diff --git a/test/test_configuration.py b/test/test_configuration.py
new file mode 100644
index 0000000..b40223f
--- /dev/null
+++ b/test/test_configuration.py
@@ -0,0 +1,32 @@
+from pathlib import Path
+
+import pytest
+
+from topen import OPTIONS, parse_cli, parse_env, parse_rc
+
+
+class TestCli:
+    def test_cli_minimum_id(self, monkeypatch):
+        monkeypatch.setattr("sys.argv", ["topen", "42"])
+        assert parse_cli() == {"task_id": "42"}
+
+    def test_cli_options(self, monkeypatch):
+        monkeypatch.setattr(
+            "sys.argv",
+            [
+                "topen",
+                "123",
+                "--extension",
+                "txt",
+                "--editor",
+                "vim",
+                "--quiet",
+                "True",
+            ],
+        )
+        assert parse_cli() == {
+            "task_id": "123",
+            "notes_ext": "txt",
+            "notes_editor": "vim",
+            "notes_quiet": True,
+        }
diff --git a/topen.py b/topen.py
index b829745..90f99e6 100755
--- a/topen.py
+++ b/topen.py
@@ -295,6 +295,7 @@ you view the task.
             dest=key,
             metavar=opt.metavar,
             help=opt.help_text,
+            type=opt.cast or str,
             default=None,
         )
     args = parser.parse_args()