avoid colliding git clones

tests/helpers.py

@@ -5,6 +5,7 @@
 import re
 import shutil
 import sys
+import tempfile
 import urllib.parse
 
 from pathlib import Path
@@ -14,7 +15,6 @@
 from poetry.core.packages.utils.link import Link
 from poetry.core.vcs.git import ParsedUrl
 
-from poetry.config.config import Config
 from poetry.console.application import Application
 from poetry.factory import Factory
 from poetry.installation.executor import Executor
@@ -117,7 +117,8 @@ def mock_clone(
     folder = FIXTURE_PATH / "git" / parsed.resource / path
 
     if not source_root:
-        source_root = Path(Config.create().get("cache-dir")) / "src"
+        temp_dir = tempfile.mkdtemp()
+        source_root = Path(temp_dir) / "src"
 
     dest = source_root / path
     dest.parent.mkdir(parents=True, exist_ok=True)