diff --git a/.github/actions/setup-python/action.yml b/.github/actions/setup-python/action.yml
index 42485fb7..d164ca79 100644
--- a/.github/actions/setup-python/action.yml
+++ b/.github/actions/setup-python/action.yml
@@ -10,17 +10,22 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - uses: actions/setup-python@v2
+    - id: python
+      uses: actions/setup-python@v2
       with:
         python-version: ${{ inputs.python-version }}
         architecture: "x64"
 
     - uses: Gr1N/setup-poetry@v7
 
+    - id: poetry-cache
+      run: echo "::set-output name=dir::$(poetry config virtualenvs.path)"
+      shell: bash
+
     - uses: actions/cache@v2
       with:
-        path: ~/.cache/pypoetry/virtualenvs
-        key: ${{ runner.os }}-poetry-${{ inputs.python-version }}-${{ hashFiles('**/poetry.lock') }}
+        path: ${{ steps.poetry-cache.outputs.dir }}
+        key: ${{ runner.os }}-poetry-${{ steps.python.outputs.python-version }}-${{ hashFiles('**/poetry.lock') }}
 
     - run: poetry install -E all
       shell: bash
diff --git a/tests/test_plugin/test_load.py b/tests/test_plugin/test_load.py
index 209ee8e0..080d053c 100644
--- a/tests/test_plugin/test_load.py
+++ b/tests/test_plugin/test_load.py
@@ -22,7 +22,10 @@ async def test_load_plugin(app: App, load_plugin: Set["Plugin"]):
     assert "plugins.export" in sys.modules
 
     # check sub plugin
+    plugin = nonebot.get_plugin("nested_subplugin")
+    assert plugin
     assert "plugins.nested.plugins.nested_subplugin" in sys.modules
+    assert plugin.parent_plugin == nonebot.get_plugin("nested")
 
     # check load again
     with pytest.raises(RuntimeError):