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modbus_test_utils.cpp

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modbus_test_utils.cpp

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#include <gtest/gtest.h>
#include "modbus_test_utils.h"
#include "../src/modbus_request.h"
namespace testutils
{
void AssertPayloadError(const std::vector<uint8_t>* payload, modb::ResponseError expectedError)
{
ASSERT_NE(payload, nullptr);
ASSERT_EQ(payload->size(), 3);
ASSERT_EQ((*payload)[1] & modb::ERROR_FLAG, modb::ERROR_FLAG);
ASSERT_EQ((*payload)[2], static_cast<uint8_t>(expectedError));
}
bool IsEqualString(uint16_t* reg, const std::string& text)
{
return std::memcmp(reg, text.c_str(), text.length()) == 0;
}
bool IsEqualString(uint8_t* buf, const std::string& text)
{
return std::memcmp(buf, text.c_str(), text.length()) == 0;
}
bool IsEqualUint16(uint8_t* bufBigEndian, uint16_t valueLittleEndian)
{
// convert to little-endian
uint16_t bufValue = *(bufBigEndian + 1) + (*(bufBigEndian + 0) << 8);
return bufValue == valueLittleEndian;
}
// Use other conversion method for test
float ToFloatLittleEndian(uint16_t* reg)
{
// Note: cannot direct cast to float => wrong result!!
uint32_t tempUint32 = __builtin_bswap32(*(uint32_t*)reg);
return *(reinterpret_cast<float*>(&tempUint32));
}
} // namespace testutils
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