import mir.test: shouldApprox;

1.0.generalizedParetoCCDF(1, 1, 0.5).shouldApprox == 1;
2.0.generalizedParetoCCDF(1, 1, 0.5).shouldApprox == 0.4444444;
3.0.generalizedParetoCCDF(2, 3, 0.25).shouldApprox == 0.726025;
5.0.generalizedParetoCCDF(2, 3, 0).shouldApprox == 0.3678794;