Speedwagon-497 Save System information to File exits with an unhandle…

…d exception

speedwagon/utils.py

@@ -49,6 +49,10 @@ def emit(self, record: logging.LogRecord) -> None:
 
 
 def get_desktop_path() -> str:
+    """Locate user's desktop.
+
+    Throws FileNotFoundError if unsuccessful
+    """
     home = pathlib.Path.home()
     desktop_path = home / "Desktop"
     if os.path.exists(desktop_path):

tests/test_utils.py

@@ -0,0 +1,31 @@
+import os
+
+import pytest
+
+from speedwagon import utils
+import pathlib
+
+
+def test_get_desktop_path_finds_valid(monkeypatch):
+    fake_home = os.path.join("usr", "home")
+    monkeypatch.setattr(
+        pathlib.Path, "home", lambda: pathlib.Path(fake_home)
+    )
+
+    def exists(path):
+        return str(path) == os.path.join(fake_home, "Desktop")
+
+    monkeypatch.setattr(os.path, "exists", exists)
+    assert utils.get_desktop_path()
+
+
+def test_get_desktop_path_not_found_throws(monkeypatch):
+    fake_home = os.path.join("usr", "home")
+
+    monkeypatch.setattr(
+        pathlib.Path, "home", lambda: pathlib.Path(fake_home)
+    )
+
+    monkeypatch.setattr(os.path, "exists", lambda _: False)
+    with pytest.raises(FileNotFoundError):
+        utils.get_desktop_path()