eithertest.cpp

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 **********************************************************************/
 
#include "eithertest.h"
#include <QtTest>
#include <either.h>
#include <curry.h>
#include <void.h>
#include <functor.h>
#include <monad.h>
 
QTEST_MAIN (LC::Util::EitherTest)
 
namespace LC
{
namespace Util
{
    using SomeEither_t = Either<int, QString>;
 
    void EitherTest::testBasicLeft ()
    {
        const auto& left = SomeEither_t::Left (1);
        QCOMPARE (left.IsLeft (), true);
        QCOMPARE (left.IsRight (), false);
        QCOMPARE (left.GetLeft (), 1);
 
        bool hadCaught = false;
        try
        {
            left.GetRight ();
        }
        catch (const std::exception&)
        {
            hadCaught = true;
        }
        QCOMPARE (hadCaught, true);
    }
 
    void EitherTest::testBasicRight ()
    {
        const auto& right = SomeEither_t::Right ("foo");
        QCOMPARE (right.IsLeft (), false);
        QCOMPARE (right.IsRight (), true);
        QCOMPARE (right.GetRight (), QString { "foo" });
 
        bool hadCaught = false;
        try
        {
            right.GetLeft ();
        }
        catch (const std::exception&)
        {
            hadCaught = true;
        }
        QCOMPARE (hadCaught, true);
    }
 
    void EitherTest::testFMapLeft ()
    {
        const auto& left = SomeEither_t::Left (1);
        const auto& fmapped = Fmap (left, [] (const QString& str) { return str + "_mapped"; });
        QCOMPARE (fmapped, left);
    }
 
    void EitherTest::testFMapRight ()
    {
        const auto& right = SomeEither_t::Right ("foo");
        const auto& fmapped = Fmap (right, [] (const QString& str) { return str + "_mapped"; });
        QCOMPARE (fmapped.GetRight (), QString { "foo_mapped" });
    }
 
    void EitherTest::testFMapRightChangeType ()
    {
        const auto& right = SomeEither_t::Right ("foo");
        const auto& fmapped = Fmap (right, [] (const QString& str) { return static_cast<long> (str.size ()); });
        QCOMPARE (fmapped.GetRight (), static_cast<long> (right.GetRight ().size ()));
    }
 
    void EitherTest::testPure ()
    {
        const auto& pure = Pure<Either, int> (QString { "foo" });
        QCOMPARE (pure, SomeEither_t::Right ("foo"));
    }
 
    void EitherTest::testGSL ()
    {
        const auto& pure = Pure<Either, int> ([] (const QString& s) { return s + "_pure"; });
        const auto& app = pure * Pure<Either, int> (QString { "foo" });
        QCOMPARE (app, SomeEither_t::Right ("foo_pure"));
    }
 
    void EitherTest::testGSLLeft ()
    {
        const auto& pure = Pure<Either, int> ([] (const QString& s) { return s + "_pure"; });
        const auto& value = SomeEither_t::Left (2);
        const auto& app = pure * value;
        QCOMPARE (app, value);
    }
 
    void EitherTest::testGSLCurry ()
    {
        const auto& summer = Pure<Either, int> (Curry ([] (const QString& a, const QString& b) { return a + b; }));
        const auto& s1 = Pure<Either, int> (QString { "foo" });
        const auto& s2 = Pure<Either, int> (QString { "bar" });
        const auto& app = summer * s1 * s2;
        QCOMPARE (app, SomeEither_t::Right ("foobar"));
    }
 
    void EitherTest::testGSLCurryLeft ()
    {
        const auto& summer = Pure<Either, int> (Curry ([] (const QString& a, const QString& b) { return a + b; }));
        const auto& s1 = SomeEither_t::Left (2);
        const auto& s2 = Pure<Either, int> (QString { "bar" });
        const auto& app = summer * s1 * s2;
        QCOMPARE (app, s1);
    }
 
    void EitherTest::testBind ()
    {
        const auto& res = Return<Either, int> (QString { "foo" }) >>
                [] (const QString& right) { return SomeEither_t::Right (right + "_bound"); };
        QCOMPARE (res, SomeEither_t::Right ("foo_bound"));
    }
 
    void EitherTest::testBindLeft ()
    {
        const auto& value = SomeEither_t::Left (2);
        const auto& res = value >>
                [] (const QString& right) { return SomeEither_t::Right (right + "_bound"); };
        QCOMPARE (res, value);
    }
 
    struct NoDefaultCtor
    {
        NoDefaultCtor () = delete;
        NoDefaultCtor (const QString&)
        {
        }
 
        bool operator== (const NoDefaultCtor&) const
        {
            return true;
        }
    };
 
    void EitherTest::testBindLeftNotConstructed ()
    {
        const auto& value = Either<NoDefaultCtor, Void>::Right ({});
        const auto& expected = Either<NoDefaultCtor, int>::Right (5);
        const auto res = value >>
                [&expected] (const auto&) { return expected; };
        QCOMPARE (res, expected);
    }
}
}