Computing with Data

elgeish

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Previous: Test Hooks - Part II Next: Dealing with Randomness - Part II

Dealing with Randomness - Part I

Here's an example of a Java unit test that verifies the behavior of a coin-flipping Bernoulli trial:

import org.testng.annotations.Test;
import java.util.Random;
import static org.testng.Assert.*;
class CoinFlipper {
  public enum Face {HEAD, TAIL}
  
  private final Random random = new Random();
  
  public Face flip() {
    return random.nextBoolean() ? Face.HEAD : Face.TAIL;
  }
}
public class CoinFlipperTest {
  @Test
  public void testFlip() {
    final CoinFlipper flipper = new CoinFlipper();
    final int trialsCount = 100;
    int headsCount = 0;
    
    for (int i = 0; i < trialsCount; i++) {
      if (flipper.flip() == CoinFlipper.Face.HEAD) {
        ++headsCount;
      }
    }
    
    assertTrue(Math.abs(headsCount - trialsCount / 2) <= 5);
  }
}

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271/300 Dealing with Randomness - Part I

Dealing with Randomness - Part I

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