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Java example source code file (WeightedObservedPointsTest.java)

This example Java source code file (WeightedObservedPointsTest.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

list, test, util, weightedobservedpoint, weightedobservedpoints, weightedobservedpointstest

The WeightedObservedPointsTest.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.fitting;

import java.util.List;
import org.junit.Assert;
import org.junit.Test;
import org.apache.commons.math3.util.Precision;

/**
 * Tests {@link WeightedObservedPoints}.
 *
 */
public class WeightedObservedPointsTest {
    @Test
    public void testAdd1() {
        final WeightedObservedPoints store = new WeightedObservedPoints();

        final double x = 1.2;
        final double y = 34.56;
        final double w = 0.789;

        store.add(w, x, y);

        Assert.assertTrue(lastElementIsSame(store, new WeightedObservedPoint(w, x, y)));
    }

    @Test
    public void testAdd2() {
        final WeightedObservedPoints store = new WeightedObservedPoints();

        final double x = 1.2;
        final double y = 34.56;
        final double w = 0.789;

        store.add(new WeightedObservedPoint(w, x, y));

        Assert.assertTrue(lastElementIsSame(store, new WeightedObservedPoint(w, x, y)));
    }

    @Test
    public void testAdd3() {
        final WeightedObservedPoints store = new WeightedObservedPoints();

        final double x = 1.2;
        final double y = 34.56;

        store.add(x, y);

        Assert.assertTrue(lastElementIsSame(store, new WeightedObservedPoint(1, x, y)));
    }

    @Test
    public void testClear() {
        final WeightedObservedPoints store = new WeightedObservedPoints();

        store.add(new WeightedObservedPoint(1, 2, 3));
        store.add(new WeightedObservedPoint(2, -1, -2));
        Assert.assertTrue(store.toList().size() == 2);

        store.clear();
        Assert.assertTrue(store.toList().size() == 0);
    }

    // Ensure that an instance returned by "toList()" is independent from
    // the original container.
    @Test
    public void testToListCopy() {
        final WeightedObservedPoints store = new WeightedObservedPoints();

        store.add(new WeightedObservedPoint(1, 2, 3));
        store.add(new WeightedObservedPoint(2, -3, -4));

        final List<WeightedObservedPoint> list = store.toList();
        Assert.assertTrue(list.size() == 2);

        // Adding an element to "list" has no impact on "store".
        list.add(new WeightedObservedPoint(1.2, 3.4, 5.6));
        Assert.assertFalse(list.size() == store.toList().size());

        // Clearing "store" has no impact on "list".
        store.clear();
        Assert.assertFalse(list.size() == 0);
    }

    /**
     * Checks that the contents of the last element is equal to the
     * contents of {@code p}.
     *
     * @param store Container.
     * @param point Observation.
     * @return {@code true} if both elements have the same contents.
     */
    private boolean lastElementIsSame(WeightedObservedPoints store,
                                      WeightedObservedPoint point) {
        final List<WeightedObservedPoint> list = store.toList();
        final WeightedObservedPoint lastPoint = list.get(list.size() - 1);

        if (!Precision.equals(lastPoint.getX(), point.getX())) {
            return false;
        }
        if (!Precision.equals(lastPoint.getY(), point.getY())) {
            return false;
        }
        if (!Precision.equals(lastPoint.getWeight(), point.getWeight())) {
            return false;
        }

        return true;
    }
}

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