Fix issue when decorator does not have any arguments

Signed-off-by: Ivan Santiago Paunovic <[email protected]>

Author: ivanpauno

launch_testing/launch_testing/pytest/fixture.py

@@ -65,7 +65,7 @@ def event_loop():
     return event_loop
 
 
-def fixture(*args, **kwargs):
+def fixture(decorated = None, *args, **kwargs):
     """
     Decorate launch_test fixtures.
 
@@ -98,4 +98,6 @@ def fixture(*args, **kwargs):
     def decorator(fixture_function):
         fixture_function._launch_pytest_fixture = True
         return pytest.fixture(fixture_function, *args, **kwargs)
-    return decorator
+    if decorated is None:
+        return decorator
+    return decorator(decorated)

launch_testing/test/launch_testing/new_hooks/test_function_scope.py

@@ -23,7 +23,7 @@ def order():
     return []
 
 
-@launch_testing.pytest.fixture()
+@launch_testing.pytest.fixture
 def launch_description():
     return launch.LaunchDescription([
         launch_testing.util.KeepAliveProc(),