test: Fix correct cli option value casting

Since we can set the type of the relevant option in the OPTIONS dict, we
should also let the cli correctly cast them on parsing, just as the env
options do.

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,
+        }

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()