Java example source code file (DoubleArrayAbstractTest.java)

This example Java source code file (DoubleArrayAbstractTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

doublearray, doublearrayabstracttest, max, min, number, test, the, there

The DoubleArrayAbstractTest.java Java example source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.math3.util;

import org.apache.commons.math3.stat.StatUtils;
import org.junit.Assert;
import org.junit.Test;


/**
 * This class contains test cases for the ExpandableDoubleArray.
 *
 */
public abstract class DoubleArrayAbstractTest {

    protected DoubleArray da = null;

    // Array used to test rolling
    protected DoubleArray ra = null;

    @Test
    public void testAdd1000() {

        for (int i = 0; i < 1000; i++) {
            da.addElement(i);
        }

        Assert.assertEquals(
            "Number of elements should be equal to 1000 after adding 1000 values",
            1000,
            da.getNumElements());

        Assert.assertEquals(
            "The element at the 56th index should be 56",
            56.0,
            da.getElement(56),
            Double.MIN_VALUE);

    }

    @Test
    public void testGetValues() {
        double[] controlArray = { 2.0, 4.0, 6.0 };

        da.addElement(2.0);
        da.addElement(4.0);
        da.addElement(6.0);
        double[] testArray = da.getElements();

        for (int i = 0; i < da.getNumElements(); i++) {
            Assert.assertEquals(
                "The testArray values should equal the controlArray values, index i: "
                    + i
                    + " does not match",
                testArray[i],
                controlArray[i],
                Double.MIN_VALUE);
        }

    }

    @Test
    public void testAddElementRolling() {
        ra.addElement(0.5);
        ra.addElement(1.0);
        ra.addElement(1.0);
        ra.addElement(1.0);
        ra.addElement(1.0);
        ra.addElement(1.0);
        ra.addElementRolling(2.0);

        Assert.assertEquals(
            "There should be 6 elements in the eda",
            6,
            ra.getNumElements());
        Assert.assertEquals(
            "The max element should be 2.0",
            2.0,
            StatUtils.max(ra.getElements()),
            Double.MIN_VALUE);
        Assert.assertEquals(
            "The min element should be 1.0",
            1.0,
            StatUtils.min(ra.getElements()),
            Double.MIN_VALUE);

        for (int i = 0; i < 1024; i++) {
            ra.addElementRolling(i);
        }

        Assert.assertEquals(
            "We just inserted 1024 rolling elements, num elements should still be 6",
            6,
            ra.getNumElements());
    }

    @Test
    public void testMinMax() {
        da.addElement(2.0);
        da.addElement(22.0);
        da.addElement(-2.0);
        da.addElement(21.0);
        da.addElement(22.0);
        da.addElement(42.0);
        da.addElement(62.0);
        da.addElement(22.0);
        da.addElement(122.0);
        da.addElement(1212.0);

        Assert.assertEquals("Min should be -2.0", -2.0, StatUtils.min(da.getElements()), Double.MIN_VALUE);
        Assert.assertEquals(
            "Max should be 1212.0",
            1212.0,
            StatUtils.max(da.getElements()),
            Double.MIN_VALUE);
    }

}