diff --git a/backend/app/main.py b/backend/app/main.py
index acc8b27..777894f 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -2,7 +2,7 @@ from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
 from app.config import settings
-from app.routers import documents
+from app.routers import documents, search
 
 app = FastAPI(title="DocHub API")
 
@@ -15,6 +15,12 @@ app.add_middleware(
 )
 
 app.include_router(documents.router)
+app.include_router(search.router)
+
+
+@app.get("/health")
+def health():
+    return {"status": "ok"}
 
 
 @app.get("/health")
diff --git a/backend/tests/test_main.py b/backend/tests/test_main.py
index 7cede08..6371b7b 100644
--- a/backend/tests/test_main.py
+++ b/backend/tests/test_main.py
@@ -1,6 +1,9 @@
+import pytest
 from fastapi.testclient import TestClient
 
 from app.main import app
+from app.document_service import DocumentNotFoundError
+from app.dependencies import get_document_service, get_search_client
 
 client = TestClient(app)
 
@@ -9,3 +12,85 @@ def test_health_returns_ok():
     response = client.get("/health")
     assert response.status_code == 200
     assert response.json() == {"status": "ok"}
+
+
+class FakeDocumentService:
+    def __init__(self):
+        self.storage = {}
+
+    def list_documents(self, path):
+        prefix = path if not path or path.endswith("/") else f"{path}/"
+        files = [
+            {"key": key, "name": key[len(prefix):], "size": len(data), "modifiedAt": "2026-08-01T10:00:00Z"}
+            for key, data in self.storage.items()
+            if key.startswith(prefix)
+        ]
+        return {"folders": [], "files": files}
+
+    def get_document(self, key):
+        if key not in self.storage:
+            raise DocumentNotFoundError(key)
+        return {"key": key, "content": self.storage[key].decode("utf-8"), "contentType": "text/markdown"}
+
+    def save_document(self, key, content, content_type):
+        self.storage[key] = content
+        return {"key": key, "updatedAt": "2026-08-01T10:05:00Z"}
+
+    def delete_document(self, key):
+        self.storage.pop(key, None)
+
+    def upload_document(self, key, data, content_type):
+        self.storage[key] = data
+        return {"key": key, "name": key.rsplit("/", 1)[-1], "size": len(data)}
+
+
+class FakeSearchClient:
+    def search(self, query):
+        return [
+            {
+                "key": "产品文档/架构设计.md",
+                "title": "架构设计.md",
+                "path": "产品文档",
+                "snippet": "全文<em>检索</em>示例",
+            }
+        ]
+
+
+@pytest.fixture
+def e2e_client():
+    fake_service = FakeDocumentService()
+    fake_search = FakeSearchClient()
+    app.dependency_overrides[get_document_service] = lambda: fake_service
+    app.dependency_overrides[get_search_client] = lambda: fake_search
+    with TestClient(app) as test_client:
+        yield test_client
+    app.dependency_overrides.clear()
+
+
+def test_end_to_end_upload_get_list_search_delete_flow(e2e_client):
+    upload_response = e2e_client.post(
+        "/api/upload",
+        data={"path": "产品文档"},
+        files={"file": ("架构设计.md", "# 架构设计\n\nDocHub 支持全文检索。".encode("utf-8"), "text/markdown")},
+    )
+    assert upload_response.status_code == 201
+    key = upload_response.json()["key"]
+    assert key == "产品文档/架构设计.md"
+
+    get_response = e2e_client.get(f"/api/documents/{key}")
+    assert get_response.status_code == 200
+    assert "架构设计" in get_response.json()["content"]
+
+    list_response = e2e_client.get("/api/documents", params={"path": "产品文档"})
+    assert list_response.status_code == 200
+    assert any(f["key"] == key for f in list_response.json()["files"])
+
+    search_response = e2e_client.get("/api/search", params={"q": "检索"})
+    assert search_response.status_code == 200
+    assert search_response.json()["results"][0]["key"] == "产品文档/架构设计.md"
+
+    delete_response = e2e_client.delete(f"/api/documents/{key}")
+    assert delete_response.status_code == 204
+
+    missing_response = e2e_client.get(f"/api/documents/{key}")
+    assert missing_response.status_code == 404