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maybe-result-cpp/tests/result_map_tests.cpp

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#include "catch.hpp"
#include <maybe/result.hpp>
class A final {
public:
A(std::string value) : value(value)
{
}
std::string value;
};
class B final {
public:
B(std::string value) : value(value)
{
}
std::string value;
};
using maybe::result;
TEST_CASE("result_map")
{
SECTION("converts result A to result B")
{
auto a = result<A, int>::ok(A("hello"));
auto b = a.map([](A v) { return B(v.value + " world"); });
REQUIRE(b);
REQUIRE(b.ok_value().value == "hello world");
}
SECTION("converts result void to result B")
{
auto a = result<void, int>::ok();
auto b = a.map([]() { return B("Void world"); });
REQUIRE(b);
REQUIRE(b.ok_value().value == "Void world");
}
SECTION("does not convert result A to result B if value was error")
{
auto a = result<A, int>::err(43);
auto b = a.map([](A v) { return B(v.value = " world"); });
REQUIRE(!b);
REQUIRE(43 == b.err_value());
}
SECTION("does not convert result A to result void if value was error")
{
auto a = result<A, int>::err(43);
auto b = a.map_void();
REQUIRE(!b);
REQUIRE(43 == b.err_value());
}
SECTION("replaces result A with result B")
{
auto a = result<A, int>::ok(A("hello"));
auto b = a.map_value(B("bye"));
REQUIRE(b);
REQUIRE(b.ok_value().value == "bye");
}
SECTION("does not replace result A with result B if A is err")
{
auto a = result<A, int>::err(43);
auto b = a.map_value(B("bye"));
REQUIRE(!b);
REQUIRE(43 == b.err_value());
}
}