P14Test.java

package com.shekhargulati.ninetynine_problems._01_lists;

import org.junit.Test;

import java.util.Arrays;
import java.util.List;

import static org.hamcrest.collection.IsCollectionWithSize.hasSize;
import static org.hamcrest.collection.IsIterableContainingInOrder.contains;
import static org.junit.Assert.assertThat;

public class P14Test {

    @Test
    public void shouldDuplicateElementsInAList() throws Exception {
        List<String> duplicates = P14.duplicate(Arrays.asList("a", "b", "c", "d"));
        assertThat(duplicates, hasSize(8));
        assertThat(duplicates, contains("a", "a", "b", "b", "c", "c", "d", "d"));
    }
}