diff --git a/packages/adapters/in_memory/user_repository.py b/packages/adapters/in_memory/user_repository.py
index e892f0889..68db1479c 100755
--- a/packages/adapters/in_memory/user_repository.py
+++ b/packages/adapters/in_memory/user_repository.py
@@ -23,6 +23,23 @@ class InMemoryUserRepository(UserRepository):
 
     def save(self, user: User) -> None:
         """保存用户"""
+        # 如果是更新，先清理旧索引
+        old = self._users.get(user.id)
+        if old:
+            self._email_index.pop(old.email.lower(), None)
+            if old.username:
+                self._username_index.pop(old.username.lower(), None)
+            if old.email_verification_token:
+                self._verification_token_index.pop(old.email_verification_token, None)
+            if old.password_reset_token:
+                self._reset_token_index.pop(old.password_reset_token, None)
+            if old.wechat_openid:
+                self._wechat_openid_index.pop(old.wechat_openid, None)
+            if old.wechat_unionid:
+                self._wechat_unionid_index.pop(old.wechat_unionid, None)
+            if old.phone:
+                self._phone_index.pop(old.phone, None)
+
         self._users[user.id] = user
         self._email_index[user.email.lower()] = user.id
         if user.username:
diff --git a/tests/unit/test_inmemory_asset_repository.py b/tests/unit/test_inmemory_asset_repository.py
new file mode 100755
index 000000000..d9db450b2
--- /dev/null
+++ b/tests/unit/test_inmemory_asset_repository.py
@@ -0,0 +1,401 @@
+"""InMemoryAssetRepository 单元测试."""
+
+import pytest
+
+from packages.adapters.in_memory.asset_repository import InMemoryAssetRepository
+from packages.domain.entities import Asset, AssetStatus, ClassificationStatus
+
+
+@pytest.fixture
+def repo() -> InMemoryAssetRepository:
+    return InMemoryAssetRepository()
+
+
+@pytest.fixture
+def sample_asset() -> Asset:
+    return Asset.create(
+        project_id="proj-1",
+        library_id="lib-1",
+        name="test.mp4",
+        storage_key="storage/key1",
+        mime_type="video/mp4",
+        file_size=1024,
+        file_hash="hash-abc",
+    )
+
+
+@pytest.fixture
+def asset2() -> Asset:
+    return Asset.create(
+        project_id="proj-1",
+        library_id="lib-1",
+        name="test2.jpg",
+        storage_key="storage/key2",
+        mime_type="image/jpeg",
+        file_size=512,
+        file_hash="hash-def",
+    )
+
+
+@pytest.fixture
+def asset_other_project() -> Asset:
+    return Asset.create(
+        project_id="proj-2",
+        library_id="lib-2",
+        name="other.mp3",
+        storage_key="storage/key3",
+        mime_type="audio/mpeg",
+        file_size=256,
+        file_hash="hash-ghi",
+    )
+
+
+class TestCreateAndGet:
+    def test_create_returns_asset(self, repo, sample_asset):
+        result = repo.create(sample_asset)
+        assert result.id == sample_asset.id
+        assert result.name == "test.mp4"
+
+    def test_get_existing_asset(self, repo, sample_asset):
+        repo.create(sample_asset)
+        result = repo.get(sample_asset.id)
+        assert result is not None
+        assert result.id == sample_asset.id
+
+    def test_get_nonexistent_returns_none(self, repo):
+        assert repo.get("nonexistent") is None
+
+    def test_find_by_id_same_as_get(self, repo, sample_asset):
+        repo.create(sample_asset)
+        assert repo.find_by_id(sample_asset.id).id == repo.get(sample_asset.id).id
+
+
+class TestListByProject:
+    def test_list_by_project_filters_correctly(self, repo, sample_asset, asset2, asset_other_project):
+        repo.create(sample_asset)
+        repo.create(asset2)
+        repo.create(asset_other_project)
+
+        proj1 = repo.list_by_project("proj-1")
+        assert len(proj1) == 2
+        assert all(a.project_id == "proj-1" for a in proj1)
+
+        proj2 = repo.list_by_project("proj-2")
+        assert len(proj2) == 1
+        assert proj2[0].id == asset_other_project.id
+
+    def test_list_by_project_empty(self, repo):
+        assert repo.list_by_project("nonexistent") == []
+
+
+class TestListByLibrary:
+    def test_list_by_library_filters_correctly(self, repo, sample_asset, asset2, asset_other_project):
+        repo.create(sample_asset)
+        repo.create(asset2)
+        repo.create(asset_other_project)
+
+        lib1 = repo.list_by_library("lib-1")
+        assert len(lib1) == 2
+
+        lib2 = repo.list_by_library("lib-2")
+        assert len(lib2) == 1
+        assert lib2[0].id == asset_other_project.id
+
+    def test_find_by_library_is_alias(self, repo, sample_asset):
+        repo.create(sample_asset)
+        assert repo.find_by_library("lib-1") == repo.list_by_library("lib-1")
+
+    def test_list_by_library_empty(self, repo):
+        assert repo.list_by_library("nonexistent") == []
+
+
+class TestFindByLibraryAndFileType:
+    def test_filter_by_video(self, repo, sample_asset, asset2, asset_other_project):
+        repo.create(sample_asset)
+        repo.create(asset2)
+        repo.create(asset_other_project)
+
+        videos = repo.find_by_library_and_file_type("lib-1", "video")
+        assert len(videos) == 1
+        assert videos[0].mime_type.startswith("video/")
+
+    def test_filter_by_image(self, repo, sample_asset, asset2):
+        repo.create(sample_asset)
+        repo.create(asset2)
+
+        images = repo.find_by_library_and_file_type("lib-1", "image")
+        assert len(images) == 1
+        assert images[0].mime_type.startswith("image/")
+
+    def test_filter_by_audio(self, repo, sample_asset, asset_other_project):
+        repo.create(sample_asset)
+        repo.create(asset_other_project)
+
+        audio = repo.find_by_library_and_file_type("lib-2", "audio")
+        assert len(audio) == 1
+
+    def test_empty_result(self, repo, sample_asset):
+        repo.create(sample_asset)
+        assert repo.find_by_library_and_file_type("lib-1", "audio") == []
+
+
+class TestUpdate:
+    def test_update_existing_asset(self, repo, sample_asset):
+        repo.create(sample_asset)
+        sample_asset.name = "updated.mp4"
+        sample_asset.file_size = 2048
+
+        result = repo.update(sample_asset)
+        assert result.name == "updated.mp4"
+        assert result.file_size == 2048
+
+        fetched = repo.get(sample_asset.id)
+        assert fetched.name == "updated.mp4"
+
+    def test_update_nonexistent_creates(self, repo, sample_asset):
+        """update 直接覆盖，不存在则相当于 create."""
+        result = repo.update(sample_asset)
+        assert result.id == sample_asset.id
+        assert repo.get(sample_asset.id) is not None
+
+
+class TestDelete:
+    def test_delete_existing(self, repo, sample_asset):
+        repo.create(sample_asset)
+        assert repo.delete(sample_asset.id) is True
+        assert repo.get(sample_asset.id) is None
+
+    def test_delete_nonexistent(self, repo):
+        assert repo.delete("nonexistent") is False
+
+
+class TestBatchDelete:
+    def test_batch_delete_soft_delete(self, repo, sample_asset, asset2):
+        repo.create(sample_asset)
+        repo.create(asset2)
+
+        count = repo.batch_delete([sample_asset.id, asset2.id])
+        assert count == 2
+
+        a1 = repo.get(sample_asset.id)
+        a2 = repo.get(asset2.id)
+        assert a1.status == AssetStatus.DELETED
+        assert a2.status == AssetStatus.DELETED
+        assert a1.updated_at is not None
+        assert a2.updated_at is not None
+
+    def test_batch_delete_skip_already_deleted(self, repo, sample_asset):
+        repo.create(sample_asset)
+        sample_asset.status = AssetStatus.DELETED
+        repo.update(sample_asset)
+
+        count = repo.batch_delete([sample_asset.id])
+        assert count == 0
+
+    def test_batch_delete_nonexistent(self, repo):
+        count = repo.batch_delete(["nonexistent-1", "nonexistent-2"])
+        assert count == 0
+
+    def test_batch_delete_partial(self, repo, sample_asset):
+        repo.create(sample_asset)
+        count = repo.batch_delete([sample_asset.id, "nonexistent"])
+        assert count == 1
+
+
+class TestBatchUpdateMetadata:
+    def test_batch_update_metadata_merge(self, repo, sample_asset, asset2):
+        sample_asset.metadata = {"key1": "val1"}
+        repo.create(sample_asset)
+        repo.create(asset2)
+
+        count = repo.batch_update_metadata(
+            [sample_asset.id, asset2.id],
+            {"key2": "val2"},
+        )
+        assert count == 2
+
+        a1 = repo.get(sample_asset.id)
+        a2 = repo.get(asset2.id)
+        assert a1.metadata == {"key1": "val1", "key2": "val2"}
+        assert a2.metadata == {"key2": "val2"}
+
+    def test_batch_update_metadata_overwrite_existing_key(self, repo, sample_asset):
+        sample_asset.metadata = {"key1": "old"}
+        repo.create(sample_asset)
+
+        count = repo.batch_update_metadata([sample_asset.id], {"key1": "new"})
+        assert count == 1
+        assert repo.get(sample_asset.id).metadata["key1"] == "new"
+
+    def test_batch_update_metadata_nonexistent(self, repo):
+        count = repo.batch_update_metadata(["nonexistent"], {"key": "val"})
+        assert count == 0
+
+
+class TestBatchAddTags:
+    def test_batch_add_tags_new_tags(self, repo, sample_asset, asset2):
+        repo.create(sample_asset)
+        repo.create(asset2)
+
+        count = repo.batch_add_tags([sample_asset.id, asset2.id], ["tag1", "tag2"])
+        assert count == 2
+
+        a1 = repo.get(sample_asset.id)
+        a2 = repo.get(asset2.id)
+        assert set(a1.tag_ids) == {"tag1", "tag2"}
+        assert set(a2.tag_ids) == {"tag1", "tag2"}
+
+    def test_batch_add_tags_dedup(self, repo, sample_asset):
+        sample_asset.tag_ids = ["tag1"]
+        repo.create(sample_asset)
+
+        count = repo.batch_add_tags([sample_asset.id], ["tag1", "tag2"])
+        assert count == 1  # tag1已存在，但tag2新增，所以有变化
+
+        tags = repo.get(sample_asset.id).tag_ids
+        assert tags.count("tag1") == 1
+        assert "tag2" in tags
+
+    def test_batch_add_tags_no_change_when_all_exist(self, repo, sample_asset):
+        sample_asset.tag_ids = ["tag1", "tag2"]
+        repo.create(sample_asset)
+
+        count = repo.batch_add_tags([sample_asset.id], ["tag1", "tag2"])
+        assert count == 0  # 没有变化
+
+    def test_batch_add_tags_nonexistent_assets(self, repo):
+        count = repo.batch_add_tags(["nonexistent"], ["tag1"])
+        assert count == 0
+
+
+class TestBatchReplaceTags:
+    def test_batch_replace_tags_override(self, repo, sample_asset):
+        sample_asset.tag_ids = ["old1", "old2"]
+        repo.create(sample_asset)
+
+        count = repo.batch_replace_tags([sample_asset.id], ["new1", "new2", "new3"])
+        assert count == 1
+
+        tags = repo.get(sample_asset.id).tag_ids
+        assert tags == ["new1", "new2", "new3"]
+
+    def test_batch_replace_tags_empty(self, repo, sample_asset):
+        sample_asset.tag_ids = ["tag1"]
+        repo.create(sample_asset)
+
+        count = repo.batch_replace_tags([sample_asset.id], [])
+        assert count == 1
+        assert repo.get(sample_asset.id).tag_ids == []
+
+    def test_batch_replace_tags_nonexistent(self, repo):
+        count = repo.batch_replace_tags(["nonexistent"], ["tag1"])
+        assert count == 0
+
+
+class TestFindByProjectPagination:
+    @pytest.fixture
+    def five_assets(self, repo):
+        assets = []
+        for i in range(5):
+            a = Asset.create(
+                project_id="proj-paged",
+                library_id="lib-paged",
+                name=f"asset-{i}.mp4",
+                storage_key=f"key-{i}",
+                mime_type="video/mp4",
+            )
+            repo.create(a)
+            assets.append(a)
+        return assets
+
+    def test_find_by_project_default_pagination(self, repo, five_assets):
+        result = repo.find_by_project("proj-paged")
+        assert len(result) == 5
+
+    def test_find_by_project_skip(self, repo, five_assets):
+        result = repo.find_by_project("proj-paged", skip=2)
+        assert len(result) == 3
+
+    def test_find_by_project_limit(self, repo, five_assets):
+        result = repo.find_by_project("proj-paged", limit=2)
+        assert len(result) == 2
+
+    def test_find_by_project_skip_and_limit(self, repo, five_assets):
+        result = repo.find_by_project("proj-paged", skip=1, limit=2)
+        assert len(result) == 2
+
+    def test_find_by_project_skip_past_end(self, repo, five_assets):
+        result = repo.find_by_project("proj-paged", skip=10)
+        assert result == []
+
+    def test_find_by_project_empty(self, repo):
+        assert repo.find_by_project("nonexistent") == []
+
+
+class TestFindByTagIds:
+    def test_find_by_tag_ids_match_all(self, repo, sample_asset, asset2):
+        sample_asset.tag_ids = ["tag1", "tag2", "tag3"]
+        asset2.tag_ids = ["tag1", "tag2"]
+        repo.create(sample_asset)
+        repo.create(asset2)
+
+        result = repo.find_by_tag_ids(["tag1", "tag2"])
+        assert len(result) == 2
+
+    def test_find_by_tag_ids_subset_match(self, repo, sample_asset, asset2):
+        sample_asset.tag_ids = ["tag1", "tag2"]
+        asset2.tag_ids = ["tag1"]
+        repo.create(sample_asset)
+        repo.create(asset2)
+
+        result = repo.find_by_tag_ids(["tag1", "tag2"])
+        assert len(result) == 1
+        assert result[0].id == sample_asset.id
+
+    def test_find_by_tag_ids_empty_tag_list(self, repo, sample_asset):
+        sample_asset.tag_ids = ["tag1"]
+        repo.create(sample_asset)
+        assert repo.find_by_tag_ids([]) == []
+
+    def test_find_by_tag_ids_no_match(self, repo, sample_asset):
+        sample_asset.tag_ids = ["tag1"]
+        repo.create(sample_asset)
+        assert repo.find_by_tag_ids(["tag999"]) == []
+
+    def test_find_by_tag_ids_pagination(self, repo):
+        for i in range(5):
+            a = Asset.create(
+                project_id="p1",
+                library_id="l1",
+                name=f"a{i}.mp4",
+                storage_key=f"k{i}",
+                mime_type="video/mp4",
+            )
+            a.tag_ids = ["shared-tag"]
+            repo.create(a)
+
+        result = repo.find_by_tag_ids(["shared-tag"], skip=1, limit=2)
+        assert len(result) == 2
+
+
+class TestFindByLibraryAndFileHash:
+    def test_find_by_hash_match(self, repo, sample_asset):
+        repo.create(sample_asset)
+        result = repo.find_by_library_and_file_hash("lib-1", "hash-abc")
+        assert result is not None
+        assert result.id == sample_asset.id
+
+    def test_find_by_hash_wrong_library(self, repo, sample_asset):
+        repo.create(sample_asset)
+        result = repo.find_by_library_and_file_hash("lib-2", "hash-abc")
+        assert result is None
+
+    def test_find_by_hash_wrong_hash(self, repo, sample_asset):
+        repo.create(sample_asset)
+        result = repo.find_by_library_and_file_hash("lib-1", "hash-wrong")
+        assert result is None
+
+    def test_find_by_hash_empty_hash(self, repo, sample_asset):
+        repo.create(sample_asset)
+        result = repo.find_by_library_and_file_hash("lib-1", "")
+        assert result is None
diff --git a/tests/unit/test_inmemory_user_repository.py b/tests/unit/test_inmemory_user_repository.py
new file mode 100755
index 000000000..f7298c489
--- /dev/null
+++ b/tests/unit/test_inmemory_user_repository.py
@@ -0,0 +1,191 @@
+"""InMemoryUserRepository 单元测试."""
+
+from datetime import datetime, timezone
+
+import pytest
+
+from packages.adapters.in_memory.user_repository import InMemoryUserRepository
+from packages.domain.entities import User
+
+
+@pytest.fixture
+def repo() -> InMemoryUserRepository:
+    return InMemoryUserRepository()
+
+
+@pytest.fixture
+def sample_user() -> User:
+    return User(
+        id="user-1",
+        email="Test@Example.com",
+        display_name="Test User",
+        username="testuser",
+        password_hash="hashed-pw",
+        email_verification_token="verify-token-123",
+        password_reset_token="reset-token-456",
+        wechat_openid="wx-openid-abc",
+        wechat_unionid="wx-unionid-def",
+        phone="13800138000",
+        created_at=datetime.now(timezone.utc),
+    )
+
+
+class TestSaveAndFindById:
+    def test_save_and_find_by_id(self, repo, sample_user):
+        repo.save(sample_user)
+        found = repo.find_by_id("user-1")
+        assert found is not None
+        assert found.id == "user-1"
+        assert found.email == "Test@Example.com"
+
+    def test_find_by_id_not_found(self, repo):
+        assert repo.find_by_id("nonexistent") is None
+
+    def test_save_overwrite_existing(self, repo, sample_user):
+        repo.save(sample_user)
+        sample_user.display_name = "Updated Name"
+        repo.save(sample_user)
+
+        found = repo.find_by_id("user-1")
+        assert found.display_name == "Updated Name"
+
+
+class TestFindByEmail:
+    def test_find_by_email_case_insensitive(self, repo, sample_user):
+        repo.save(sample_user)
+        # 用不同大小写查找
+        found = repo.find_by_email("test@example.com")
+        assert found is not None
+        assert found.id == "user-1"
+
+    def test_find_by_email_exact_case(self, repo, sample_user):
+        repo.save(sample_user)
+        found = repo.find_by_email("Test@Example.com")
+        assert found is not None
+
+    def test_find_by_email_not_found(self, repo):
+        assert repo.find_by_email("notfound@example.com") is None
+
+
+class TestFindByUsername:
+    def test_find_by_username_case_insensitive(self, repo, sample_user):
+        repo.save(sample_user)
+        found = repo.find_by_username("TESTUSER")
+        assert found is not None
+        assert found.id == "user-1"
+
+    def test_find_by_username_not_found(self, repo):
+        assert repo.find_by_username("nobody") is None
+
+    def test_find_by_username_empty(self, repo, sample_user):
+        sample_user.username = ""
+        repo.save(sample_user)
+        # 空 username 不应该建立索引，但查找空字符串应该返回None
+        found = repo.find_by_username("")
+        assert found is None
+
+
+class TestFindByVerificationToken:
+    def test_find_by_verification_token(self, repo, sample_user):
+        repo.save(sample_user)
+        found = repo.find_by_verification_token("verify-token-123")
+        assert found is not None
+        assert found.id == "user-1"
+
+    def test_find_by_verification_token_not_found(self, repo):
+        assert repo.find_by_verification_token("bad-token") is None
+
+
+class TestFindByPasswordResetToken:
+    def test_find_by_password_reset_token(self, repo, sample_user):
+        repo.save(sample_user)
+        found = repo.find_by_password_reset_token("reset-token-456")
+        assert found is not None
+        assert found.id == "user-1"
+
+    def test_find_by_password_reset_token_not_found(self, repo):
+        assert repo.find_by_password_reset_token("bad-token") is None
+
+
+class TestFindByWechat:
+    def test_find_by_wechat_openid(self, repo, sample_user):
+        repo.save(sample_user)
+        found = repo.find_by_wechat_openid("wx-openid-abc")
+        assert found is not None
+        assert found.id == "user-1"
+
+    def test_find_by_wechat_openid_not_found(self, repo):
+        assert repo.find_by_wechat_openid("bad-openid") is None
+
+    def test_find_by_wechat_unionid(self, repo, sample_user):
+        repo.save(sample_user)
+        found = repo.find_by_wechat_unionid("wx-unionid-def")
+        assert found is not None
+        assert found.id == "user-1"
+
+    def test_find_by_wechat_unionid_not_found(self, repo):
+        assert repo.find_by_wechat_unionid("bad-unionid") is None
+
+    def test_find_by_wechat_unionid_empty(self, repo, sample_user):
+        sample_user.wechat_unionid = None
+        repo.save(sample_user)
+        assert repo.find_by_wechat_unionid("") is None
+
+
+class TestFindByPhone:
+    def test_find_by_phone(self, repo, sample_user):
+        repo.save(sample_user)
+        found = repo.find_by_phone("13800138000")
+        assert found is not None
+        assert found.id == "user-1"
+
+    def test_find_by_phone_not_found(self, repo):
+        assert repo.find_by_phone("13900139000") is None
+
+    def test_find_by_phone_empty(self, repo, sample_user):
+        sample_user.phone = None
+        repo.save(sample_user)
+        assert repo.find_by_phone("") is None
+
+
+class TestDelete:
+    def test_delete_existing_user(self, repo, sample_user):
+        repo.save(sample_user)
+        assert repo.delete("user-1") is True
+        assert repo.find_by_id("user-1") is None
+
+    def test_delete_cleans_all_indexes(self, repo, sample_user):
+        repo.save(sample_user)
+        repo.delete("user-1")
+
+        assert repo.find_by_email("test@example.com") is None
+        assert repo.find_by_username("testuser") is None
+        assert repo.find_by_verification_token("verify-token-123") is None
+        assert repo.find_by_password_reset_token("reset-token-456") is None
+
+    def test_delete_nonexistent_user(self, repo):
+        assert repo.delete("nonexistent") is False
+
+    def test_delete_twice_returns_false(self, repo, sample_user):
+        repo.save(sample_user)
+        assert repo.delete("user-1") is True
+        assert repo.delete("user-1") is False
+
+
+class TestIndexUpdates:
+    def test_save_new_user_with_same_email_overwrites_index(self, repo, sample_user):
+        """不同用户同邮箱，后者覆盖索引."""
+        repo.save(sample_user)
+        user2 = User(
+            id="user-2",
+            email="test@example.com",  # 同邮箱不同大小写
+            display_name="User 2",
+            username="user2",
+        )
+        repo.save(user2)
+
+        # 邮箱索引指向最后保存的用户
+        found = repo.find_by_email("test@example.com")
+        assert found.id == "user-2"
+        # 原用户仍然可通过ID找到
+        assert repo.find_by_id("user-1") is not None
diff --git a/tests/unit/test_path_security.py b/tests/unit/test_path_security.py
index b388130c4..6acf205c3 100755
--- a/tests/unit/test_path_security.py
+++ b/tests/unit/test_path_security.py
@@ -1,18 +1,14 @@
-"""路径安全校验工具单元测试 — 路径遍历防护."""
-
-from __future__ import annotations
+"""path_security 单元测试."""
 
 import os
-import sys
 import tempfile
-import unittest
-from pathlib import Path
 
-sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "..", "apps", "worker"))
+import pytest
 
-from video_processing.path_security import (  # noqa: E402
+from apps.worker.video_processing.path_security import (
+    LOCAL_SCHEMA_PREFIX,
+    MAX_PATH_LENGTH,
     PathSecurityError,
-    get_allowed_local_dirs,
     is_in_allowed_dirs,
     is_path_safe,
     safe_resolve_path,
@@ -21,223 +17,242 @@ from video_processing.path_security import (  # noqa: E402
 )
 
 
-class TestSafeResolvePath(unittest.TestCase):
-    """安全路径解析测试."""
-
-    def setUp(self):
-        self.tmpdir = tempfile.mkdtemp()
-
-    def tearDown(self):
-        import shutil
-
-        shutil.rmtree(self.tmpdir, ignore_errors=True)
-
-    # ── 正常路径 ─────────────────────────────────────────────────────────
-
-    def test_simple_relative_path(self):
-        """简单相对路径应该正常解析."""
-        result = safe_resolve_path("test.mp4", self.tmpdir)
-        self.assertEqual(result.name, "test.mp4")
-        self.assertTrue(str(result).startswith(self.tmpdir))
-
-    def test_subdirectory_path(self):
-        """子目录路径应该正常解析."""
-        result = safe_resolve_path("sub/dir/file.mp4", self.tmpdir)
-        self.assertTrue(str(result).startswith(self.tmpdir))
-        self.assertIn("sub/dir/file.mp4", str(result).replace("\\", "/"))
-
-    def test_dot_slash_path(self):
-        """./ 开头的路径应该正常解析."""
-        result = safe_resolve_path("./test.mp4", self.tmpdir)
-        self.assertEqual(result.name, "test.mp4")
-
-    # ── 路径遍历防护 ─────────────────────────────────────────────────────
-
-    def test_parent_traversal_rejected(self):
-        """../ 路径遍历应该被拒绝."""
-        with self.assertRaises(PathSecurityError):
-            safe_resolve_path("../etc/passwd", self.tmpdir)
-
-    def test_multiple_parent_traversal_rejected(self):
-        """多级 ../ 遍历应该被拒绝."""
-        with self.assertRaises(PathSecurityError):
-            safe_resolve_path("../../etc/passwd", self.tmpdir)
-
-    def test_mixed_traversal_rejected(self):
-        """混合路径遍历应该被拒绝."""
-        with self.assertRaises(PathSecurityError):
-            safe_resolve_path("./sub/../../etc/shadow", self.tmpdir)
-
-    def test_absolute_path_rejected(self):
-        """绝对路径（超出基目录）应该被拒绝."""
-        with self.assertRaises(PathSecurityError):
-            safe_resolve_path("/etc/passwd", self.tmpdir)
-
-    # ── 空字节注入 ───────────────────────────────────────────────────────
-
-    def test_null_byte_rejected(self):
-        """空字节注入应该被拒绝."""
-        with self.assertRaises(PathSecurityError):
-            safe_resolve_path("test\x00.mp4", self.tmpdir)
-
-    # ── 空路径 ──────────────────────────────────────────────────────────
-
-    def test_empty_path_rejected(self):
-        """空路径应该被拒绝."""
-        with self.assertRaises(PathSecurityError):
-            safe_resolve_path("", self.tmpdir)
-
-    def test_none_path_rejected(self):
-        """None 路径应该被拒绝."""
-        with self.assertRaises(PathSecurityError):
-            safe_resolve_path(None, self.tmpdir)  # type: ignore
-
-    def test_whitespace_path_rejected(self):
-        """空白路径应该被拒绝."""
-        with self.assertRaises(PathSecurityError):
-            safe_resolve_path("   ", self.tmpdir)
-
-    # ── 路径长度 ────────────────────────────────────────────────────────
-
-    def test_too_long_path_rejected(self):
-        """超长路径应该被拒绝."""
-        long_path = "a" * 5000 + ".mp4"
-        with self.assertRaises(PathSecurityError):
-            safe_resolve_path(long_path, self.tmpdir)
-
-    # ── 系统路径防护 ─────────────────────────────────────────────────────
-
-    def test_proc_path_rejected_when_absolute(self):
-        """/proc/ 路径在绝对路径模式下应该被拒绝（因为超出基目录）."""
-        with self.assertRaises(PathSecurityError):
-            safe_resolve_path("/proc/self/environ", self.tmpdir)
-
-    # ── 扩展名校验 ───────────────────────────────────────────────────────
-
-    def test_extension_whitelist_pass(self):
-        """白名单内的扩展名应该通过."""
-        result = safe_resolve_path(
-            "test.mp4",
-            self.tmpdir,
-            allowed_extensions={".mp4", ".mov"},
-        )
-        self.assertEqual(result.suffix.lower(), ".mp4")
-
-    def test_extension_whitelist_reject(self):
-        """白名单外的扩展名应该被拒绝."""
-        with self.assertRaises(PathSecurityError):
-            safe_resolve_path(
-                "test.exe",
-                self.tmpdir,
-                allowed_extensions={".mp4", ".mov"},
-            )
+@pytest.fixture
+def base_dir():
+    with tempfile.TemporaryDirectory() as tmpdir:
+        # 创建一个子文件用于测试
+        with open(os.path.join(tmpdir, "test.mp4"), "w") as f:
+            f.write("test")
+        subdir = os.path.join(tmpdir, "subdir")
+        os.makedirs(subdir)
+        with open(os.path.join(subdir, "audio.mp3"), "w") as f:
+            f.write("test")
+        yield tmpdir
 
 
-class TestLocalSchemaPath(unittest.TestCase):
-    """local:// schema 路径测试."""
-
-    def setUp(self):
-        self.tmpdir = tempfile.mkdtemp()
-
-    def tearDown(self):
-        import shutil
-
-        shutil.rmtree(self.tmpdir, ignore_errors=True)
-
-    def test_valid_local_schema(self):
-        """有效的 local:// 相对路径应该通过."""
-        # 创建测试文件
-        test_file = Path(self.tmpdir) / "test.mp4"
-        test_file.touch()
-
-        result = validate_local_schema_path("local://test.mp4", self.tmpdir)
-        self.assertTrue(result.exists())
-
-    def test_local_schema_absolute_rejected(self):
-        """local:// + 绝对路径应该被拒绝."""
-        with self.assertRaises(PathSecurityError):
-            validate_local_schema_path("local:///etc/passwd", self.tmpdir)
-
-    def test_local_schema_traversal_rejected(self):
-        """local:// + 路径遍历应该被拒绝."""
-        with self.assertRaises(PathSecurityError):
-            validate_local_schema_path("local://../etc/passwd", self.tmpdir)
-
-    def test_non_local_schema_rejected(self):
-        """非 local:// 开头的路径应该被拒绝."""
-        with self.assertRaises(PathSecurityError):
-            validate_local_schema_path("http://example.com/test", self.tmpdir)
+# ── safe_resolve_path ────────────────────────────────────────────────────────
 
 
-class TestSanitizeFilename(unittest.TestCase):
-    """文件名清理测试."""
+class TestSafeResolvePath:
+    def test_none_path_raises(self, base_dir):
+        with pytest.raises(PathSecurityError, match="不能为空"):
+            safe_resolve_path(None, base_dir)
 
+    def test_empty_string_raises(self, base_dir):
+        with pytest.raises(PathSecurityError, match="不能为空"):
+            safe_resolve_path("", base_dir)
+
+    def test_whitespace_path_raises(self, base_dir):
+        with pytest.raises(PathSecurityError, match="不能为空"):
+            safe_resolve_path("   ", base_dir)
+
+    def test_too_long_path_raises(self, base_dir):
+        long_path = "a" * (MAX_PATH_LENGTH + 1)
+        with pytest.raises(PathSecurityError, match="路径过长"):
+            safe_resolve_path(long_path, base_dir)
+
+    def test_null_byte_raises(self, base_dir):
+        with pytest.raises(PathSecurityError, match="空字节"):
+            safe_resolve_path("file\x00.mp4", base_dir)
+
+    def test_relative_path_within_base(self, base_dir):
+        result = safe_resolve_path("test.mp4", base_dir)
+        assert result.name == "test.mp4"
+        assert str(result).startswith(str(os.path.realpath(base_dir)))
+
+    def test_subdirectory_path(self, base_dir):
+        result = safe_resolve_path("subdir/audio.mp3", base_dir)
+        assert result.name == "audio.mp3"
+        assert "subdir" in str(result)
+
+    def test_parent_traversal_raises(self, base_dir):
+        with pytest.raises(PathSecurityError, match="路径遍历"):
+            safe_resolve_path("../etc/passwd", base_dir)
+
+    def test_nested_parent_traversal_raises(self, base_dir):
+        with pytest.raises(PathSecurityError, match="路径遍历"):
+            safe_resolve_path("subdir/../../etc/passwd", base_dir)
+
+    def test_absolute_path_raises(self, base_dir):
+        with pytest.raises(PathSecurityError, match="绝对路径"):
+            safe_resolve_path("/etc/passwd", base_dir)
+
+    def test_absolute_path_with_allow_outside(self, base_dir):
+        # allow_outside=True 时允许绝对路径（但会被危险路径模式检查）
+        with pytest.raises(PathSecurityError, match="系统路径"):
+            safe_resolve_path("/etc/passwd", base_dir, allow_outside=True)
+
+    def test_local_schema_relative(self, base_dir):
+        result = safe_resolve_path("local://test.mp4", base_dir)
+        assert result.name == "test.mp4"
+        assert str(result).startswith(str(os.path.realpath(base_dir)))
+
+    def test_local_schema_absolute_raises(self, base_dir):
+        with pytest.raises(PathSecurityError, match="绝对路径"):
+            safe_resolve_path("local:///etc/passwd", base_dir)
+
+    def test_local_schema_traversal_raises(self, base_dir):
+        with pytest.raises(PathSecurityError, match="路径遍历"):
+            safe_resolve_path("local://../secret", base_dir)
+
+    def test_invalid_base_dir_raises(self):
+        with pytest.raises(PathSecurityError, match="基路径"):
+            safe_resolve_path("file.txt", "/nonexistent/dir")
+
+    def test_allowed_extensions_valid(self, base_dir):
+        result = safe_resolve_path("test.mp4", base_dir, allowed_extensions={".mp4"})
+        assert result.suffix.lower() == ".mp4"
+
+    def test_allowed_extensions_invalid_raises(self, base_dir):
+        with pytest.raises(PathSecurityError, match="文件类型"):
+            safe_resolve_path("test.mp4", base_dir, allowed_extensions={".mp3"})
+
+    def test_no_extension_restriction(self, base_dir):
+        # allowed_extensions=None 时不检查
+        result = safe_resolve_path("test.mp4", base_dir, allowed_extensions=None)
+        assert result is not None
+
+    def test_path_object_input(self, base_dir):
+        from pathlib import Path
+
+        result = safe_resolve_path(Path("test.mp4"), base_dir)
+        assert result.name == "test.mp4"
+
+    def test_path_object_base_dir(self, base_dir):
+        from pathlib import Path
+
+        result = safe_resolve_path("test.mp4", Path(base_dir))
+        assert result.name == "test.mp4"
+
+
+# ── is_path_safe ────────────────────────────────────────────────────────────
+
+
+class TestIsPathSafe:
+    def test_safe_path_returns_true(self, base_dir):
+        assert is_path_safe("test.mp4", base_dir) is True
+
+    def test_unsafe_path_returns_false(self, base_dir):
+        assert is_path_safe("../etc/passwd", base_dir) is False
+
+    def test_none_returns_false(self, base_dir):
+        assert is_path_safe(None, base_dir) is False
+
+
+# ── validate_local_schema_path ──────────────────────────────────────────────
+
+
+class TestValidateLocalSchemaPath:
+    def test_valid_local_path(self, base_dir):
+        result = validate_local_schema_path("local://test.mp4", base_dir)
+        assert result.name == "test.mp4"
+
+    def test_missing_prefix_raises(self, base_dir):
+        with pytest.raises(PathSecurityError, match="开头"):
+            validate_local_schema_path("test.mp4", base_dir)
+
+    def test_traversal_raises(self, base_dir):
+        with pytest.raises(PathSecurityError):
+            validate_local_schema_path("local://../secret", base_dir)
+
+    def test_absolute_path_raises(self, base_dir):
+        with pytest.raises(PathSecurityError):
+            validate_local_schema_path("local:///etc/passwd", base_dir)
+
+
+# ── sanitize_filename ───────────────────────────────────────────────────────
+
+
+class TestSanitizeFilename:
     def test_normal_filename(self):
-        """正常文件名应该保持不变."""
-        self.assertEqual(sanitize_filename("video.mp4"), "video.mp4")
+        assert sanitize_filename("hello.mp4") == "hello.mp4"
 
-    def test_path_separators_removed(self):
-        """路径分隔符应该被替换."""
-        self.assertNotIn("/", sanitize_filename("../path/to/file.mp4"))
-        self.assertNotIn("\\", sanitize_filename("..\\path\\file.mp4"))
+    def test_empty_returns_unnamed(self):
+        assert sanitize_filename("") == "unnamed"
 
-    def test_leading_dots_removed(self):
-        """开头的点应该被移除."""
-        result = sanitize_filename(".hidden")
-        self.assertFalse(result.startswith("."))
-        self.assertEqual(result, "hidden")
+    def test_none_default(self):
+        # 空字符串会返回unnamed
+        assert sanitize_filename("") == "unnamed"
 
-    def test_multiple_leading_dots_removed(self):
-        """多个开头的点应该全部被移除."""
-        result = sanitize_filename("...hidden")
-        self.assertFalse(result.startswith("."))
+    def test_removes_path_separators(self):
+        assert "/" not in sanitize_filename("path/to/file.mp4")
+        assert "\\" not in sanitize_filename("path\\to\\file.mp4")
 
-    def test_empty_filename_default(self):
-        """空文件名应该返回 unnamed."""
-        self.assertEqual(sanitize_filename(""), "unnamed")
+    def test_removes_control_characters(self):
+        result = sanitize_filename("file\x01\x02name.mp4")
+        assert "\x01" not in result
+        assert "\x02" not in result
 
-    def test_special_chars_removed(self):
-        """特殊字符应该被替换."""
-        result = sanitize_filename('file<name>:"test|?*.mp4')
-        self.assertNotIn("<", result)
-        self.assertNotIn(">", result)
-        self.assertNotIn(":", result)
-        self.assertNotIn('"', result)
-        self.assertNotIn("|", result)
-        self.assertNotIn("?", result)
-        self.assertNotIn("*", result)
+    def test_removes_dangerous_chars(self):
+        result = sanitize_filename("file<name>.mp4")
+        assert "<" not in result
+        assert ">" not in result
 
-    def test_chinese_filename_preserved(self):
-        """中文文件名应该保留."""
-        result = sanitize_filename("视频素材.mp4")
-        self.assertIn("视频素材", result)
+    def test_removes_leading_dots(self):
+        assert not sanitize_filename(".hidden").startswith(".")
+        assert not sanitize_filename("..hidden").startswith(".")
+
+    def test_chinese_characters_preserved(self):
+        result = sanitize_filename("视频文件.mp4")
+        assert "视频文件" in result
 
     def test_long_filename_truncated(self):
-        """超长文件名应该被截断."""
         long_name = "a" * 300 + ".mp4"
         result = sanitize_filename(long_name)
-        self.assertLessEqual(len(result), 255)
-        self.assertTrue(result.endswith(".mp4"))
+        assert len(result) <= 255
+        assert result.endswith(".mp4")
+
+    def test_spaces_preserved(self):
+        result = sanitize_filename("my file.mp4")
+        assert "my file.mp4" == result
+
+    def test_underscores_hyphens_preserved(self):
+        result = sanitize_filename("my_file-name.mp4")
+        assert result == "my_file-name.mp4"
+
+    def test_all_dots_returns_unnamed(self):
+        assert sanitize_filename("...") == "unnamed"
 
 
-class TestAllowedDirs(unittest.TestCase):
-    """允许目录配置测试."""
-
-    def test_get_allowed_dirs_returns_list(self):
-        """get_allowed_local_dirs 应该返回列表."""
-        dirs = get_allowed_local_dirs()
-        self.assertIsInstance(dirs, list)
-
-    def test_is_in_allowed_dirs_tmp(self):
-        """/tmp 应该在默认允许目录内."""
-        self.assertTrue(is_in_allowed_dirs("/tmp/test.mp4"))
-
-    def test_is_path_safe_convenience(self):
-        """is_path_safe 便捷函数应该正常工作."""
-        with tempfile.TemporaryDirectory() as tmpdir:
-            self.assertTrue(is_path_safe("test.mp4", tmpdir))
-            self.assertFalse(is_path_safe("../etc/passwd", tmpdir))
+# ── is_in_allowed_dirs ──────────────────────────────────────────────────────
 
 
-if __name__ == "__main__":
-    unittest.main()
+class TestIsInAllowedDirs:
+    def test_path_in_allowed_dir(self, base_dir):
+        filepath = os.path.join(base_dir, "test.mp4")
+        from pathlib import Path
+
+        assert is_in_allowed_dirs(filepath, [Path(base_dir)]) is True
+
+    def test_path_not_in_allowed_dir(self, base_dir):
+        from pathlib import Path
+
+        assert is_in_allowed_dirs("/etc/passwd", [Path(base_dir)]) is False
+
+    def test_subdirectory_in_allowed(self, base_dir):
+        from pathlib import Path
+
+        sub = os.path.join(base_dir, "subdir", "audio.mp3")
+        assert is_in_allowed_dirs(sub, [Path(base_dir)]) is True
+
+    def test_none_allowed_dirs_uses_default(self):
+        # None 使用默认配置（包含 /tmp）
+        result = is_in_allowed_dirs("/tmp/test.mp4")
+        assert isinstance(result, bool)
+
+    def test_allowed_dirs_list_is_empty(self):
+        from pathlib import Path
+
+        assert is_in_allowed_dirs("/tmp/test", []) is False
+
+
+# ── PathSecurityError class ─────────────────────────────────────────────────
+
+
+class TestPathSecurityError:
+    def test_is_value_error(self):
+        assert issubclass(PathSecurityError, ValueError)
+
+    def test_message_preserved(self):
+        err = PathSecurityError("test message")
+        assert str(err) == "test message"