tests: Make sure ExpectedConsole is checked

tests/test_cli.py

@@ -29,9 +29,11 @@ class ExpectedConsole:
     def __init__(self) -> None:
         self._file = io.StringIO()
         self._console = rich.console.Console(file=self._file)
+        self.checked = False
         self.exit_code: int | None = None
 
     def check(self, result: click.testing.Result) -> None:
+        self.checked = True
         assert result.exit_code == self.exit_code
         assert result.output == self._file.getvalue()
 
@@ -65,7 +67,9 @@ class Runner:
 
 @pytest.fixture
 def expected() -> ExpectedConsole:
-    return ExpectedConsole()
+    console = ExpectedConsole()
+    yield console
+    assert console.checked
 
 
 @pytest.fixture