Move ListHashUtil hash test to core

Author: Weilong-Qin

agentscope-core/src/test/java/io/agentscope/core/session/ListHashUtilTest.java

@@ -55,6 +55,55 @@ void testComputeHashSameListSameHash() {
         assertEquals(hash1, hash2);
     }
 
+    @Test
+    void testComputeHashEquivalentMessageLists() {
+        List<Msg> first =
+                List.of(
+                        Msg.builder()
+                                .id("m-user-1")
+                                .timestamp("2026-05-08 14:00:00.000")
+                                .role(MsgRole.USER)
+                                .content(TextBlock.builder().text("hello").build())
+                                .build(),
+                        Msg.builder()
+                                .id("m-assistant-1")
+                                .timestamp("2026-05-08 14:00:01.000")
+                                .role(MsgRole.ASSISTANT)
+                                .content(TextBlock.builder().text("hello").build())
+                                .build());
+
+        List<Msg> second =
+                List.of(
+                        Msg.builder()
+                                .id("m-user-1")
+                                .timestamp("2026-05-08 14:00:00.000")
+                                .role(MsgRole.USER)
+                                .content(TextBlock.builder().text("hello").build())
+                                .build(),
+                        Msg.builder()
+                                .id("m-assistant-1")
+                                .timestamp("2026-05-08 14:00:01.000")
+                                .role(MsgRole.ASSISTANT)
+                                .content(TextBlock.builder().text("hello").build())
+                                .build());
+
+        String h1 = ListHashUtil.computeHash(first);
+        String h2 = ListHashUtil.computeHash(second);
+
+        assertEquals(h1, h2);
+    }
+
+    @Test
+    void testComputeHashListWithNullItem() {
+        List<Msg> list = new ArrayList<>();
+        list.add(null);
+
+        String hash1 = ListHashUtil.computeHash(list);
+        String hash2 = ListHashUtil.computeHash(list);
+
+        assertEquals(hash1, hash2);
+    }
+
     @Test
     void testComputeHashListModifiedDifferentHash() {
         List<Msg> list = createMsgList(5);

agentscope-extensions/agentscope-extensions-session-mysql/src/test/java/io/agentscope/core/session/mysql/MysqlSessionTest.java

@@ -25,10 +25,6 @@
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
-import io.agentscope.core.message.Msg;
-import io.agentscope.core.message.MsgRole;
-import io.agentscope.core.message.TextBlock;
-import io.agentscope.core.session.ListHashUtil;
 import io.agentscope.core.state.SessionKey;
 import io.agentscope.core.state.SimpleSessionKey;
 import io.agentscope.core.state.State;
@@ -286,45 +282,6 @@ void testSaveAndGetListState() throws SQLException {
         assertEquals("value2", loaded.get(1).value());
     }
 
-    @Test
-    @DisplayName("Should compute same hash for equivalent message lists")
-    void testComputeHashEquivalentMessageLists() {
-        List<Msg> first =
-                List.of(
-                        Msg.builder()
-                                .id("m-user-1")
-                                .timestamp("2026-05-08 14:00:00.000")
-                                .role(MsgRole.USER)
-                                .content(TextBlock.builder().text("hello").build())
-                                .build(),
-                        Msg.builder()
-                                .id("m-assistant-1")
-                                .timestamp("2026-05-08 14:00:01.000")
-                                .role(MsgRole.ASSISTANT)
-                                .content(TextBlock.builder().text("hello").build())
-                                .build());
-
-        List<Msg> second =
-                List.of(
-                        Msg.builder()
-                                .id("m-user-1")
-                                .timestamp("2026-05-08 14:00:00.000")
-                                .role(MsgRole.USER)
-                                .content(TextBlock.builder().text("hello").build())
-                                .build(),
-                        Msg.builder()
-                                .id("m-assistant-1")
-                                .timestamp("2026-05-08 14:00:01.000")
-                                .role(MsgRole.ASSISTANT)
-                                .content(TextBlock.builder().text("hello").build())
-                                .build());
-
-        String h1 = ListHashUtil.computeHash(first);
-        String h2 = ListHashUtil.computeHash(second);
-
-        assertEquals(h1, h2);
-    }
-
     @Test
     @DisplayName("Should commit incremental list save when connection auto-commit is disabled")
     void testSaveListIncrementalAppendCommitsWhenAutoCommitDisabled() throws SQLException {