Quelle  test_bigint.cxx   Sprache: C

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#include <cppunit/TestFixture.h>
#include <cppunit/extensions/HelperMacros.h>

#include <tools/bigint.hxx>

#include <limits>

namespace tools
{
class BigIntTest : public CppUnit::TestFixture
{
public:
    void testConstructionFromLongLong();
    void testLenB1();

    CPPUNIT_TEST_SUITE(BigIntTest);
    CPPUNIT_TEST(testConstructionFromLongLong);
    CPPUNIT_TEST(testLenB1);
    CPPUNIT_TEST_SUITE_END();
};

void BigIntTest::testConstructionFromLongLong()
{
    // small positive number
    {
        BigInt bi(static_cast<sal_Int64>(42));
        CPPUNIT_ASSERT(!bi.IsZero());
        CPPUNIT_ASSERT(!bi.IsNeg());
        CPPUNIT_ASSERT(!bi.IsBig());
        CPPUNIT_ASSERT_EQUAL(static_cast<sal_Int32>(42), static_cast<sal_Int32>(bi));
    }

    // small negative number
    {
        BigInt bi(static_cast<sal_Int64>(-42));
        CPPUNIT_ASSERT(!bi.IsZero());
        CPPUNIT_ASSERT(bi.IsNeg());
        CPPUNIT_ASSERT(!bi.IsBig());
        CPPUNIT_ASSERT_EQUAL(static_cast<sal_Int32>(-42), static_cast<sal_Int32>(bi));
    }

    // positive number just fitting to sal_Int32
    {
        BigInt bi(static_cast<sal_Int64>(std::numeric_limits<sal_Int32>::max()));
        CPPUNIT_ASSERT(!bi.IsZero());
        CPPUNIT_ASSERT(!bi.IsNeg());
        CPPUNIT_ASSERT(!bi.IsBig());
        CPPUNIT_ASSERT_EQUAL(std::numeric_limits<sal_Int32>::max(), static_cast<sal_Int32>(bi));
    }

    // negative number just fitting to sal_Int32
    {
        BigInt bi(static_cast<sal_Int64>(std::numeric_limits<sal_Int32>::min()));
        CPPUNIT_ASSERT(!bi.IsZero());
        CPPUNIT_ASSERT(bi.IsNeg());
        CPPUNIT_ASSERT(!bi.IsBig());
        CPPUNIT_ASSERT_EQUAL(std::numeric_limits<sal_Int32>::min(), static_cast<sal_Int32>(bi));
    }

    // positive number not fitting to sal_Int32
    {
        BigInt bi(static_cast<sal_Int64>(std::numeric_limits<sal_Int32>::max()) + 1);
        CPPUNIT_ASSERT(!bi.IsZero());
        CPPUNIT_ASSERT(!bi.IsNeg());
        CPPUNIT_ASSERT(bi.IsBig());
    }

    // negative number not fitting to sal_Int32
    {
        BigInt bi(static_cast<sal_Int64>(std::numeric_limits<sal_Int32>::min()) - 1);
        CPPUNIT_ASSERT(!bi.IsZero());
        CPPUNIT_ASSERT(bi.IsNeg());
        CPPUNIT_ASSERT(bi.IsBig());
    }

    // max possible sal_Int64 negative number
    {
        BigInt bi(static_cast<sal_Int64>(std::numeric_limits<sal_Int64>::min()));
        CPPUNIT_ASSERT(!bi.IsZero());
        CPPUNIT_ASSERT(bi.IsNeg());
        CPPUNIT_ASSERT(bi.IsBig());
        CPPUNIT_ASSERT_EQUAL(std::numeric_limits<sal_Int64>::min(), static_cast<sal_Int64>(bi));
    }

    // max possible sal_Int64 positive number
    {
        BigInt bi(static_cast<sal_Int64>(std::numeric_limits<sal_Int64>::max()));
        CPPUNIT_ASSERT(!bi.IsZero());
        CPPUNIT_ASSERT(!bi.IsNeg());
        CPPUNIT_ASSERT(bi.IsBig());
        CPPUNIT_ASSERT_EQUAL(std::numeric_limits<sal_Int64>::max(), static_cast<sal_Int64>(bi));
    }
}

void BigIntTest::testLenB1()
{
    BigInt dy(2634022912);
    sal_Int64 md(-4177526784);
    sal_Int64 mn(2634022912);
    dy *= md;
    dy -= (mn - 1) / 2;
    dy /= mn;

    CPPUNIT_ASSERT_EQUAL(sal_Int64(-4177526784), sal_Int64(dy));
}

CPPUNIT_TEST_SUITE_REGISTRATION(BigIntTest);
}

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