com.github.rinde.rinsim.core.model.rand.RandomModelTest.java Source code

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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.core.model.rand;

import static org.junit.Assert.assertNotSame;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.mock;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

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

import com.github.rinde.rinsim.core.model.DependencyProvider;

/**
 * Tests {@link RandomModel}.
 * @author Rinde van Lon
 */
public class RandomModelTest {

    @SuppressWarnings("null")
    RandomModel model;

    /**
     * Create model.
     */
    @Before
    public void setUp() {
        model = RandomModel.builder().build(mock(DependencyProvider.class));
    }

    /**
     * Test of master.
     */
    @Test
    public void testMaster() {
        model.register(new RandomUser() {
            @Override
            public void setRandomGenerator(RandomProvider provider) {
                final RandomGenerator rng = provider.masterInstance();
                assertSame(model.masterRandomGenerator, rng);
                testUnmodifiable(rng);
            }
        });
    }

    /**
     * Should always work.
     */
    @Test
    public void testUnregister() {
        assertTrue(model.unregister(new RandomUser() {
            @Override
            public void setRandomGenerator(RandomProvider provider) {
            }
        }));
    }

    /**
     * Test new instance.
     */
    @Test
    public void testNewInstance() {
        model.register(new RandomUser() {
            @Override
            public void setRandomGenerator(RandomProvider provider) {
                assertNotSame(model.masterRandomGenerator, provider.newInstance());
            }
        });
    }

    /**
     * Not requesting an instance should be fine.
     */
    @Test
    public void testNotUsing() {
        model.register(new RandomUser() {
            @Override
            public void setRandomGenerator(RandomProvider provider) {
            }
        });
    }

    /**
     * Test of shared instance method.
     */
    @Test
    public void testSharedInstance() {
        final List<RandomGenerator> rngs = new ArrayList<>();
        model.register(new RandomUser() {
            @Override
            public void setRandomGenerator(RandomProvider provider) {
                rngs.add(provider.sharedInstance(List.class));
            }
        });
        model.register(new RandomUser() {
            @Override
            public void setRandomGenerator(RandomProvider provider) {
                rngs.add(provider.sharedInstance(List.class));
            }
        });
        model.register(new RandomUser() {
            @Override
            public void setRandomGenerator(RandomProvider provider) {
                rngs.add(provider.sharedInstance(Collection.class));
            }
        });
        testUnmodifiable(rngs.get(0));
        testUnmodifiable(rngs.get(1));
        testUnmodifiable(rngs.get(2));
        assertSame(rngs.get(0), rngs.get(1));
        assertNotSame(model.masterRandomGenerator, rngs.get(0));
        assertNotSame(model.masterRandomGenerator, rngs.get(2));
    }

    /**
     * Test that calling methods more than once results in an
     * {@link IllegalStateException}.
     */
    @Test
    public void testMaxUsage() {
        model.register(new RandomUser() {
            @Override
            public void setRandomGenerator(RandomProvider provider) {
                provider.getSeed();
                boolean fail = false;
                try {
                    provider.getSeed();
                } catch (final IllegalStateException e) {
                    fail = true;
                }
                assertTrue(fail);
                fail = false;
                try {
                    provider.masterInstance();
                } catch (final IllegalStateException e) {
                    fail = true;
                }
                assertTrue(fail);
                fail = false;
                try {
                    provider.newInstance();
                } catch (final IllegalStateException e) {
                    fail = true;
                }
                assertTrue(fail);
                fail = false;
                try {
                    provider.sharedInstance(Object.class);
                } catch (final IllegalStateException e) {
                    fail = true;
                }
                assertTrue(fail);
            }
        });
    }

    /**
     * Test that requesting something from the {@link RandomProvider} after the
     * {@link RandomUser#setRandomGenerator(RandomProvider)} is complete results
     * in an {@link IllegalStateException}.
     */
    @Test
    public void testTooLateUsage() {
        final List<RandomProvider> rp = new ArrayList<>();
        model.register(new RandomUser() {
            @Override
            public void setRandomGenerator(RandomProvider provider) {
                rp.add(provider);
            }
        });
        boolean fail = false;
        try {
            rp.get(0).masterInstance();
        } catch (final IllegalStateException e) {
            fail = true;
        }
        assertTrue(fail);
    }

    static void testUnmodifiable(RandomGenerator rng) {
        boolean fail = false;
        try {
            rng.setSeed(0);
        } catch (final UnsupportedOperationException e) {
            fail = true;
        }
        assertTrue(fail);
        fail = false;
        try {
            rng.setSeed(new int[] { 0 });
        } catch (final UnsupportedOperationException e) {
            fail = true;
        }
        assertTrue(fail);
        fail = false;
        try {
            rng.setSeed(123L);
        } catch (final UnsupportedOperationException e) {
            fail = true;
        }
        assertTrue(fail);
        fail = false;

        rng.nextBoolean();
        rng.nextBytes(new byte[] {});
        rng.nextDouble();
        rng.nextFloat();
        rng.nextGaussian();
        rng.nextInt();
        rng.nextInt(1);
        rng.nextLong();
    }
}