ListUtilsTest.java

package com.bericotech.clavin.util;

import static org.junit.Assert.*;

import java.io.IOException;
import java.security.InvalidParameterException;
import java.util.Arrays;
import java.util.List;

import org.junit.Test;

import static com.bericotech.clavin.util.ListUtils.chunkifyList;

/*#####################################################################
 * 
 * CLAVIN (Cartographic Location And Vicinity INdexer)
 * ---------------------------------------------------
 * 
 * Copyright (C) 2012-2013 Berico Technologies
 * http://clavin.bericotechnologies.com
 * 
 * ====================================================================
 * 
 * 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.
 * 
 * ====================================================================
 * 
 * ListUtilsTest.java
 * 
 *###################################################################*/

/**
 * Tests for list processing methods.
 * 
 */
public class ListUtilsTest {
    
    List<List<Integer>> chunkedLists;

    /**
     * Verifies the sublists produced are exactly what we expect.
     * 
     * Warnings are suppressed only because Eclipse/Java can't properly
     * figure out nested generics.
     */
    @SuppressWarnings("unchecked")
    @Test
    public void testChunkifyList() {
        List<Integer> list = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
        
        List<List<Integer>> lists3 = Arrays.asList(Arrays.asList(1, 2, 3), Arrays.asList(4, 5, 6), Arrays.asList(7, 8), Arrays.asList(9, 10));
        List<List<Integer>> lists4 = Arrays.asList(Arrays.asList(1, 2, 3, 4), Arrays.asList(5, 6, 7), Arrays.asList(8, 9, 10));
        List<List<Integer>> lists5 = Arrays.asList(Arrays.asList(1, 2, 3, 4, 5), Arrays.asList(6, 7, 8, 9, 10));
        
        chunkedLists = chunkifyList(list, 3);
        assertEquals("", lists3, chunkedLists);
        
        chunkedLists = chunkifyList(list, 4);
        assertEquals("", lists4, chunkedLists);
        
        chunkedLists = chunkifyList(list, 5);
        assertEquals("", lists5, chunkedLists);
        
        chunkedLists = chunkifyList(list, 6);
        assertEquals("", lists5, chunkedLists);
    }
    
    /**
     * Ensures an exception is thrown when trying to divide a List into
     * chunks of size zero.
     * 
     * @throws IOException
     */
    @Test(expected=InvalidParameterException.class)
    public void testZeroChunk() throws IOException {
        chunkifyList(null, 0);
    }

}