diff --git a/hutool-core/src/test/java/cn/hutool/core/collection/CollStreamUtilTest.java b/hutool-core/src/test/java/cn/hutool/core/collection/CollStreamUtilTest.java
index 63d5faa56..7c95075af 100644
--- a/hutool-core/src/test/java/cn/hutool/core/collection/CollStreamUtilTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/collection/CollStreamUtilTest.java
@@ -203,6 +203,20 @@ public class CollStreamUtilTest {
 				groupThen);
 
 		// 总之，如果你是想要group分组后还要进行别的操作，用它就对了！
+		// 并且对null值进行了友好处理，例如
+		List<Student> students = Arrays.asList(null, null, new Student(1, 1, 1, "张三"),
+				new Student(1, 2, 1, "李四"));
+		Map<Long, List<Student>> termIdStudentsMap = CollStreamUtil.groupBy(students, Student::getTermId, Collectors.toList());
+		Map<Long, List<Student>> termIdStudentsCompareMap = new HashMap<>();
+		termIdStudentsCompareMap.put(null, Arrays.asList(null, null));
+		termIdStudentsCompareMap.put(1L, Arrays.asList(new Student(1L, 1, 1, "张三"), new Student(1L, 2, 1, "李四")));
+		Assert.assertEquals(termIdStudentsCompareMap, termIdStudentsMap);
+
+		Map<Long, Long> termIdCountMap = CollStreamUtil.groupBy(students, Student::getTermId, Collectors.counting());
+		Map<Long, Long> termIdCountCompareMap = new HashMap<>();
+		termIdCountCompareMap.put(null, 2L);
+		termIdCountCompareMap.put(1L, 2L);
+		Assert.assertEquals(termIdCountCompareMap, termIdCountMap);
 	}