test(tool): improve map assertion to verify key-value mapping

Change-Id: I5c6222720bb9ed62e770f1c8d884a4e97e427973
Co-developed-by: Cursor <noreply@cursor.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

Author: LearningGp

agentscope-core/src/test/java/io/agentscope/core/tool/ToolMethodInvokerTest.java

@@ -742,10 +742,10 @@ void testGenericMap_WithCustomClassValue() throws Exception {
         Assertions.assertFalse(
                 ToolTestUtils.isErrorResponse(response), "Should not fail with ClassCastException");
         String content = ToolTestUtils.extractContent(response);
-        // The order of map entries is not guaranteed, so check for both possibilities
+        // The order of map entries is not guaranteed, so check that both key-value pairs are present.
         Assertions.assertTrue(
-                content.contains("ProductA") && content.contains("ProductB"),
-                "Response should contain both product names");
+                content.contains("key1=ProductA") && content.contains("key2=ProductB"),
+                "Response should contain both key-value pairs. Actual: " + content);
     }
 
     /** Test nested generic types like List<List<Integer>>. */