StreamSupport的Junit测试用例

import org.junit.Test;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;
import static org.junit.Assert.assertEquals;

public class StreamSupportTest {

    @Test
    public void testStreamFilter() {
        List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);
        StreamSupport.stream(numbers.spliterator(), false)
                .filter(n -> n % 2 == 0)
                .collect(Collectors.toList());

        assertEquals(Arrays.asList(2, 4), numbers);
    }

    @Test
    public void testStreamMap() {
        List<String> names = Arrays.asList("John", "Jane", "Tom");
        List<String> upperCaseNames = StreamSupport.stream(names.spliterator(), false)
                .map(String::toUpperCase)
                .collect(Collectors.toList());

        assertEquals(Arrays.asList("JOHN", "JANE", "TOM"), upperCaseNames);
    }
}