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Add tests for covering additional, important scenarios of CollStreamUtil.

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qibinhang
2025-08-08 13:18:32 +08:00
parent b580030b5b
commit 3e330f1c64
1 changed files with 34 additions and 0 deletions
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34
hutool-core/src/test/java/cn/hutool/core/collection/CollStreamUtilTest.java
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@@ -60,6 +60,40 @@ public class CollStreamUtilTest {
assertNull(map.get(4L));
}
@Test
public void testToMap_KeyCollision_SilentlyOverwrite() {
List<Student> list = new ArrayList<>();
list.add(new Student(1, 101, 1, "张三"));
list.add(new Student(1, 102, 1, "李四"));
Map<Long, String> map = CollStreamUtil.toMap(list, Student::getStudentId, Student::getName, false);
assertEquals(1, map.size());
assertEquals("李四", map.get(1L)); // 确保后面的值覆盖前面的
}
@Test
public void testToMap_NullKeyOrValue() {
List<Student> list = new ArrayList<>();
list.add(new Student(1, 1, 1L, "张三"));
list.add(null);
list.add(new Student(1, 2, 2L, null));
assertThrows(NullPointerException.class, () -> {
CollStreamUtil.toMap(list, Student::getStudentId, Student::getName);
});
}
@Test
public void testToMap_LargeInputPerformance() {
List<Student> list = new ArrayList<>();
for (long i = 0; i < 10000; i++) {
list.add(new Student(1, 1, i, "学生" + i));
}
Map<Long, String> map = CollStreamUtil.toMap(list, Student::getStudentId, Student::getName);
assertEquals(10000, map.size());
}
@Test
public void testGroupByKey() {
Map<Long, List<Student>> map = CollStreamUtil.groupByKey(null, Student::getClassId);