Fix error

.github/workflows/python-tests.yml

@@ -32,7 +32,7 @@ jobs:
     strategy:
       matrix:
         python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
-        optuna-version: ['optuna==3.1.0', 'optuna>=3.1.0']
+        optuna-version: ['optuna>=3.1.0']
     steps:
       - uses: actions/checkout@v2
       - name: Setup Python${{ matrix.python-version }}
@@ -51,13 +51,8 @@ jobs:
           pip install --progress-bar off .
       - name: Run python unit tests
         run: |
-          if [ "${{ matrix.optuna-version }}" = "optuna==3.1.0" ]; then
-            ignore_option="--ignore python_tests/artifact/"
-          else
-            ignore_option=""
-          fi
-          pytest python_tests $ignore_option
-  test-with-optuna-master:
+          pytest python_tests
+  test (3.11, optuna==main):
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
@@ -73,4 +68,26 @@ jobs:
           pip install --progress-bar off .[test]
           pip install --progress-bar off .
           python -m pip install --progress-bar off --upgrade git+https://github.com/optuna/optuna.git
-      - run: pytest python_tests
+      - name: Run python unit tests
+        run: |
+          pytest python_tests
+  test (3.11, optuna==3.1.0):
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.11'
+          architecture: x64
+      - name: Install dependencies
+        run: |
+          python -m pip install --progress-bar off --upgrade pip setuptools
+          pip install --progress-bar off .[optional]
+          pip install --progress-bar off .[test]
+          pip install --progress-bar off .
+          python -m pip install --progress-bar off --upgrade optuna==3.1.0
+      - name: Run python unit tests
+        run: |
+          ignore_option="--ignore python_tests/artifact/ python_tests/test_csv_download.py"
+          pytest python_tests $ignore_option