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/*
* (C) Copyright 1996- ECMWF.
*
* This software is licensed under the terms of the Apache Licence Version 2.0
* which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
*
* In applying this licence, ECMWF does not waive the privileges and immunities
* granted to it by virtue of its status as an intergovernmental organisation nor
* does it submit to any jurisdiction.
*/
#include "eckit/geo/util.h"
#include "eckit/maths/FloatingPointExceptions.h"
#include "eckit/testing/Test.h"
#include "eckit/types/FloatCompare.h"
#define EXPECT_APPROX(a, b) EXPECT(::eckit::types::is_approximately_equal<double>((a), (b), 1e-6))
namespace eckit::geo::test {
/**
* This case verifies that Floating Point Exceptions (FPEs) don't trigger for the functions:
* - eckit::geo::util::gaussian_latitudes
* - eckit::geo::util::gaussian_quadrature_weights
*
* FPE trapping is enabled to ensure any FPE-triggering operations are caught.
* @see ECKIT-674
*/
CASE("gaussian_latitudes") {
const auto& lats_1 = geo::util::gaussian_latitudes(1, true);
EXPECT(lats_1.size() == 2);
EXPECT_APPROX(lats_1.front(), -35.264390);
EXPECT_APPROX(lats_1.front(), -lats_1.back());
const auto& lats_2 = geo::util::gaussian_latitudes(80, false);
EXPECT(lats_2.size() == 2 * 80);
EXPECT_APPROX(lats_2.front(), 89.141519);
EXPECT_APPROX(lats_2.front(), -lats_2.back());
}
CASE("gaussian_quadrature_weights") {
const auto& quad_1 = geo::util::gaussian_quadrature_weights(1);
EXPECT(quad_1.size() == 2);
EXPECT_APPROX(quad_1.front(), 0.5);
EXPECT_APPROX(quad_1.front(), quad_1.back());
const auto& quad_2 = geo::util::gaussian_quadrature_weights(80);
EXPECT(quad_2.size() == 2 * 80);
EXPECT_APPROX(quad_2.front(), 0.000144);
EXPECT_APPROX(quad_2.front(), quad_2.back());
}
} // namespace eckit::geo::test
int main(int argc, char** argv) {
eckit::maths::FloatingPointExceptions::enable_floating_point_exceptions();
return eckit::testing::run_tests(argc, argv);
}
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