fix test

hutool-core/src/main/java/cn/hutool/core/collection/ListUtil.java

@@ -320,19 +320,35 @@ public class ListUtil {
 		}
 	}
 
+	/**
+	 * 针对List自然排序，排序会修改原List
+	 *
+	 * @param <T>  元素类型
+	 * @param list 被排序的List
+	 * @return 原list
+	 * @see Collections#sort(List, Comparator)
+	 */
+	public static <T> List<T> sort(final List<T> list) {
+		return sort(list, null);
+	}
+
 	/**
 	 * 针对List排序，排序会修改原List
 	 *
 	 * @param <T>  元素类型
 	 * @param list 被排序的List
-	 * @param c    {@link Comparator}
+	 * @param c    {@link Comparator}，null表示自然排序（null安全的）
 	 * @return 原list
 	 * @see Collections#sort(List, Comparator)
 	 */
-	public static <T> List<T> sort(final List<T> list, final Comparator<? super T> c) {
+	@SuppressWarnings("unchecked")
+	public static <T> List<T> sort(final List<T> list, Comparator<? super T> c) {
 		if (CollUtil.isEmpty(list)) {
 			return list;
 		}
+		if(null == c){
+			c = Comparator.nullsFirst((Comparator<? super T>) Comparator.naturalOrder());
+		}
 		list.sort(c);
 		return list;
 	}

hutool-core/src/test/java/cn/hutool/core/stream/EasyStreamTest.java

@@ -181,7 +181,9 @@ public class EasyStreamTest {
 		final List<Integer> distinctBy2 = EasyStream.of(list).parallel().distinct(String::valueOf).toList();
 
 		Assert.assertEquals(collect1, distinctBy1);
-		Assert.assertEquals(collect2, distinctBy2);
+
+		// 并行流测试
+		Assert.assertEquals(ListUtil.sort(collect2), ListUtil.sort(distinctBy2));
 
 		Assert.assertEquals(
 				4, EasyStream.of(1, 2, 2, null, 3, null).parallel(true).distinct(t -> Objects.isNull(t) ? null : t.toString()).sequential().count()