ducky/devices
ducky/devices/memstore_test.go
Add more interface tests. Add a test to ensure that, when retrieving Devices, no error is returned if a Device cannot be found. Add a test to ensure that, when adding Devices, adding a Device that shares an ID with a Device already in the Storer returns an ErrDeviceAlreadyExists error. This involved creating the ErrDeviceAlreadyExists error, and modifying the in-memory implementation to properly return it. Fix a go vet issue in our previous test, wherein we forgot to pass the storer to a log message, resulting in a mismatch between the number of variables expected and the number of variables provided. Rename our tests to be better reflective of what they actually test.