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◆ main openmsx / src / unittest / narrow_test.cc
2.7 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#include "catch.hpp"
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#include "narrow.hh"
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#include <cstdint>
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#include <type_traits>
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template<typename From, typename To>
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bool test_narrow(From from, To expected)
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{
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	// When compiling unittests this will throw on error.
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	// But for normal builds it triggers an assertion.
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	auto result = narrow<To>(from);
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	static_assert(std::is_same_v<decltype(result), To>);
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	CHECK(result == expected);
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	return true;
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}
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TEST_CASE("narrow")
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{
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	int ERR = 0;
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	SECTION("int32_t -> uint8_t") {
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		CHECK_NOTHROW(test_narrow(int32_t(   0), uint8_t(  0)));
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		CHECK_NOTHROW(test_narrow(int32_t( 100), uint8_t(100)));
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		CHECK_NOTHROW(test_narrow(int32_t( 200), uint8_t(200)));
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		CHECK_NOTHROW(test_narrow(int32_t( 255), uint8_t(255)));
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		CHECK_THROWS (test_narrow(int32_t(-999), uint8_t(ERR)));
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		CHECK_THROWS (test_narrow(int32_t(-256), uint8_t(ERR)));
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		CHECK_THROWS (test_narrow(int32_t(-255), uint8_t(ERR)));
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		CHECK_THROWS (test_narrow(int32_t(  -1), uint8_t(ERR)));
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		CHECK_THROWS (test_narrow(int32_t( 256), uint8_t(ERR)));
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		CHECK_THROWS (test_narrow(int32_t( 300), uint8_t(ERR)));
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		CHECK_THROWS (test_narrow(int32_t(9999), uint8_t(ERR)));
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	}
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	SECTION("int32_t -> int8_t") {
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		CHECK_NOTHROW(test_narrow(int32_t(-128), int8_t(-128)));
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		CHECK_NOTHROW(test_narrow(int32_t( -32), int8_t( -32)));
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		CHECK_NOTHROW(test_narrow(int32_t(   0), int8_t(   0)));
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		CHECK_NOTHROW(test_narrow(int32_t(   7), int8_t(   7)));
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		CHECK_NOTHROW(test_narrow(int32_t( 100), int8_t( 100)));
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		CHECK_NOTHROW(test_narrow(int32_t( 127), int8_t( 127)));
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		CHECK_THROWS (test_narrow(int32_t(-999), int8_t(ERR)));
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		CHECK_THROWS (test_narrow(int32_t(-456), int8_t(ERR)));
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		CHECK_THROWS (test_narrow(int32_t(-129), int8_t(ERR)));
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		CHECK_THROWS (test_narrow(int32_t( 128), int8_t(ERR)));
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		CHECK_THROWS (test_narrow(int32_t( 356), int8_t(ERR)));
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		CHECK_THROWS (test_narrow(int32_t(9999), int8_t(ERR)));
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	}
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	SECTION("uint32_t -> uint8_t") {
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		CHECK_NOTHROW(test_narrow(uint32_t(   0), uint8_t(  0)));
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		CHECK_NOTHROW(test_narrow(uint32_t( 100), uint8_t(100)));
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		CHECK_NOTHROW(test_narrow(uint32_t( 200), uint8_t(200)));
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		CHECK_NOTHROW(test_narrow(uint32_t( 255), uint8_t(255)));
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		CHECK_THROWS (test_narrow(uint32_t( 256), uint8_t(ERR)));
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		CHECK_THROWS (test_narrow(uint32_t( 300), uint8_t(ERR)));
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		CHECK_THROWS (test_narrow(uint32_t(9999), uint8_t(ERR)));
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	}
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	SECTION("uint32_t -> int8_t") {
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		CHECK_NOTHROW(test_narrow(uint32_t(   0), int8_t(   0)));
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		CHECK_NOTHROW(test_narrow(uint32_t(   7), int8_t(   7)));
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		CHECK_NOTHROW(test_narrow(uint32_t( 100), int8_t( 100)));
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		CHECK_NOTHROW(test_narrow(uint32_t( 127), int8_t( 127)));
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		CHECK_THROWS (test_narrow(uint32_t( 128), int8_t(ERR)));
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		CHECK_THROWS (test_narrow(uint32_t( 356), int8_t(ERR)));
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		CHECK_THROWS (test_narrow(uint32_t(9999), int8_t(ERR)));
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	}
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}