/usr/share/gocode/src/golang.org/x/crypto/ssh/test/ is in golang-golang-x-crypto-dev 1:0.0~git20170629.0.5ef0053-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gocode/src/golang.org/x/crypto/ssh/test/agent_unix_test.go
/usr/share/gocode/src/golang.org/x/crypto/ssh/test/cert_test.go
/usr/share/gocode/src/golang.org/x/crypto/ssh/test/dial_unix_test.go
/usr/share/gocode/src/golang.org/x/crypto/ssh/test/doc.go
/usr/share/gocode/src/golang.org/x/crypto/ssh/test/forward_unix_test.go
/usr/share/gocode/src/golang.org/x/crypto/ssh/test/session_test.go
/usr/share/gocode/src/golang.org/x/crypto/ssh/test/test_unix_test.go
/usr/share/gocode/src/golang.org/x/crypto/ssh/test/testdata_test.go
/usr/share/gocode/src/golang.org/x/crypto/ssh/testdata/doc.go
/usr/share/gocode/src/golang.org/x/crypto/ssh/testdata/keys.go