virtualx-engine/tests/test_marshalls.h

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/*  test_marshalls.h                                                     */
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#ifndef TEST_MARSHALLS_H
#define TEST_MARSHALLS_H

#include "core/io/marshalls.h"

#include "tests/test_macros.h"

namespace TestMarshalls {

TEST_CASE("[Marshalls] Unsigned 16 bit integer encoding") {
	uint8_t arr[2];

	unsigned int actual_size = encode_uint16(0x1234, arr);
	CHECK(actual_size == sizeof(uint16_t));
	CHECK_MESSAGE(arr[0] == 0x34, "First encoded byte value should be equal to low order byte value.");
	CHECK_MESSAGE(arr[1] == 0x12, "Last encoded byte value should be equal to high order byte value.");
}

TEST_CASE("[Marshalls] Unsigned 32 bit integer encoding") {
	uint8_t arr[4];

	unsigned int actual_size = encode_uint32(0x12345678, arr);
	CHECK(actual_size == sizeof(uint32_t));
	CHECK_MESSAGE(arr[0] == 0x78, "First encoded byte value should be equal to low order byte value.");
	CHECK(arr[1] == 0x56);
	CHECK(arr[2] == 0x34);
	CHECK_MESSAGE(arr[3] == 0x12, "Last encoded byte value should be equal to high order byte value.");
}

TEST_CASE("[Marshalls] Unsigned 64 bit integer encoding") {
	uint8_t arr[8];

	unsigned int actual_size = encode_uint64(0x0f123456789abcdef, arr);
	CHECK(actual_size == sizeof(uint64_t));
	CHECK_MESSAGE(arr[0] == 0xef, "First encoded byte value should be equal to low order byte value.");
	CHECK(arr[1] == 0xcd);
	CHECK(arr[2] == 0xab);
	CHECK(arr[3] == 0x89);
	CHECK(arr[4] == 0x67);
	CHECK(arr[5] == 0x45);
	CHECK(arr[6] == 0x23);
	CHECK_MESSAGE(arr[7] == 0xf1, "Last encoded byte value should be equal to high order byte value.");
}

TEST_CASE("[Marshalls] Unsigned 16 bit integer decoding") {
	uint8_t arr[] = { 0x34, 0x12 };

	CHECK(decode_uint16(arr) == 0x1234);
}

TEST_CASE("[Marshalls] Unsigned 32 bit integer decoding") {
	uint8_t arr[] = { 0x78, 0x56, 0x34, 0x12 };

	CHECK(decode_uint32(arr) == 0x12345678);
}

TEST_CASE("[Marshalls] Unsigned 64 bit integer decoding") {
	uint8_t arr[] = { 0xef, 0xcd, 0xab, 0x89, 0x67, 0x45, 0x23, 0xf1 };

	CHECK(decode_uint64(arr) == 0x0f123456789abcdef);
}

TEST_CASE("[Marshalls] Floating point single precision encoding") {
	uint8_t arr[4];

	// Decimal: 0.15625
	// IEEE 754 single-precision binary floating-point format:
	// sign exponent (8 bits)    fraction (23 bits)
	//  0       01111100      01000000000000000000000
	// Hexadecimal: 0x3E200000
	unsigned int actual_size = encode_float(0.15625f, arr);
	CHECK(actual_size == sizeof(uint32_t));
	CHECK(arr[0] == 0x00);
	CHECK(arr[1] == 0x00);
	CHECK(arr[2] == 0x20);
	CHECK(arr[3] == 0x3e);
}

TEST_CASE("[Marshalls] Floating point double precision encoding") {
	uint8_t arr[8];

	// Decimal: 0.333333333333333314829616256247390992939472198486328125
	// IEEE 754 double-precision binary floating-point format:
	// sign exponent (11 bits)                  fraction (52 bits)
	//  0      01111111101     0101010101010101010101010101010101010101010101010101
	// Hexadecimal: 0x3FD5555555555555
	unsigned int actual_size = encode_double(0.33333333333333333, arr);
	CHECK(actual_size == sizeof(uint64_t));
	CHECK(arr[0] == 0x55);
	CHECK(arr[1] == 0x55);
	CHECK(arr[2] == 0x55);
	CHECK(arr[3] == 0x55);
	CHECK(arr[4] == 0x55);
	CHECK(arr[5] == 0x55);
	CHECK(arr[6] == 0xd5);
	CHECK(arr[7] == 0x3f);
}

TEST_CASE("[Marshalls] Floating point single precision decoding") {
	uint8_t arr[] = { 0x00, 0x00, 0x20, 0x3e };

	// See floating point encoding test case for details behind expected values
	CHECK(decode_float(arr) == 0.15625f);
}

TEST_CASE("[Marshalls] Floating point double precision decoding") {
	uint8_t arr[] = { 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0xd5, 0x3f };

	// See floating point encoding test case for details behind expected values
	CHECK(decode_double(arr) == 0.33333333333333333);
}

TEST_CASE("[Marshalls] C string encoding") {
	char cstring[] = "Godot"; // 5 characters
	uint8_t data[6];

	int actual_size = encode_cstring(cstring, data);
	CHECK(actual_size == 6);
	CHECK(data[0] == 'G');
	CHECK(data[1] == 'o');
	CHECK(data[2] == 'd');
	CHECK(data[3] == 'o');
	CHECK(data[4] == 't');
	CHECK(data[5] == '\0');
}
} // namespace TestMarshalls

#endif // TEST_MARSHALLS_H