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unit tests for longer encodings #23

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May 2, 2021
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unit tests for longer encodings #23

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unit tests for longer encodings
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@charlesnicholson
charlesnicholson committed May 2, 2021
commit f4cc256a44864f20056992f9d620043fc06a1f72
65 changes: 59 additions & 6 deletions tests/test_cobs_encode.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -110,18 +110,71 @@ TEST_CASE("Simple encodings", "[cobs_encode]") {
}
}

TEST_CASE("0xFF single code-block case", "[cobs_encode]") {
byte_vec_t dec(254, 0x01);
byte_vec_t enc( cobs_encode_max(static_cast< unsigned >(dec.size())) );
namespace {
byte_vec_t encode(byte_vec_t const &decoded) {
byte_vec_t enc(cobs_encode_max(static_cast< unsigned >(decoded.size())));
unsigned enc_len;
REQUIRE( cobs_encode(dec.data(),
static_cast< unsigned >(dec.size()),
REQUIRE( cobs_encode(decoded.data(),
static_cast< unsigned >(decoded.size()),
enc.data(),
static_cast< unsigned >(enc.size()),
&enc_len) == COBS_RET_SUCCESS );
return byte_vec_t(enc.begin(), enc.begin() + enc_len);
}
}

TEST_CASE("0xFF single code-block case", "[cobs_encode]") {
byte_vec_t expected(255, 0x01);
expected[0] = 0xFF;
expected.push_back(0x00);
REQUIRE ( enc == expected );
REQUIRE( encode(byte_vec_t(254, 0x01)) == expected );
}

TEST_CASE("Longer payloads", "[cobs_encode]") {
SECTION("255 non-zero bytes") {
byte_vec_t expected{0xFF};
expected.insert(std::end(expected), 254, 0x01);
expected.push_back(0x02); // code: distance to next block
expected.push_back(0x01);
expected.push_back(0x00);
REQUIRE( encode(byte_vec_t(255, 0x01)) == expected );
}

SECTION("255 zero bytes") {
byte_vec_t expected(256, 0x01);
expected.push_back(0x00);
REQUIRE( encode(byte_vec_t(255, 0x00)) == expected );
}

SECTION("1024 non-zero bytes") {
byte_vec_t expected;
for (auto i = 0u; i < 1024 / 254; ++i) {
expected.push_back(0xFF);
expected.insert(std::end(expected), 254, '!');
}
expected.push_back((1024 % 254) + 1);
expected.insert(std::end(expected), (1024 % 254), '!');
expected.push_back(0x00);
REQUIRE( encode(byte_vec_t(1024, '!')) == expected );
}

SECTION("1024 zero bytes") {
byte_vec_t expected(1025, 0x01);
expected.push_back(0x00);
REQUIRE( encode(byte_vec_t(1024, 0x00)) == expected );
}

SECTION("1024 every other byte is zero") {
byte_vec_t dec;
for (auto i = 0u; i < 1024; ++i) {
dec.push_back(i & 1);
}

byte_vec_t expected;
for (auto i = 0u; i <= 1024; ++i) {
expected.push_back((i & 1) ? 2 : 1);
}
expected.push_back(0x00);
REQUIRE( encode(dec) == expected );
}
}