Fix py38 tests (#34658)

tests/components/ps4/conftest.py

@@ -0,0 +1,22 @@
+"""Test configuration for PS4."""
+from asynctest import patch
+import pytest
+
+
+@pytest.fixture
+def patch_load_json():
+    """Prevent load JSON being used."""
+    with patch("homeassistant.components.ps4.load_json", return_value={}) as mock_load:
+        yield mock_load
+
+
+@pytest.fixture
+def patch_save_json():
+    """Prevent save JSON being used."""
+    with patch("homeassistant.components.ps4.save_json") as mock_save:
+        yield mock_save
+
+
+@pytest.fixture(autouse=True)
+def patch_io(patch_load_json, patch_save_json):
+    """Prevent PS4 doing I/O."""