What version of Go are you using?

$ go version
go version go1.10 linux/amd64

Does this issue reproduce with the latest release?

I guess this is the latest release.

What operating system and processor architecture are you using?

$ go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/steven/.cache/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/steven/gocode"
GORACE=""
GOROOT="/usr/lib/go"
GOTMPDIR=""
GOTOOLDIR="/usr/lib/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build002363276=/tmp/go-build -gno-record-gcc-switches"

What did you do?

Using the ginkgo cli tool, I created a test suite bootstrap. The folder name is testsuite, so the tool defaulted to a package name testsuite_test.

I changed the package name in all files to cbsproxy_test, the package I'm testing, which is itself located in a different subdirectory on the same level as testsuite.

I ran both go build and go test.

What did you expect to see?

go build to succeed normally and go test to produce test results for 0 tests.

What did you see instead?

(newlines mine)

can't load package: package github.com/san-lab/cbsproxy-go/testsuite: 
found packages cbsproxy (cbsproxy_suite_test.go) and cbsproxy_test (common.go) 
in /home/steven/gocode/src/github.com/san-lab/cbsproxy-go/testsuite

Just to proof that all packages are named cbsproxy_test:

$ head -n 1 ./*.go
==> ./balance_test.go <==
package cbsproxy_test

==> ./cbsproxy_suite_test.go <==
package cbsproxy_test

==> ./common.go <==
package cbsproxy_test

What solved the issue?

Renaming common.go to common_test.go resolved the issue. The error message was however not clear. As should it be possible to have both normal Go files and _test Go files with the same package name (as with any normal package that does not end in _test).