refactor streaming accumulation and chat history UI

tests/node/chat-history-utils.test.js

@@ -0,0 +1,60 @@
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+async function loadUtils() {
+  return import('../../webui/src/features/chatHistory/chatHistoryUtils.js');
+}
+
+test('chat history strict parser merges current input file placeholder', async () => {
+  const {
+    buildListModeMessages,
+  } = await loadUtils();
+  const t = (key) => key;
+  const item = {
+    messages: [{
+      role: 'user',
+      content: 'Continue from the latest state in the attached DS2API_HISTORY.txt context. Treat it as the current working state and answer the latest user request directly.',
+    }],
+    history_text: [
+      '<｜begin▁of▁sentence｜>',
+      '<｜User｜>hello',
+      '<｜Assistant｜>hi<｜end▁of▁sentence｜>',
+    ].join(''),
+  };
+
+  const result = buildListModeMessages(item, t);
+  assert.equal(result.historyMerged, true);
+  assert.deepEqual(result.messages, [
+    { role: 'user', content: 'hello' },
+    { role: 'assistant', content: 'hi' },
+  ]);
+});
+
+test('chat history strict parser inserts history after system messages', async () => {
+  const {
+    buildListModeMessages,
+  } = await loadUtils();
+  const t = (key) => key;
+  const item = {
+    messages: [
+      { role: 'system', content: 'policy' },
+      { role: 'user', content: 'latest' },
+    ],
+    history_text: [
+      '<｜begin▁of▁sentence｜>',
+      '<｜User｜>old',
+      '<｜Assistant｜>done<｜end▁of▁sentence｜>',
+    ].join(''),
+  };
+
+  const result = buildListModeMessages(item, t);
+  assert.equal(result.historyMerged, true);
+  assert.deepEqual(result.messages, [
+    { role: 'system', content: 'policy' },
+    { role: 'user', content: 'old' },
+    { role: 'assistant', content: 'done' },
+    { role: 'user', content: 'latest' },
+  ]);
+});