
test_encode_positive_integer_always_valid
(
self
,
integer
,
prefix_bits
):
"""
So long as the prefix bits are between 1 and 8, any positive integer
can be represented.
"""
result
=
encode_integer
(
integer
,
prefix_bits
)
assert
isinstance
(
result
,
bytearray
)
assert
len
(
result
)
>
0
@
given
(
integer
=
integers
(
max_value
=
-
1
),
prefix_bits
=
integers
(
min_value
=
1
,
max_value
=
8
)
)
def
test_encode_fails_for_negative_integers
(
self
,
integer
,
prefix_bits
):
"""
If the integer to encode is negative, the encoder fails.
"""
with
pytest
.
raises
(
ValueError
):
encode_integer
(
integer
,
prefix_bits
)
@
given
(
integer
=
integers
(
min_value
=
0
),
prefix_bits
=
one_of
(
integers
(
max_value
=
0
),
integers
(
min_value
=
9
)
)
)
def
test_encode_fails_for_invalid_prefixes
(
self
,
integer
,
prefix_bits
):
"""
If the prefix is out of the range [1,8], the encoder fails.
"""
with
pytest
.
raises
(
ValueError
):
encode_integer
(
integer
,
prefix_bits
)
@
given
(
prefix_bits
=
one_of
(
integers
(
max_value
=
0
),
integers
(
min_value
=
9
)
)
)
def
test_decode_fails_for_invalid_prefixes
(
self
,
prefix_bits
):
"""
If the prefix is out of the range [1,8], the encoder fails.
"""
with
pytest
.
raises
(
ValueError
):
decode_integer
(
b'
\x00
'
,
prefix_bits
)
@
given
(
data
=
binary
(),
prefix_bits
=
integers
(
min_value
=
1
,
max_value
=
8
)
)
def
test_decode_either_succeeds_or_raises_error
(
self
,
data
,
prefix_bits
):
"""
Attempting to decode data either returns a positive integer or throws a
HPACKDecodingError.
"""
try
:
result
,
consumed
=
decode_integer
(
data
,
prefix_bits
)
except
HPACKDecodingError
:
pass
else
:
assert
isinstance
(
result
,
int
)
assert
result
>=
0
assert
consumed
>
0
@
given
(
integer
=
integers
(
min_value
=
0
,
max_value
=
2
**
32
),
prefix_bits
=
integers
(
min_value
=
1
,
max_value
=
8
)
)
def
test_encode_decode_round_trips
(
self
,
integer
,
prefix_bits
):
"""
Given valid data, the encoder and decoder can round trip.
"""
encoded_result
=
encode_integer
(
integer
,
prefix_bits
)
decoded_integer
,
consumed
=
decode_integer
(
bytes
(
encoded_result
),
prefix_bits
)
assert
integer
==
decoded_integer
assert
consumed
>
0
def
test_decode_too_long_fails
(
self
):
"""
If the variable integer representation is too long, the decoder fails.
"""
with
pytest
.
raises
(
HPACKDecodingError
):
decode_integer
(
b'
\xff
\xff
\xff
\xff
\xff
\xff
'
,
5
)
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