Ichthyostega
4348e110cb
on second thought, the ability to transport an exception still seems worthwhile, and can be achieved by some rearrangements in the design. As preparation, reorganise the design of the Either-wrapper (lib::Result)
108 lines
3.1 KiB
C++
108 lines
3.1 KiB
C++
/*
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Result(Test) - verify the either-result-or-failure intermediary wrapper
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Copyright (C) Lumiera.org
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2023, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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/** @file result-test.cpp
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** unit test \ref Result_test
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*/
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#include "lib/test/run.hpp"
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#include "lib/test/test-helper.hpp"
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#include "lib/result.hpp"
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#include "lib/util.hpp"
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#include <cstdlib>
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namespace lib {
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namespace test{
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using util::isSameObject;
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using std::rand;
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namespace error = lumiera::error;
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using error::LUMIERA_ERROR_FATAL;
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using error::LUMIERA_ERROR_STATE; ///////////////////TODO
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namespace {
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const Literal THE_END = "all dead and hero got the girl";
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#define Type(_EXPR_) lib::test::showType<decltype(_EXPR_)>()
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}
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/***********************************************************************************//**
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* @test Verify an intermediary »Either« type, to embody either a successful result,
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* or document a failure with encountered exception.
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* @see result.hpp
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* @see lib::ThreadJoinable usage example
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*/
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class Result_test
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: public Test
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{
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void
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run (Arg)
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{
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auto happy = Result{THE_END};
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CHECK (happy == THE_END);
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CHECK (happy.isValid());
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CHECK (true == happy);
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happy.maybeThrow(); // still alive...
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CHECK (Type(happy) == "Result<Literal const&>"_expect);
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// Note type deduction: RValue moved into the Result...
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auto sequel = Result{Literal{THE_END}};
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CHECK (sequel.isValid());
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CHECK (Type(sequel) == "Result<Literal>"_expect);
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CHECK ( isSameObject (happy.get<Literal const&>(), THE_END));
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CHECK (not isSameObject (sequel.get<Literal const&>(), THE_END));
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// »Either Right« case : mark as failure
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Result<double> facepalm{error::Fatal()};
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CHECK (not facepalm.isValid());
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VERIFY_ERROR (STATE, (double)facepalm );
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VERIFY_ERROR (STATE, facepalm.get<double&>());
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VERIFY_ERROR (STATE, facepalm.maybeThrow() );
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CHECK (42.0 == facepalm.getOrElse([]{ return 42; }));
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}
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};
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/** Register this test class... */
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LAUNCHER (Result_test, "unit common");
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}} // namespace lib::test
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