ListUtilsTest_insert.java

/**
 *  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.isis.core.commons.lang;

import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.CoreMatchers.nullValue;
import static org.junit.Assert.assertThat;

import java.util.List;

import com.google.common.collect.Lists;

import org.junit.Test;

public class ListUtilsTest_insert {
    
    @Test
    public void insert_whenInsertionPointAtBeginning() throws Exception {
        final List<Integer> list = Lists.newArrayList(Integer.valueOf(0), Integer.MAX_VALUE, Integer.MIN_VALUE);
        ListExtensions.insert(list, 0, Integer.valueOf(10));
        
        assertThat(list.size(), is(4));
        assertThat(list.get(0), is(Integer.valueOf(10)));
        assertThat(list.get(1), is(Integer.valueOf(0)));
        assertThat(list.get(2), is(Integer.MAX_VALUE));
        assertThat(list.get(3), is(Integer.MIN_VALUE));
    }
    
    @Test
    public void insert_whenInsertionPointInMiddle() throws Exception {
        final List<Integer> list = Lists.newArrayList(Integer.valueOf(0), Integer.MAX_VALUE, Integer.MIN_VALUE);
        ListExtensions.insert(list, 1, Integer.valueOf(10));
        
        assertThat(list.size(), is(4));
        assertThat(list.get(0), is(Integer.valueOf(0)));
        assertThat(list.get(1), is(Integer.valueOf(10)));
        assertThat(list.get(2), is(Integer.MAX_VALUE));
        assertThat(list.get(3), is(Integer.MIN_VALUE));
    }

    @Test
    public void insert_whenInsertionPointAtEnd() throws Exception {
        final List<Integer> list = Lists.newArrayList(Integer.valueOf(0), Integer.MAX_VALUE, Integer.MIN_VALUE);
        ListExtensions.insert(list, 3, Integer.valueOf(10));
        
        assertThat(list.size(), is(4));
        assertThat(list.get(0), is(Integer.valueOf(0)));
        assertThat(list.get(1), is(Integer.MAX_VALUE));
        assertThat(list.get(2), is(Integer.MIN_VALUE));
        assertThat(list.get(3), is(Integer.valueOf(10)));
    }
    
    @Test
    public void insert_whenInsertionPointBeyondEnd() throws Exception {
        final List<Integer> list = Lists.newArrayList(Integer.valueOf(0), Integer.MAX_VALUE, Integer.MIN_VALUE);
        ListExtensions.insert(list, 4, Integer.valueOf(10));
        
        assertThat(list.size(), is(5));
        assertThat(list.get(0), is(Integer.valueOf(0)));
        assertThat(list.get(1), is(Integer.MAX_VALUE));
        assertThat(list.get(2), is(Integer.MIN_VALUE));
        assertThat(list.get(3), is(nullValue()));
        assertThat(list.get(4), is(Integer.valueOf(10)));
    }
    
    

}