import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import org.junit.Test;

public class TrieSTTest {

  @Test
  public void size() {
    TrieST<Integer> st = new TrieST<Integer>();
    assertEquals(0, st.size());
  }

  @Test
  public void isEmpty() {
    TrieST<Integer> st = new TrieST<Integer>();
    assertTrue(st.isEmpty());
  }
}

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import org.junit.Test;

public class TrieSTTest {

  @Test
  public void testSize() {
    TrieST<Integer> st = new TrieST<Integer>();
    assertEquals(0, st.size());
  }

  @Test
  public void testIsEmpty() {
    TrieST<Integer> st = new TrieST<Integer>();
    assertTrue(st.isEmpty());
  }
}

Update functions name to match jUnit convention
Update functions name to match jUnit convention
