src/testutils/tests/testasserts_tests.cpp

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  35 /*! \internal \file
  36  * \brief
  37  * Tests \Gromacs-specific test assertions.
  38  *
  39  * \author Teemu Murtola <teemu.murtola@gmail.com>
  40  * \ingroup module_testutils
  41  */
  42 #include "gmxpre.h"
  43
  44 #include "testutils/testasserts.h"
  45
  46 #include <gtest/gtest.h>
  47
  48 namespace
  49 {
  50
  51 using ::testing::internal::FloatingPoint;
  52
  53 /*! \brief
  54  * Helper to produce floating-point numbers with specified ULP difference.
  55  *
  56  * This doesn't work if the value would change sign.
  57  *
  58  * \ingroup module_testutils
  59  */
  60 template <typename FloatType>
  61 FloatType addUlps(FloatType value, int ulps)
  62 {
  63     return FloatingPoint<FloatType>::ReinterpretBits(
  64             FloatingPoint<FloatType>(value).bits() + ulps);
  65 }
  66
  67 using ::gmx::test::FloatingPointDifference;
  68
  69 TEST(FloatingPointDifferenceTest, HandlesEqualValues)
  70 {
  71     FloatingPointDifference diff(1.2, 1.2);
  72     EXPECT_TRUE(diff.isDouble());
  73     EXPECT_FALSE(diff.isNaN());
  74     EXPECT_EQ(0.0, diff.asAbsolute());
  75     EXPECT_EQ(0U,  diff.asUlps());
  76     EXPECT_FALSE(diff.signsDiffer());
  77 }
  78
  79 // TODO: Use typed tests to run all the tests for single and double.
  80 TEST(FloatingPointDifferenceTest, HandlesFloatValues)
  81 {
  82     FloatingPointDifference diff(1.2f, 1.2f);
  83     EXPECT_FALSE(diff.isDouble());
  84     EXPECT_FALSE(diff.isNaN());
  85     EXPECT_EQ(0.0, diff.asAbsolute());
  86     EXPECT_EQ(0U,  diff.asUlps());
  87     EXPECT_FALSE(diff.signsDiffer());
  88 }
  89
  90 TEST(FloatingPointDifferenceTest, HandlesZerosOfDifferentSign)
  91 {
  92     FloatingPointDifference diff(0.0, GMX_DOUBLE_NEGZERO);
  93     EXPECT_FALSE(diff.isNaN());
  94     EXPECT_EQ(0.0, diff.asAbsolute());
  95     EXPECT_EQ(0U,  diff.asUlps());
  96     EXPECT_TRUE(diff.signsDiffer());
  97 }
  98
  99 TEST(FloatingPointDifferenceTest, HandlesSignComparisonWithZero)
 100 {
 101     {
 102         FloatingPointDifference diff(0.0, -1.2);
 103         EXPECT_FALSE(diff.isNaN());
 104         EXPECT_DOUBLE_EQ(1.2, diff.asAbsolute());
 105         EXPECT_TRUE(diff.signsDiffer());
 106     }
 107     {
 108         FloatingPointDifference diff(GMX_DOUBLE_NEGZERO, -1.2);
 109         EXPECT_FALSE(diff.isNaN());
 110         EXPECT_DOUBLE_EQ(1.2, diff.asAbsolute());
 111         EXPECT_FALSE(diff.signsDiffer());
 112     }
 113 }
 114
 115 TEST(FloatingPointDifferenceTest, HandlesUlpDifferences)
 116 {
 117     const double first  = 1.0;
 118     const double second = addUlps(first, 2);
 119     {
 120         FloatingPointDifference diff(first, second);
 121         EXPECT_FALSE(diff.isNaN());
 122         EXPECT_DOUBLE_EQ(second - first, diff.asAbsolute());
 123         EXPECT_EQ(2U, diff.asUlps());
 124         EXPECT_FALSE(diff.signsDiffer());
 125     }
 126     {
 127         FloatingPointDifference diff(second, first);
 128         EXPECT_FALSE(diff.isNaN());
 129         EXPECT_DOUBLE_EQ(second - first, diff.asAbsolute());
 130         EXPECT_EQ(2U, diff.asUlps());
 131         EXPECT_FALSE(diff.signsDiffer());
 132     }
 133 }
 134
 135 TEST(FloatingPointDifferenceTest, HandlesUlpDifferenceAcrossZero)
 136 {
 137     const double            first  = addUlps(GMX_DOUBLE_NEGZERO, 2);
 138     const double            second = addUlps( 0.0, 2);
 139     FloatingPointDifference diff(first, second);
 140     EXPECT_FALSE(diff.isNaN());
 141     EXPECT_DOUBLE_EQ(second - first, diff.asAbsolute());
 142     EXPECT_EQ(4U, diff.asUlps());
 143     EXPECT_TRUE(diff.signsDiffer());
 144 }
 145
 146 TEST(FloatingPointDifferenceTest, HandlesNaN)
 147 {
 148     const double            first  = std::numeric_limits<double>::quiet_NaN();
 149     const double            second = 2.0;
 150     FloatingPointDifference diff(first, second);
 151     EXPECT_TRUE(diff.isNaN());
 152 }
 153
 154 TEST(FloatingPointToleranceTest, UlpTolerance)
 155 {
 156     using gmx::test::ulpTolerance;
 157
 158     FloatingPointDifference fequal(1.0, 1.0);
 159     FloatingPointDifference fulp2(1.0f, addUlps(1.0f, 2));
 160     EXPECT_TRUE(ulpTolerance(0).isWithin(fequal));
 161     EXPECT_FALSE(ulpTolerance(1).isWithin(fulp2));
 162     EXPECT_TRUE(ulpTolerance(2).isWithin(fulp2));
 163
 164     FloatingPointDifference dequal(1.0, 1.0);
 165     FloatingPointDifference dulp2(1.0,  addUlps(1.0, 2));
 166     FloatingPointDifference dulp2f(1.0,  static_cast<double>(addUlps(1.0f, 2)));
 167     EXPECT_TRUE(ulpTolerance(0).isWithin(dequal));
 168     EXPECT_TRUE(ulpTolerance(2).isWithin(dulp2));
 169     EXPECT_FALSE(ulpTolerance(2).isWithin(dulp2f));
 170 }
 171
 172 TEST(FloatingPointToleranceTest, RelativeToleranceAsFloatingPoint)
 173 {
 174     using gmx::test::relativeToleranceAsFloatingPoint;
 175
 176     FloatingPointDifference fequal(1.0f, 1.0f);
 177     FloatingPointDifference fulp2(1.0f, addUlps(1.0f, 2));
 178     FloatingPointDifference fdiff(1.0f, 1.011f);
 179     FloatingPointDifference fsmall(0.1f, 0.111f);
 180     FloatingPointDifference fsmall2(0.1f, 0.121f);
 181     EXPECT_TRUE(relativeToleranceAsFloatingPoint(1.0, 1e-2).isWithin(fequal));
 182     EXPECT_TRUE(relativeToleranceAsFloatingPoint(1.0, 1e-9).isWithin(fequal));
 183     EXPECT_TRUE(relativeToleranceAsFloatingPoint(1.0, 1e-2).isWithin(fulp2));
 184     EXPECT_FALSE(relativeToleranceAsFloatingPoint(1.0, 1e-9).isWithin(fulp2));
 185     EXPECT_FALSE(relativeToleranceAsFloatingPoint(1.0, 1e-2).isWithin(fdiff));
 186     EXPECT_TRUE(relativeToleranceAsFloatingPoint(1.0, 2e-2).isWithin(fdiff));
 187     EXPECT_TRUE(relativeToleranceAsFloatingPoint(1.0, 2e-2).isWithin(fsmall));
 188     EXPECT_FALSE(relativeToleranceAsFloatingPoint(0.1, 2e-2).isWithin(fsmall));
 189     EXPECT_FALSE(relativeToleranceAsFloatingPoint(1.0, 2e-2).isWithin(fsmall2));
 190
 191     FloatingPointDifference dequal(1.0, 1.0);
 192     FloatingPointDifference dulp2f(1.0, static_cast<double>(addUlps(1.0f, 2)));
 193     FloatingPointDifference ddiff(1.0, 1.011);
 194     FloatingPointDifference dsmall(0.1, 0.111);
 195     FloatingPointDifference dsmall2(0.1, 0.121);
 196     EXPECT_TRUE(relativeToleranceAsFloatingPoint(1.0, 1e-2).isWithin(dequal));
 197     EXPECT_TRUE(relativeToleranceAsFloatingPoint(1.0, 1e-9).isWithin(dequal));
 198     EXPECT_TRUE(relativeToleranceAsFloatingPoint(1.0, 1e-2).isWithin(dulp2f));
 199     EXPECT_FALSE(relativeToleranceAsFloatingPoint(1.0, 1e-9).isWithin(dulp2f));
 200     EXPECT_FALSE(relativeToleranceAsFloatingPoint(1.0, 1e-2).isWithin(ddiff));
 201     EXPECT_TRUE(relativeToleranceAsFloatingPoint(1.0, 2e-2).isWithin(ddiff));
 202     EXPECT_TRUE(relativeToleranceAsFloatingPoint(1.0, 2e-2).isWithin(dsmall));
 203     EXPECT_FALSE(relativeToleranceAsFloatingPoint(0.1, 2e-2).isWithin(dsmall));
 204     EXPECT_FALSE(relativeToleranceAsFloatingPoint(1.0, 2e-2).isWithin(dsmall2));
 205 }
 206
 207 TEST(FloatingPointToleranceTest, RelativeToleranceAsUlp)
 208 {
 209     using gmx::test::relativeToleranceAsUlp;
 210
 211     FloatingPointDifference fequal(1.0f, 1.0f);
 212     FloatingPointDifference fulp4(1.0f, addUlps(1.0f, 4));
 213     FloatingPointDifference fsmall(0.1f, addUlps(1.0f, 2) - 0.9f);
 214     FloatingPointDifference fsmall2(0.1f, addUlps(1.0f, 6) - 0.9f);
 215     EXPECT_TRUE(relativeToleranceAsUlp(1.0, 2).isWithin(fequal));
 216     EXPECT_FALSE(relativeToleranceAsUlp(1.0, 2).isWithin(fulp4));
 217     EXPECT_TRUE(relativeToleranceAsUlp(1.0, 4).isWithin(fulp4));
 218     EXPECT_TRUE(relativeToleranceAsUlp(1.0, 4).isWithin(fsmall));
 219     EXPECT_FALSE(relativeToleranceAsUlp(0.1, 4).isWithin(fsmall));
 220     EXPECT_FALSE(relativeToleranceAsUlp(1.0, 4).isWithin(fsmall2));
 221
 222     FloatingPointDifference dequal(1.0, 1.0);
 223     FloatingPointDifference dulp4(1.0, addUlps(1.0, 4));
 224     FloatingPointDifference dulp4f(1.0,  static_cast<double>(addUlps(1.0f, 4)));
 225     FloatingPointDifference dsmall(0.1, addUlps(1.0, 2) - 0.9);
 226     FloatingPointDifference dsmall2(0.1, addUlps(1.0, 6) - 0.9);
 227     EXPECT_TRUE(relativeToleranceAsUlp(1.0, 2).isWithin(dequal));
 228     EXPECT_FALSE(relativeToleranceAsUlp(1.0, 2).isWithin(dulp4));
 229     EXPECT_TRUE(relativeToleranceAsUlp(1.0, 4).isWithin(dulp4));
 230     EXPECT_FALSE(relativeToleranceAsUlp(1.0, 4).isWithin(dulp4f));
 231     EXPECT_TRUE(relativeToleranceAsUlp(1.0, 4).isWithin(dsmall));
 232     EXPECT_FALSE(relativeToleranceAsUlp(0.1, 4).isWithin(dsmall));
 233     EXPECT_FALSE(relativeToleranceAsUlp(1.0, 4).isWithin(dsmall2));
 234 }
 235
 236 } // namespace