TestRand.java

package fj.test;

import fj.Equal;
import fj.Ord;
import fj.data.List;
import fj.data.Stream;
import org.junit.Assert;
import org.junit.Test;

import static org.junit.Assert.assertTrue;

/**
 * Created by MarkPerry on 4/06/2015.
 */
public class TestRand {

    @Test
    public void testRandLowHighInclusive() {
        int min = 5;
        int max = 10;
        int n = 100;
        Stream<Integer> s = Stream.range(0, n).map(i -> Rand.standard.choose(min, max)).sort(Ord.intOrd);
//        System.out.println(s.toList());
        assertTrue(s.head() == min && s.last() == max);
    }

  @Test
  public void testReseed() {
    Rand rand1 = Rand.standard.reseed(42);
    List<Integer> s1 =
        List.range(0, 10).map(i -> rand1.choose(Integer.MIN_VALUE, Integer.MAX_VALUE));

    Rand rand2 = rand1.reseed(42);
    List<Integer> s2 =
        List.range(0, 10).map(i -> rand2.choose(Integer.MIN_VALUE, Integer.MAX_VALUE));

    assertTrue(s1.zip(s2).forall(p -> p._1().equals(p._2())));
    Assert.assertFalse(s1.allEqual(Equal.intEqual));
  }

}