connect: Add 1x1 cases
connect: Add 1x1 cases

They were momentarily removed by #335 since [exercism/x-common#297][1]
did not have them, but [exercism/x-common#306][2] did. We'll add them
back since they do test valuable cases.

[1]: https://github.com/exercism/x-common/pull/297
[2]: https://github.com/exercism/x-common/pull/306

leenipper/xgo,exercism/xgo,robphoenix/exercism-go,exercism/xgo,leenipper/xgo,robphoenix/exercism-go