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import java.util.Arrays;
import java.util.Random;
import static org.junit.Assert.assertArrayEquals;
import org.junit.Test;
public class EvenNumbersTest {
private static int[] divisibleBy(int[] numbers, int divider) {
return Arrays.stream(numbers).filter(n -> n % divider == 0).toArray();
}
@Test public void testSimple() {
assertArrayEquals(new int[] {2,4,6}, EvenNumbers.divisibleBy(new int[] {1,2,3,4,5,6},2));
assertArrayEquals(new int[] {3,6}, EvenNumbers.divisibleBy(new int[] {1,2,3,4,5,6},3));
assertArrayEquals(new int[] {0,4}, EvenNumbers.divisibleBy(new int[] {0,1,2,3,4,5,6},4));
}
@Test public void testRandom() {
Random r = new Random();
for (int i = 0; i < 20; i++) {
int n = 2 + r.nextInt(10);
int[] a = r.ints(100,0,100).toArray();
assertArrayEquals(divisibleBy(a, n), EvenNumbers.divisibleBy(a, n));
}
}
}
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