Newbie question #2: cannot get gotest to work

[Martin Ellison]

I cannot get gotest to work. Issues:

1. when I try go test main I get: /tmp/go-build550118144/main/_test/_testmain.go:9: cannot import "main" and FAIL    main [build failed]
2. when I do run some tests, I get a report that the tests have failed, but no t.Errorf messages.

Any idea what I should be doing?

[Jan Mercl]

On Tue, May 5, 2015 at 3:51 PM Martin Ellison <martin....@gmail.com> wrote:

> I cannot get gotest to work. Issues:
>
> when I try go test main

Try dropping the 'main', unless it's really the intended import path of the package you want to run tests on.

-j

[Martin Ellison]

On Tuesday, 5 May 2015 22:16:11 UTC+8, Jan Mercl wrote:

Try dropping the 'main', unless it's really the intended import path of the package you want to run tests on.

 
~/go/src/jennyemily2/src/main> go test
# testmain
/tmp/go-build458325106/main/_test/_testmain.go:9: cannot import "main"
FAIL    main [build failed]

[Volker Dobler]

You will have to provide more details like output of `go env`

files in ~/go/src/jennyemily2/src/main and at least their

package clause and imports. What does go build -v do?

V.

[Martin Ellison]

You will have to provide more details like output of `go env`

files in ~/go/src/jennyemily2/src/main and at least their

package clause and imports. What does go build -v do?

I have constructed a test project to focus on these issues.

~/go/src/golang-test> find src
src
src/main
src/main/main.go
src/main/main_test.go

main.go

// main is a test of golang.
package main

import "fmt"

// Test is a visible func
func Test() int {
    println("running Test")
    return 17
}
func main() {
    x := Test()
    fmt.Printf("test is %d\n", x)
}

main_test.go

package main

import "testing"

func TestMain(t *testing.T) {
    x := Test()
    if x != 0 {t.Errorf("bad test expected 0 got %d", x)}
}

~/go/src/golang-test> go env
GOARCH="amd64"
GOBIN=""
GOCHAR="6"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/work/golang:/home/martin/go/src/golang-test"
GORACE=""
GOROOT="/usr/lib/golang"
GOTOOLDIR="/usr/lib/golang/pkg/tool/linux_amd64"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0"
CXX="g++"
CGO_ENABLED="1"
You have new mail in /var/spool/mail/martin
~/go/src/golang-test> go build -v main
main
~/go/src/golang-test> go test main
# testmain
/tmp/go-build149703873/main/_test/_testmain.go:9: cannot import "main"
FAIL    main [build failed]
~/go/src/golang-test> godoc main
COMMAND DOCUMENTATION

    main is a test of golang.

~/go/src/golang-test> ./main
running Test
test is 17

[Jan Mercl]

On Wed, May 6, 2015 at 3:57 PM Martin Ellison <martin....@gmail.com> wrote:

The directory name "main" is magic or there's a bug in the Go build tool.

(16:42) jnml@r550:~$ cd $GOPATH/src/main

(16:42) jnml@r550:~/src/main$ go test

# testmain

/tmp/go-build582720844/main/_test/_testmain.go:12: cannot import "main"

FAIL main [build failed]

(16:42) jnml@r550:~/src/main$ cd ..

(16:42) jnml@r550:~/src$ mv main/ foo

(16:42) jnml@r550:~/src$ cd foo/

/home/jnml/src/foo

(16:42) jnml@r550:~/src/foo$ go test

running Test

--- FAIL: TestMain (0.00s)

main_test.go:8: bad test expected 0 got 17

FAIL

exit status 1

FAIL foo 0.002s

(16:42) jnml@r550:~/src/foo$

-j

[Martin Ellison]

Indeed, I changed the 'main' directory to 'golangtest' and did the same for the package statements in both .go files, and everything worked.

I had somehow got the impression that the main program had to be in package main; I am not sure why.

The golang documentation should be updated to say that one cannot use 'main' as a package name, and there should be an error message if one does.

Jan, thanks for your help.

Regards,
Martin

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[minux]

On Wed, May 6, 2015 at 10:58 PM, Martin Ellison <m...@acm.org> wrote:

Indeed, I changed the 'main' directory to 'golangtest' and did the same for the package statements in both .go files, and everything worked.

I had somehow got the impression that the main program had to be in package main; I am not sure why.

The golang documentation should be updated to say that one cannot use 'main' as a package name, and there should be an error message if one does.

It does seem like a bug of the go tool, although a minor one.

If you rename the directory to something other than main, go test should work,

even if the package name is still "main".

[minux]

On Thu, May 7, 2015 at 1:54 AM, minux <mi...@golang.org> wrote:

On Wed, May 6, 2015 at 10:58 PM, Martin Ellison <m...@acm.org> wrote:

Indeed, I changed the 'main' directory to 'golangtest' and did the same for the package statements in both .go files, and everything worked.

I had somehow got the impression that the main program had to be in package main; I am not sure why.

The golang documentation should be updated to say that one cannot use 'main' as a package name, and there should be an error message if one does.

It does seem like a bug of the go tool, although a minor one.

After more thought, I don't think it's a bug. You just can't test a package whose

import path is "main". Because the test driver is the package main, so it can't

import another package whose import path is also "main".