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Diffstat (limited to 'Userland/Libraries/LibM/TestMath.cpp')
| -rw-r--r-- | Userland/Libraries/LibM/TestMath.cpp | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/Userland/Libraries/LibM/TestMath.cpp b/Userland/Libraries/LibM/TestMath.cpp new file mode 100644 index 0000000000..1a5ce4e87a --- /dev/null +++ b/Userland/Libraries/LibM/TestMath.cpp @@ -0,0 +1,114 @@ +/* + * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER + * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <AK/TestSuite.h> + +#include <math.h> + +#define EXPECT_CLOSE(a, b) \ + { \ + EXPECT(fabs(a - b) < 0.000001); \ + } + +TEST_CASE(trig) +{ + EXPECT_CLOSE(sin(1234), 0.653316); + EXPECT_CLOSE(cos(1234), -0.830914); + EXPECT_CLOSE(tan(1234), -0.786262); + EXPECT_CLOSE(sqrt(1234), 35.128336) + EXPECT_CLOSE(sin(-1), -0.867955); + EXPECT_CLOSE(cos(-1), 0.594715); + EXPECT_CLOSE(tan(-1), -1.459446); + EXPECT(isnan(sqrt(-1))); + EXPECT(isnan(asin(1.1))); + EXPECT(isnan(asin(-1.1))); + EXPECT_CLOSE(asin(0), 0.0); + EXPECT_CLOSE(asin(0.01), 0.01); + EXPECT_CLOSE(asin(0.1), 0.100167); + EXPECT_CLOSE(asin(0.3), 0.304693); + EXPECT_CLOSE(asin(0.499), 0.522444); + EXPECT_CLOSE(asin(0.5), 0.523599); + EXPECT_CLOSE(asin(0.501), 0.524754); + EXPECT_CLOSE(asin(0.9), 1.119770); + EXPECT_CLOSE(asin(0.99), 1.429246); + EXPECT_CLOSE(asin(1.0), 1.570750); + EXPECT_CLOSE(atan(0), 0.0) + EXPECT_CLOSE(atan(0.5), 0.463648) + EXPECT_CLOSE(atan(-0.5), -0.463648) + EXPECT_CLOSE(atan(5.5), 1.390943) + EXPECT_CLOSE(atan(-5.5), -1.390943) + EXPECT_CLOSE(atan(555.5), 1.568996) +} + +TEST_CASE(other) +{ + EXPECT_EQ(trunc(9999999999999.5), 9999999999999.0); + EXPECT_EQ(trunc(-9999999999999.5), -9999999999999.0); +} + +TEST_CASE(exponents) +{ + struct values { + double x; + double exp; + double sinh; + double cosh; + double tanh; + }; + + values values[8] { + { 1.500000, 4.481626, 2.129246, 2.352379, 0.905148 }, + { 20.990000, 1304956710.432035, 652478355.216017, 652478355.216017, 1.000000 }, + { 20.010000, 490041186.687082, 245020593.343541, 245020593.343541, 1.000000 }, + { 0.000000, 1.000000, 0.000000, 1.000000, 0.000000 }, + { 0.010000, 1.010050, 0.010000, 1.000050, 0.010000 }, + { -0.010000, 0.990050, -0.010000, 1.000050, -0.010000 }, + { -1.000000, 0.367879, -1.175201, 1.543081, -0.761594 }, + { -17.000000, 0.000000, -12077476.376788, 12077476.376788, -1.000000 }, + }; + for (auto& v : values) { + EXPECT_CLOSE(exp(v.x), v.exp); + EXPECT_CLOSE(sinh(v.x), v.sinh); + EXPECT_CLOSE(cosh(v.x), v.cosh); + EXPECT_CLOSE(tanh(v.x), v.tanh); + } + EXPECT_EQ(exp(1000), std::numeric_limits<double>::infinity()); +} + +TEST_CASE(logarithms) +{ + EXPECT(isnan(log(-1))); + EXPECT(log(0) < -1000000); + EXPECT_CLOSE(log(0.5), -0.693233) + EXPECT_CLOSE(log(1.1), 0.095310) + EXPECT_CLOSE(log(5), 1.609480) + EXPECT_CLOSE(log(5.5), 1.704842) + EXPECT_CLOSE(log(500), 6.214104) + EXPECT_CLOSE(log2(5), 2.321989) + EXPECT_CLOSE(log10(5), 0.698988) +} + +TEST_MAIN(Math) |