private static final double[] PARAMETERS_NS = new double[] {BETA0, BETA1, BETA2, LAMBDA};
private static final GeneratorCurveYieldNelsonSiegel GENERATOR_NS = new GeneratorCurveYieldNelsonSiegel();
@Test(expectedExceptions = IllegalArgumentException.class)
public void nullYieldNodes() {
new GeneratorCurveYieldInterpolatedNode(null, LINEAR_FLAT);
}