feat: creating mogodb and postgres mock instance in checkpoint test (#561)

* fix: using mongomock for the checkpoint test

* Add postgres mock setting to the unit test

* Added utils file of postgres_mock_utils

* fixed the runtime loading error of deerflow server

pyproject.toml

@@ -37,6 +37,7 @@ dependencies = [
     "langchain-tavily<0.3",
     "langgraph-checkpoint-mongodb>=0.1.4",
     "langgraph-checkpoint-postgres==2.0.21",
+    "psycopg[binary]>=3.2.9",
 ]
 
 [project.optional-dependencies]
@@ -48,6 +49,10 @@ test = [
     "pytest>=7.4.0",
     "pytest-cov>=4.1.0",
     "pytest-asyncio>=1.0.0",
+    "pytest-cov>=6.0.0",
+    "asyncpg-stubs>=0.30.2",
+    "mongomock>=4.3.0",
+    "pytest-postgresql>=7.0.2",
 ]
 
 [tool.uv]
@@ -78,3 +83,4 @@ extend-include = ["*.pyi"]
 indent-style = "space"
 line-ending = "auto"
 exclude = ['^/build/']
+