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c638c57209
The StringMaker is off by default and can be enabled by a new macro `CATCH_CONFIG_ENABLE_VARIANT_STRINGMAKER`, to avoid increasing the footprint of stringification machinery by default.
85 lines
2.8 KiB
C++
85 lines
2.8 KiB
C++
#define CATCH_CONFIG_ENABLE_VARIANT_STRINGMAKER
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#include "catch.hpp"
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#if defined(CATCH_CONFIG_CPP17_VARIANT)
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#include <string>
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#include <variant>
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TEST_CASE( "variant<std::monostate>", "[toString][variant][approvals]")
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{
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using type = std::variant<std::monostate>;
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CHECK( "{ }" == ::Catch::Detail::stringify(type{}) );
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type value {};
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CHECK( "{ }" == ::Catch::Detail::stringify(value) );
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CHECK( "{ }" == ::Catch::Detail::stringify(std::get<0>(value)) );
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}
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TEST_CASE( "variant<int>", "[toString][variant][approvals]")
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{
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using type = std::variant<int>;
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CHECK( "0" == ::Catch::Detail::stringify(type{0}) );
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}
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TEST_CASE( "variant<float, int>", "[toString][variant][approvals]")
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{
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using type = std::variant<float, int>;
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CHECK( "0.5f" == ::Catch::Detail::stringify(type{0.5f}) );
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CHECK( "0" == ::Catch::Detail::stringify(type{0}) );
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SECTION("valueless by exception") {
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struct sample {
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operator int() const { throw 42; }
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};
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type value{1.5f};
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REQUIRE_THROWS_AS( value.emplace<int>(sample{}), int );
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REQUIRE( value.valueless_by_exception() );
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CHECK( "{valueless variant}" == ::Catch::Detail::stringify(value) );
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}
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}
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TEST_CASE( "variant<string, int>", "[toString][variant][approvals]")
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{
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using type = std::variant<std::string, int>;
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CHECK( "\"foo\"" == ::Catch::Detail::stringify(type{"foo"}) );
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CHECK( "0" == ::Catch::Detail::stringify(type{0}) );
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}
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TEST_CASE( "variant<variant<float, int>, string>", "[toString][variant][approvals]")
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{
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using inner = std::variant<float, int>;
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using type = std::variant<inner, std::string>;
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CHECK( "0.5f" == ::Catch::Detail::stringify(type{0.5f}) );
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CHECK( "0" == ::Catch::Detail::stringify(type{0}) );
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CHECK( "\"foo\"" == ::Catch::Detail::stringify(type{"foo"}) );
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struct sample {
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operator int() const { throw 42; }
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};
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SECTION("valueless nested variant") {
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type value = inner{0.5f};
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REQUIRE( std::holds_alternative<inner>(value) );
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REQUIRE( std::holds_alternative<float>(std::get<inner>(value)) );
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REQUIRE_THROWS_AS( std::get<0>(value).emplace<int>(sample{}), int );
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// outer variant is still valid and contains inner
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REQUIRE( std::holds_alternative<inner>(value) );
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// inner variant is valueless
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REQUIRE( std::get<inner>(value).valueless_by_exception() );
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CHECK( "{valueless variant}" == ::Catch::Detail::stringify(value) );
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}
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}
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TEST_CASE( "variant<nullptr,int,const char *>", "[toString][variant][approvals]" )
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{
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using type = std::variant<std::nullptr_t,int,const char *>;
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CHECK( "nullptr" == ::Catch::Detail::stringify(type{nullptr}) );
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CHECK( "42" == ::Catch::Detail::stringify(type{42}) );
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CHECK( "\"Catch me\"" == ::Catch::Detail::stringify(type{"Catch me"}) );
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}
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#endif // CATCH_INTERNAL_CONFIG_CPP17_VARIANT
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