com.github.steveash.jg2p.util.CartesianProductIterableTest.java Source code

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Here is the source code for com.github.steveash.jg2p.util.CartesianProductIterableTest.java

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/*
 * Copyright 2014 Steve Ash
 *
 * 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.steveash.jg2p.util;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;

import org.apache.commons.lang3.tuple.Pair;
import org.junit.Test;

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

import static com.google.common.collect.Iterables.limit;
import static org.hamcrest.Matchers.contains;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertThat;

public class CartesianProductIterableTest {

    List<String> source = ImmutableList.of("A", "B", "C", "D");

    @Test
    public void testIteratorEmpty() {
        CartesianProductIterable<String> set = CartesianProductIterable.of(new ArrayList<String>());
        assertFalse(set.iterator().hasNext());
        assertEquals(0, Iterables.size(set));
    }

    @Test
    public void testIteratorOne() {
        CartesianProductIterable<String> set = CartesianProductIterable.of(source.subList(0, 1));
        assertFalse(set.iterator().hasNext());
    }

    @Test
    public void testIteratorTwo() {
        assertThat(CartesianProductIterable.of(limit(source, 2)), contains(Pair.of("A", "B")));
    }

    @Test
    public void testIteratorThree() {
        CartesianProductIterable<String> set = CartesianProductIterable.of(source.subList(0, 3));
        assertThat(set, contains(Pair.of("A", "B"), Pair.of("A", "C"), Pair.of("B", "C")));

        assertEquals(3, Iterables.size(set));
    }

    @SuppressWarnings("unchecked")
    @Test
    public void testIteratorFour() {
        assertThat(CartesianProductIterable.of(limit(source, 4)), contains(Pair.of("A", "B"), Pair.of("A", "C"),
                Pair.of("A", "D"), Pair.of("B", "C"), Pair.of("B", "D"), Pair.of("C", "D")));
    }
}