import static org.junit.Assert.*;

import java.util.Arrays;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;

import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;


public class Test2CTest {

  @Rule
  public ExpectedException exception = ExpectedException.none();
  
  @Test
  public void testFirst() {
    assertEquals('m', Test2C.first("m"));
    assertEquals('t', Test2C.first("test"));
    assertEquals('v', Test2C.first("video"));
  }

  @Test
  public void testSecond() {
    assertEquals('m', Test2C.second("am"));
    assertEquals('t', Test2C.second("xtest"));
    assertEquals('v', Test2C.second("yvideo"));
  }
  
  @Test
  public void testSecondThrows1() {
    exception.expect(IllegalArgumentException.class);
    Test2C.second("");    
  }
  
  @Test
  public void testSecondThrows2() {
    exception.expect(IllegalArgumentException.class);
    Test2C.second("d");
  }

  @Test
  public void testLongest() {
    final String LONGEST = "Machiavellianism";
    final String S[] = {"A", "BC", "DEF", "GHIJ", LONGEST, "xyz"};
    final String EXP[] = {"A", "BC", "DEF", "GHIJ", LONGEST, LONGEST};
    Set<String> t = new TreeSet<String>();
    assertEquals("", Test2C.longest(t));
    
    for (int i = 0; i < S.length; i++) {
      t.add(S[i]);
      assertEquals(EXP[i], Test2C.longest(t));
    }
  }

  @Test
  public void testMostFrequent() {
    final String S[][] = 
      { {"a"},
        {"c", "b"},
        {"a", "x", "b", "b", "x"},
        {"a", "b", "q", "q", "q", "b", "x", "y"}
      };
    final String EXP[] = {"a", "b", "b", "q"};

    for (int i = 0; i < S.length; i++) {
      List<String> t = Arrays.asList(S[i]);
      assertEquals(EXP[i], Test2C.mostFrequent(t));
    }
  }
}