Add more unit tests to `extendedConnection` to cover corner scenarios #21

Job	Run time
golangci-lint / golangci-lint	25s
checkgomod / checkgomod	15s
exclude-replace / excludereplace	2s
build-and-test / build-and-test (ubuntu-latest)	23s
yamllint / yamllint	14s
build-and-test / build-and-test (macos-latest)	28s
build-and-test / build-and-test (windows-latest)	2m 41s
	4m 28s

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