https://fluidproject.atlassian.net/browse/FLUID-5496#icft=FLUID-5496 is incompletely implemented - this fixture doesn't accept a single object as the value of "args" which is supported everywhere else in the framework - for example, the following fixture is invalid:

{
event: "{decisionRequest}.events.onComplete",
listener: "gpii.test.cloudBased.oauth2.verifyDecisionResponse",
args: "{decisionRequest}"
}

and the args must be provided within an array.