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aaronlehmann opened this issue Sep 12, 2016 · 4 comments
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cmd/go: test -i and -o options together don't work as expected #17078

aaronlehmann opened this issue Sep 12, 2016 · 4 comments
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Documentation Issues describing a change to documentation. FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
Milestone
Go1.8

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@aaronlehmann
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What version of Go are you using (go version)?

go version go1.7 darwin/amd64

What operating system and processor architecture are you using (go env)?

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/aaronl/go"
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -fno-common"
CXX="clang++"
CGO_ENABLED="1"

What did you do?

I tried to run go test with both the -i and -o flags. The help output implies this combination is supported:

           -i
               Install packages that are dependencies of the test.
               Do not run the test.

           -o file
               Compile the test binary to the named file.
               The test still runs (unless -c or -i is specified).

$ go test
PASS
ok      fmt     0.070s
$ go test -i -o testbinary
$ ./testbinary
-bash: ./testbinary: No such file or directory

What did you expect to see?

I expected go test -i -o testbinary to create a testbinary executable, and also install the package's dependencies.

What did you see instead?

No executable created.
@quentinmit quentinmit changed the title go test with -i and -o options doesn't work as expected test: -i and -o options together don't work as expected Sep 12, 2016
@quentinmit quentinmit added this to the Go1.8 milestone Sep 12, 2016
@0xmohit
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0xmohit commented Sep 13, 2016

This appears to be more of a documentation issue. You'd need to specify -c, i.e. go test -c -i -o testbinary:

        -c
                Compile the test binary to pkg.test but do not run it
                (where pkg is the last element of the package's import path).
                The file name can be changed with the -o flag.

Perhaps, -o should state that it renames the compiled binary to the named file instead of suggesting that it compiles.

@robpike
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robpike commented Sep 15, 2016

I agree this is a documentation issue. The code is working as expected.

@robpike robpike added the Documentation Issues describing a change to documentation. label Sep 15, 2016
@quentinmit quentinmit added the NeedsFix The path to resolution is known, but the work has not been done. label Oct 10, 2016
@rsc
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rsc commented Oct 18, 2016

I don't believe the code is working as expected. The docs spell out the behavior of -o quite clearly, and the code doesn't do what the docs say. It is trivial to make 'go test -i -o x.test' work as documented, and harder to document the current behavior clearly. I'll send a CL for the code.

@rsc rsc changed the title test: -i and -o options together don't work as expected cmd/go: test -i and -o options together don't work as expected Oct 18, 2016
@gopherbot
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CL https://golang.org/cl/31352 mentions this issue.

@golang golang locked and limited conversation to collaborators Oct 19, 2017
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Documentation Issues describing a change to documentation. FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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@rsc @quentinmit @robpike @0xmohit @gopherbot @aaronlehmann