add clan_flake fixture to setup a temporary clan

pkgs/clan-cli/tests/clan_flake.py

@@ -0,0 +1,17 @@
+from pathlib import Path
+from typing import Iterator
+
+import pytest
+from environment import mock_env
+
+
+@pytest.fixture
+def clan_flake(
+    temporary_directory: Path, monkeypatch: pytest.MonkeyPatch
+) -> Iterator[Path]:
+    flake = temporary_directory / "clan-flake"
+    flake.mkdir()
+    (flake / ".clan-flake").touch()
+    monkeypatch.chdir(flake)
+    with mock_env(HOME=str(temporary_directory)):
+        yield temporary_directory

pkgs/clan-cli/tests/conftest.py

@@ -3,4 +3,4 @@ import sys
 
 sys.path.append(os.path.join(os.path.dirname(__file__), "helpers"))
 
-pytest_plugins = ["temporary_dir"]
+pytest_plugins = ["temporary_dir", "clan_flake"]