Basically there are unit tests for the layer above (GoogleComputeEngineServiceExpectTest), and the layer below (FirewallApiExpectTest), but nothing specific for the SecurityGroupExtension. The FirewallApi already has the ability to specify a single port (and already has tests for that) and this fix just opened up the logic to utilize that from the the SecurityGroupExtension, so I'm thinking that the live tests are sufficient here IMHO.
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