HashTable.java

import java.util.LinkedList;
import java.util.List;

public class HashTable<V> {

  private int capacity;
  private List<V>[] buckets;

  public HashTable(int capacity) {
    this.capacity = capacity;
    this.buckets = new LinkedList[capacity];
  }

  public void add(V value) {

  }

  public void remove(V value) {

  }

  public boolean contains(V value) {
    return false;
  }
}

HashTableTest.java

import org.junit.Before;
import org.junit.Test;

import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

public class HashTableTest {
  HashTable<String> t;
  @Before
  public void setUp() throws Exception {
    t = new HashTable<>(10);
  }

  @Test
  public void add() throws Exception {
    t.add("Hello");
    assertTrue(t.contains("Hello"));
  }

  @Test
  public void remove() throws Exception {
    fail();
  }

  @Test
  public void contains() throws Exception {
    fail();
  }

}