com.opengamma.strata.math.impl.function.RealPolynomialFunction1DTest.java Source code

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Here is the source code for com.opengamma.strata.math.impl.function.RealPolynomialFunction1DTest.java

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/**
 * Copyright (C) 2009 - present by OpenGamma Inc. and the OpenGamma group of companies
 * 
 * Please see distribution for license.
 */
package com.opengamma.strata.math.impl.function;

import static org.testng.AssertJUnit.assertEquals;

import org.apache.commons.math3.random.Well44497b;
import org.testng.annotations.Test;

/**
 * Test.
 */
@Test
public class RealPolynomialFunction1DTest {

    private static final Well44497b RANDOM = new Well44497b(0L);
    private static final double[] C = new double[] { 3.4, 5.6, 1., -4. };
    private static final DoubleFunction1D F = new RealPolynomialFunction1D(C);
    private static final double EPS = 1e-12;

    @Test(expectedExceptions = IllegalArgumentException.class)
    public void testNullCoefficients() {
        new RealPolynomialFunction1D(null);
    }

    @Test(expectedExceptions = IllegalArgumentException.class)
    public void testEmptyCoefficients() {
        new RealPolynomialFunction1D(new double[0]);
    }

    @Test
    public void testEvaluate() {
        final double x = RANDOM.nextDouble();
        assertEquals(C[3] * Math.pow(x, 3) + C[2] * Math.pow(x, 2) + C[1] * x + C[0], F.applyAsDouble(x), EPS);
    }

    @Test
    public void testDerivative() {
        final double x = RANDOM.nextDouble();
        assertEquals(3 * C[3] * Math.pow(x, 2) + 2 * C[2] * x + C[1], F.derivative().applyAsDouble(x), EPS);
    }
}