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Tests: Add a test to codify BitStream behavior beyond stream limits

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Tim Schumacher 2023-11-11 13:21:51 +01:00 • committed by Andreas Kling
parent de49413bdf
commit 270b1176de
1 changed files with 47 additions and 0 deletions
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47
Tests/AK/TestBitStream.cpp
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@ -132,6 +132,53 @@ TEST_CASE(big_endian_bit_stream_input_output_match)
} }
} }
TEST_CASE(bit_reads_beyond_stream_limits)
{
Array<u8, 1> const test_data { 0xFF };
{
// LittleEndianInputBitStream allows reading null bits beyond the original data
// for compatibility purposes.
auto memory_stream = make<FixedMemoryStream>(test_data);
auto bit_stream = make<LittleEndianInputBitStream>(move(memory_stream));
{
auto result = TRY_OR_FAIL(bit_stream->read_bits<u8>(6));
EXPECT_EQ(result, 0b111111);
}
{
auto result = TRY_OR_FAIL(bit_stream->read_bits<u8>(6));
EXPECT_EQ(result, 0b000011);
}
{
auto result = TRY_OR_FAIL(bit_stream->read_bits<u8>(6));
EXPECT_EQ(result, 0b000000);
}
}
{
auto memory_stream = make<FixedMemoryStream>(test_data);
auto bit_stream = make<BigEndianInputBitStream>(move(memory_stream));
{
auto result = TRY_OR_FAIL(bit_stream->read_bits<u8>(6));
EXPECT_EQ(result, 0b111111);
}
{
auto result = bit_stream->read_bits<u8>(6);
EXPECT(result.is_error());
}
{
auto result = bit_stream->read_bits<u8>(6);
EXPECT(result.is_error());
}
}
}
RANDOMIZED_TEST_CASE(roundtrip_u8_little_endian) RANDOMIZED_TEST_CASE(roundtrip_u8_little_endian)
{ {
GEN(n, Gen::unsigned_int(NumericLimits<u8>::max())); GEN(n, Gen::unsigned_int(NumericLimits<u8>::max()));