Android CPU perf tests

CpuPerfTests.java

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

import static java.math.BigInteger.ONE;

import org.junit.Test;

import java.math.BigInteger;
import java.util.stream.Stream;

public class CpuPerfTests {
    public static final int NUM_COUNT = 200000;
    public static final int CERTAINTY = 50;

    @Test
    public void computePrimes_singlethread() {
        BigInteger sum = Stream.iterate(ONE, (x) -> x.add(ONE))
            .filter(x -> x.isProbablePrime(CERTAINTY))
            .limit(NUM_COUNT)
            .reduce(BigInteger::add)
            .get();

        assertEquals(new BigInteger("264129169599"), sum);
    }

    @Test
    public void computePrimes_multithread() {
        BigInteger sum = Stream.iterate(ONE, (x) -> x.add(ONE))
                .parallel()
                .filter(x -> x.isProbablePrime(CERTAINTY))
                .limit(NUM_COUNT)
                .reduce(BigInteger::add)
                .get();

        assertEquals(new BigInteger("264129169599"), sum);
    }
}