test: 补充知识处理、检索与 Agent 回归用例

覆盖切块、向量检索、工具调用和历史预算；模型相关用例使用桩。

backend/tests/core/test_edition.py

@@ -0,0 +1,53 @@
+"""
+Copyright 2024-2026 ReplyPier
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+"""
+
+import sys
+
+import pytest
+
+from app.core import edition
+
+
+@pytest.fixture
+def clean_meta_path():
+    saved = list(sys.meta_path)
+    yield
+    sys.meta_path[:] = saved
+
+
+def _blockers():
+    return [f for f in sys.meta_path if isinstance(f, edition._BlockEnterprise)]
+
+
+def test_apply_without_flag_installs_nothing(monkeypatch, clean_meta_path):
+    monkeypatch.delenv("NO_ENTERPRISE", raising=False)
+    sys.meta_path[:] = [f for f in sys.meta_path if not isinstance(f, edition._BlockEnterprise)]
+
+    edition.apply()
+
+    assert _blockers() == []
+
+
+def test_apply_with_flag_blocks_enterprise_imports_once(monkeypatch, clean_meta_path):
+    monkeypatch.setenv("NO_ENTERPRISE", "1")
+
+    edition.apply()
+    edition.apply()
+
+    assert len(_blockers()) == 1
+    with pytest.raises(ModuleNotFoundError):
+        _blockers()[0].find_spec("app.enterprise.models")
+    assert _blockers()[0].find_spec("app.models") is None