test_splines.cpp

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#include <gtest/gtest.h>
#include <spline_smoother/splines.h>
#include <stdlib.h>

using namespace spline_smoother;

static double getRandomNumber(double min, double max)
{
  return ((double)rand() / RAND_MAX)*(max-min) + min;
}

TEST(TestSplines, testQuinticCoefficients)
{
  // seed the random number generator:
  srand(0);

  // generate random boundary conditions:
  double bc[6];
  for (int i=0; i<6; i++)
    bc[i] = getRandomNumber(-1.0, 1.0);

  // and a random time:
  double time = getRandomNumber(0.5,10.0);

  // get the spline coefficients:
  std::vector<double> coeffs;
  getQuinticSplineCoefficients(bc[0], bc[1], bc[2], bc[3], bc[4], bc[5], time, coeffs);

  // now sample the spline at t=0 and t=time to cross-check
  double test_bc[6];
  sampleQuinticSpline(coeffs, 0, test_bc[0], test_bc[1], test_bc[2]);
  sampleQuinticSpline(coeffs, time, test_bc[3], test_bc[4], test_bc[5]);

  double tolerance=1e-10;

  EXPECT_NEAR(bc[0], test_bc[0], tolerance);
  EXPECT_NEAR(bc[1], test_bc[1], tolerance);
  EXPECT_NEAR(bc[2], test_bc[2], tolerance);
  EXPECT_NEAR(bc[3], test_bc[3], tolerance);
  EXPECT_NEAR(bc[4], test_bc[4], tolerance);
  EXPECT_NEAR(bc[5], test_bc[5], tolerance);
}

TEST(TestSplines, testCubicCoefficients)
{
  // seed the random number generator:
  srand(1);

  // generate random boundary conditions:
  double bc[4];
  for (int i=0; i<4; i++)
    bc[i] = getRandomNumber(-1.0, 1.0);

  // and a random time:
  double time = getRandomNumber(0.5,10.0);

  // get the spline coefficients:
  std::vector<double> coeffs;
  getCubicSplineCoefficients(bc[0], bc[1], bc[2], bc[3], time, coeffs);

  // now sample the spline at t=0 and t=time to cross-check
  double test_bc[4];
  double dummy;
  sampleCubicSpline(coeffs, 0, test_bc[0], test_bc[1], dummy);
  sampleCubicSpline(coeffs, time, test_bc[2], test_bc[3], dummy);

  double tolerance=1e-10;

  EXPECT_NEAR(bc[0], test_bc[0], tolerance);
  EXPECT_NEAR(bc[1], test_bc[1], tolerance);
  EXPECT_NEAR(bc[2], test_bc[2], tolerance);
  EXPECT_NEAR(bc[3], test_bc[3], tolerance);
}

int main(int argc, char** argv)
{
 testing::InitGoogleTest(&argc, argv);
 return RUN_ALL_TESTS();
}