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The onError callback can use the same future as the onResult callback by calling completeExceptionally. This change is also removing the test for a specific exception message. Testing for a specific exception message would mean that tests break if we ever were to update them. If we decide that there is value to distinguish between different types of EthernetNetworkManagementException we should probably subclass it internally. Test: atest EthernetNetworkFactoryTest Change-Id: Ib6f8cf79fc26e0f856c880cbe505b101f12aa187