tools/qa/cppunit/test_fract.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
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   9  * This file incorporates work covered by the following license notice:
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  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <sal/types.h>
  21 #include <cppunit/TestFixture.h>
  22 #include <cppunit/extensions/HelperMacros.h>
  23
  24 #include <rtl/math.hxx>
  25 #include <tools/fract.hxx>
  26
  27 namespace tools
  28 {
  29
  30 class FractionTest : public CppUnit::TestFixture
  31 {
  32 public:
  33
  34     void testFraction()
  35     {
  36         const Fraction aFract(1082130431,1073741824);
  37         CPPUNIT_ASSERT_MESSAGE( "Fraction #1 not approximately equal to 1.007812499068677",
  38                                 rtl::math::approxEqual(static_cast<double>(aFract),1.007812499068677) );
  39
  40         Fraction aFract2( aFract );
  41         aFract2.ReduceInaccurate(8);
  42         CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #2 not 1",
  43                                 sal_Int32(1), aFract2.GetNumerator() );
  44         CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #2 not 1",
  45                                 sal_Int32(1), aFract2.GetDenominator() );
  46
  47         Fraction aFract3( 0x7AAAAAAA, 0x35555555 );
  48         CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 cancellation wrong",
  49                                 sal_Int32(0x7AAAAAAA), aFract3.GetNumerator() );
  50         CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 cancellation wrong",
  51                                 sal_Int32(0x35555555), aFract3.GetDenominator() );
  52         aFract3.ReduceInaccurate(30);
  53         CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 ReduceInaccurate erroneously cut precision",
  54                                 sal_Int32(0x7AAAAAAA), aFract3.GetNumerator() );
  55         CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 ReduceInaccurate erroneously cut precision",
  56                                 sal_Int32(0x35555555), aFract3.GetDenominator() );
  57
  58         aFract3.ReduceInaccurate(29);
  59         CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 reduce to 29 bits failed",
  60                                 sal_Int32(0x3D555555), aFract3.GetNumerator() );
  61         CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 reduce to 29 bits failed",
  62                                 sal_Int32(0x1AAAAAAA), aFract3.GetDenominator() );
  63
  64         aFract3.ReduceInaccurate(9);
  65         CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 reduce to 9 bits failed",
  66                                 sal_Int32(0x0147), aFract3.GetNumerator() );
  67         CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 reduce to 9 bits failed",
  68                                 sal_Int32(0x008E), aFract3.GetDenominator() );
  69
  70         aFract3.ReduceInaccurate(1);
  71         CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 reduce to 1 bit failed",
  72                                 sal_Int32(2), aFract3.GetNumerator() );
  73         CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 reduce to 1 bit failed",
  74                                 sal_Int32(1), aFract3.GetDenominator() );
  75
  76         aFract3.ReduceInaccurate(0);
  77         CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 reduce to 0 bits failed",
  78                                 sal_Int32(2), aFract3.GetNumerator() );
  79         CPPUNIT_ASSERT_EQUAL_MESSAGE( "Fraction #3 reduce to 0 bits failed",
  80                                 sal_Int32(1), aFract3.GetDenominator() );
  81
  82     }
  83
  84     void testMinLongDouble() {
  85         Fraction f(double(SAL_MIN_INT32));
  86         CPPUNIT_ASSERT_EQUAL(SAL_MIN_INT32, f.GetNumerator());
  87         CPPUNIT_ASSERT_EQUAL(sal_Int32(1), f.GetDenominator());
  88     }
  89
  90     void testCreateFromDoubleIn32BitsPlatform() {
  91         // This pass in 64 bits but fail in 32 bits
  92         Fraction f(0.960945);
  93         CPPUNIT_ASSERT_EQUAL(true, f.IsValid());
  94     }
  95
  96     CPPUNIT_TEST_SUITE(FractionTest);
  97     CPPUNIT_TEST(testFraction);
  98     CPPUNIT_TEST(testMinLongDouble);
  99     CPPUNIT_TEST(testCreateFromDoubleIn32BitsPlatform);
 100     CPPUNIT_TEST_SUITE_END();
 101 };
 102
 103
 104 CPPUNIT_TEST_SUITE_REGISTRATION(FractionTest);
 105 } // namespace tools
 106
 107 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */