"Cannot find package" error when running "goapp tool cover"

[Ingo Jaeckel]

Hi,

I am trying to convert my code coverage results into HTML by running the following.

$ goapp test -cover -test.v=true -test.coverprofile=c.out
$ goapp tool cover -html=c.out

I am using the Go GAE SDK (extracted to /Users/ingo/Downloads/go_appengine). I am running this from the root directory of my GAE app which is located in /Users/ingo/git/loyalty. This folder contains all my *.go files. All files belong to a package called "app".

The coverage information is collected just fine. But trying to convert them into HTML fails with this error:

goapp tool cover -html=c.out
cover: can't find "app.go": cannot find package "_/Users/ingo/git/loyalty/" in any of:
/Users/ingo/Downloads/go_appengine/goroot/src/pkg/_/Users/ingo/git/loyalty (from $GOROOT)
/Users/ingo/Downloads/go_appengine/gopath/src/_/Users/ingo/git/loyalty (from $GOPATH)

What does this mean and how can I fix it?

Thanks,

Ingo

[Ingo Jaeckel]

Is the structure of my app preventing me from running this correctly? Can I not use the "app" package that I am currently using? Or do I have to adjust my directory structure?

Is there another way to visualize the coverage results stored in the c.out file? I am not sure if the format is Go specific or if this can be parsed by existing tools.

Thanks,

Ingo

[Tamás Gulácsi]

Just a shot into the dark: try "go" instead of "goapp".

[Ingo Jaeckel]

After asking this question I was under the impression I can do this with the Go GAE SDK. Are you implying that I the coverage results can only be converted to HTML with go instead of Go's GAE SDK? If that's true, are there other things that work with go but not with goapp?

Thanks,

Ingo

$ goapp

Go is a tool for managing Go source code.

Usage:

goapp command [arguments]

The commands are:

    serve       starts a local development App Engine server

    deploy      deploys your application to App Engine

    build       compile packages and dependencies

    clean       remove object files

    env         print Go environment information

    fix         run go tool fix on packages

    fmt         run gofmt on package sources

    get         download and install packages and dependencies

    install     compile and install packages and dependencies

    list        list packages

    run         compile and run Go program

    test        test packages

    tool        run specified go tool

    version     print Go version

    vet         run go tool vet on packages

[Ingo Jaeckel]

Is it possible to collect code coverage information on Go GAE apps?

Thanks,

Ingo

[Andreas Hulstkamp]

Hi Ingo

Had trouble figuring this out too. 

It's a 2-step process.

1. Generate coverfile, SLT: 
   goapp test -coverprofile c.out
   
   
2. Use the go tool to launch a HTML representation of c.out: SLT: 
   
   go tool cover -html c.out
   
   

hth

Andy

[Andreas Hulstkamp]

Also, seems that the paths in your coverfile are invalid. Make them relative to the working directory and see if this helps.

[David Cruz]

Any luck with this yet? I'm facing the same problem... thanks!

[Ingo Jaeckel]

Hey David,

I posted an update about this on stackoverflow. There is an open issue related to it. As a temporary workaround I am doing the following 

goapp test -cover -test.v=true -test.coverprofile=c.out

sed -i -e "s#.*/\(.*\.go\)#\./\\1#" c.out
goapp tool cover -html c.out -o coverage.html

Hope that helps.

Thanks,

Ingo

On Thu, May 14, 2015 at 12:23 AM, David Cruz <davi...@gmail.com> wrote:

Any luck with this yet? I'm facing the same problem... thanks!

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[David Cruz]

That is perfect! Thanks a lot Ingo... you rock!