com.github.rinde.rinsim.scenario.generator.LocationsTest.java Source code

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Here is the source code for com.github.rinde.rinsim.scenario.generator.LocationsTest.java

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/*
 * Copyright (C) 2011-2016 Rinde van Lon, iMinds-DistriNet, KU Leuven
 *
 * Licensed 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 com.github.rinde.rinsim.scenario.generator;

import static java.util.Arrays.asList;
import static org.junit.Assert.assertEquals;

import java.util.List;

import org.apache.commons.math3.random.MersenneTwister;
import org.apache.commons.math3.random.RandomGenerator;
import org.junit.Test;

import com.github.rinde.rinsim.geom.Point;
import com.github.rinde.rinsim.scenario.generator.Locations.LocationGenerator;
import com.github.rinde.rinsim.testutil.TestUtil;

/**
 * Tests for {@link Locations}.
 * @author Rinde van Lon
 */
public class LocationsTest {

    /**
     * Tests whether the fixed location generator handles the inputs correctly.
     */
    @Test
    public void testFixed() {
        final LocationGenerator lg = Locations.builder().buildFixed(asList(new Point(0, 0), new Point(1, 1)));
        assertAlwaysEquals(lg);

        assertEquals(new Point(.5, .5), lg.getCenter());
        assertEquals(new Point(0, 0), lg.getMin());
        assertEquals(new Point(1, 1), lg.getMax());

        final LocationGenerator lg2 = Locations.builder().min(-6.3).max(9.3).mean(0.1)
                .buildFixed(asList(new Point(0, 0), new Point(1, 1)));

        assertAlwaysEquals(lg2);
        assertEquals(new Point(.1, .1), lg2.getCenter());
        assertEquals(new Point(-6.3, -6.3), lg2.getMin());
        assertEquals(new Point(9.3, 9.3), lg2.getMax());

        TestUtil.testPrivateConstructor(Locations.class);
    }

    /**
     * An error should be thrown when a wrong number of locations is requested.
     */
    @Test(expected = IllegalArgumentException.class)
    public void testFixedFail() {
        Locations.builder().buildFixed(asList(new Point(0, 0), new Point(1, 1))).generate(0L, 3);
    }

    static void assertAlwaysEquals(LocationGenerator lg) {
        final RandomGenerator rng = new MersenneTwister(123);
        final List<Point> points = lg.generate(rng.nextLong(), 2);
        for (int i = 0; i < 5; i++) {
            final List<Point> points2 = lg.generate(rng.nextLong(), 2);
            assertEquals(points, points2);
        }
    }

}