StreamExApiTest.java

/*
 * Copyright 2015, 2016 Tagir Valeev
 * 
 * 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 one.util.streamex.api;

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

import java.util.List;
import java.util.function.BiFunction;
import java.util.function.Function;

import one.util.streamex.StreamEx;

import org.junit.Test;

/**
 * @author Tagir Valeev
 */
public class StreamExApiTest {
    @Test
    public void testMap() {
        BiFunction<StreamEx<Integer>, Function<Integer, Integer>, StreamEx<Integer>> streamMapper = StreamEx::map;
		assertEquals(asList(2, 4, 10),
				streamMapper.apply(StreamEx.of(1, 2, 5), x -> x * 2).toList());
    }
    
    @Test
    public void testAppend() {
        List<String> input = asList("a", "b", "c");
        assertEquals(input, input.stream().map(StreamEx::of).reduce(StreamEx::append).get().toList());
    }
    
    @Test
    public void testPrepend() {
        List<String> input = asList("a", "b", "c");
        List<String> expected = asList("c", "b", "a");
        assertEquals(expected, input.stream().map(StreamEx::of).reduce(StreamEx::prepend).get().toList());
    }
}