Currently, there's no way to skip tests that require storage. This will cause go test to fail every time. There should be a default behaviour that skips the storage tests and one that includes them.
One option would be with testing.Short, another is to pass ginkgo arg like --storage=true and skip/mark as pending.

https://docs.spring.io/spring-cloud-app-broker/docs/1.1.1.RELEASE/reference/#service-instance-parameters

The documentation for parameter-transformers show args as an array element

  parameters-transformers:
                - name: EnvironmentMapping
                  args:
                    - include: parameter1,parameter2
                - name: PropertyMapping