Quelle  test_fract.cxx   Sprache: C

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

#include <rtl/math.hxx>
#include <tools/fract.hxx>

namespace tools
{

class FractionTest : public CppUnit::TestFixture
{
public:

    void testFraction()
    {
        const Fraction aFract(1082130431,1073741824);
        CPPUNIT_ASSERT_MESSAGE( "Fraction #1 not approximately equal to 1.007812499068677",
                                rtl::math::approxEqual(static_cast<double>(aFract),1.007812499068677) );

        Fraction aFract2( aFract );
        aFract2.ReduceInaccurate(8);
        CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #2 not 1",
                                sal_Int32(1), aFract2.GetNumerator() );
        CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #2 not 1",
                                sal_Int32(1), aFract2.GetDenominator() );

        Fraction aFract3( 0x7AAAAAAA, 0x35555555 );
        CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 cancellation wrong",
                                sal_Int32(0x7AAAAAAA), aFract3.GetNumerator() );
        CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 cancellation wrong",
                                sal_Int32(0x35555555), aFract3.GetDenominator() );
        aFract3.ReduceInaccurate(30);
        CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 ReduceInaccurate erroneously cut precision",
                                sal_Int32(0x7AAAAAAA), aFract3.GetNumerator() );
        CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 ReduceInaccurate erroneously cut precision",
                                sal_Int32(0x35555555), aFract3.GetDenominator() );

        aFract3.ReduceInaccurate(29);
        CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 reduce to 29 bits failed",
                                sal_Int32(0x3D555555), aFract3.GetNumerator() );
        CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 reduce to 29 bits failed",
                                sal_Int32(0x1AAAAAAA), aFract3.GetDenominator() );

        aFract3.ReduceInaccurate(9);
        CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 reduce to 9 bits failed",
                                sal_Int32(0x0147), aFract3.GetNumerator() );
        CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 reduce to 9 bits failed",
                                sal_Int32(0x008E), aFract3.GetDenominator() );

        aFract3.ReduceInaccurate(1);
        CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 reduce to 1 bit failed",
                                sal_Int32(2), aFract3.GetNumerator() );
        CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 reduce to 1 bit failed",
                                sal_Int32(1), aFract3.GetDenominator() );

        aFract3.ReduceInaccurate(0);
        CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 reduce to 0 bits failed",
                                sal_Int32(2), aFract3.GetNumerator() );
        CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 reduce to 0 bits failed",
                                sal_Int32(1), aFract3.GetDenominator() );

    }

    void testMinLongDouble() {
        Fraction f(double(SAL_MIN_INT32));
        CPPUNIT_ASSERT_EQUAL(SAL_MIN_INT32, f.GetNumerator());
        CPPUNIT_ASSERT_EQUAL(sal_Int32(1), f.GetDenominator());
    }

    void testCreateFromDoubleIn32BitsPlatform() {
        // This pass in 64 bits but fail in 32 bits
        Fraction f(0.960945);
        CPPUNIT_ASSERT_EQUAL(true, f.IsValid());
    }

    CPPUNIT_TEST_SUITE(FractionTest);
    CPPUNIT_TEST(testFraction);
    CPPUNIT_TEST(testMinLongDouble);
    CPPUNIT_TEST(testCreateFromDoubleIn32BitsPlatform);
    CPPUNIT_TEST_SUITE_END();
};


CPPUNIT_TEST_SUITE_REGISTRATION(FractionTest);
} // namespace tools

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