import static org.junit.Assert.*;

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

public class RandomWithParityTest {

	private RandomWithParity p;

	@Before
	public void setUp() {
		p = new UnfilteredRandom();
	}

	@Test
	public void minRange() {
		int actual = p.generateNumber(1);
		assertTrue("Random number is 0 or 1", (actual == 0) || (actual == 1));
	}

	@Test
	public void repeatedMinRange() {
		int actual;
		for (int i = 0; i < 30; i++) {
			actual = p.generateNumber(1);
			assertTrue("Random number is 0 or 1", (actual == 0)
					|| (actual == 1));
		}
	}

	@Test
	public void increasingRanges() {
		int actual;
		for (int i = 0; i < 30; i++) {
			actual = p.generateNumber(1 + 2 * i);
			assertEquals("Random number is even", 0, actual % 2);
			actual = p.generateNumber(2 + 2 * i);
			assertEquals("Random number is even", 1, actual % 2);
		}
	}

	@Test
	public void maxRange() {
		int actual = p.generateNumber(Integer.MAX_VALUE);
		assertEquals("Maximum range", 0, actual % 2);
	}

	@Test(timeout = 100)
	public void largeRange() {
		p.generateNumber(100000);
		assertTrue("Large range", true);
	}
}