private StepInterpolator buildInterpolator(double t0, double[] y0, double t1) {
DummyStepInterpolator interpolator = new DummyStepInterpolator(y0, new double[y0.length], t1 >= t0);
interpolator.storeTime(t0);
interpolator.shift();
interpolator.storeTime(t1);
return interpolator;
}
public void checkValue(double value, double reference) {
Assert.assertTrue(FastMath.abs(value - reference) < 1.0e-10);