Assertions/Tests using ArrayWith

[automartin5000]

Following this Stack Overflow answer, I'm trying to write a test to check if a container is in a Task Definition. I'd also like to test that the expected number of containers is in a container definition. I can't get the aforementioned Stack Overflow answer to work using something like:

    test('Container1 Added to FargateTaskDefinition', () => {

        template.hasResourceProperties('AWS::ECS::TaskDefinition', Match.objectLike({
            Family: "Fargate-Task",
            ContainerDefinitions: Match.arrayWith(
                [
                    Match.objectLike(expectedContainer1Definition(envName, prodSecurity)),
                ]
            ),
        }));
    });

My tests are returning:
Missing element at pattern index 0 at /Properties/ContainerDefinitions (using arrayWith matcher)