chore: add XDG path conversion test

tests/test_path_conversion.py

@@ -0,0 +1,13 @@
+from pathlib import Path
+from dzgui.config.xdg import get_xdg_paths
+
+
+def test_path_fallback(monkeypatch) -> None:
+    envs = ["XDG_DATA_HOME", "XDG_STATE_HOME", "XDG_CONFIG_HOME", "XDG_CACHE_HOME"]
+    for env in envs:
+        monkeypatch.setenv(env, "/etc/dzgui")
+    paths = get_xdg_paths()
+    assert paths["XDG_CONFIG_HOME"] == Path.home().joinpath(".config/dzgui")
+    assert paths["XDG_STATE_HOME"] == Path.home().joinpath(".local/state/dzgui")
+    assert paths["XDG_DATA_HOME"] == Path.home().joinpath(".local/share/dzgui")
+    assert paths["XDG_CACHE_HOME"] == Path.home().joinpath(".cache/dzgui")