xgo mock os.MkdirAll failed

[saitofun]

go env

GO111MODULE='on'
GOARCH='arm64'
GOBIN='/Users/sincos/sincos/bin'
GOCACHE='/Users/sincos/sincos/tmp/go-cache'
GOENV='/Users/sincos/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='arm64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMODCACHE='/Users/sincos/sincos/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='darwin'
GOPATH='/Users/sincos/sincos'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/opt/homebrew/Cellar/go/1.22.0/libexec'
GOSUMDB='sum.golang.org'
GOTMPDIR='/Users/sincos/sincos/tmp/go-tmp'
GOTOOLCHAIN='auto'
GOTOOLDIR='/opt/homebrew/Cellar/go/1.22.0/libexec/pkg/tool/darwin_arm64'
GOVCS=''
GOVERSION='go1.22.0'
GCCGO='gccgo'
AR='ar'
CC='cc'
CXX='c++'
CGO_ENABLED='1'
GOMOD='/Users/sincos/sincos/src/github.com/sincospro/snippets/xgo/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/Users/sincos/sincos/tmp/go-tmp/go-build1010920956=/tmp/go-build -gno-record-gcc-switches -fno-common'

test code:

func MyFunc(output string) error {
        if err := os.MkdirAll(output, os.ModePerm); err != nil {
                return err
        }
        // other code
        return nil
}

func TestMyFunc(t *testing.T) {
        t.Run("FailedToMkDir", func(t *testing.T) {
                mock.Patch(os.MkdirAll, func(string, os.FileMode) error {
                        return nil
                })
        })
}

test command:

xgo test ./... -v

test output:

=== RUN   TestMyFunc
=== RUN   TestMyFunc/FailedToMkDir
--- FAIL: TestMyFunc (0.00s)
    --- FAIL: TestMyFunc/FailedToMkDir (0.00s)
panic: failed to setup mock for: os.MkdirAll [recovered]
        panic: failed to setup mock for: os.MkdirAll

goroutine 4 [running]:
testing.tRunner.func1.2({0x100da6380, 0x140003b5560})
        /Users/sincos/.xgo/go-instrument/go1.22.0_op_ho_Ce_go_1._li_26ff9148/go1.22.0/src/testing/testing.go:1642 +0x1c4
testing.tRunner.func1()
        /Users/sincos/.xgo/go-instrument/go1.22.0_op_ho_Ce_go_1._li_26ff9148/go1.22.0/src/testing/testing.go:1645 +0x334
panic({0x100da6380?, 0x140003b5560?})
        /Users/sincos/.xgo/go-instrument/go1.22.0_op_ho_Ce_go_1._li_26ff9148/go1.22.0/src/runtime/panic.go:770 +0x124
github.com/xhd2015/xgo/runtime/mock.getFunc({0x100d9a660, 0x100e426d8})
        /Users/sincos/sincos/pkg/mod/github.com/xhd2015/xgo/[email protected]/mock/mock.go:54 +0xd4
github.com/xhd2015/xgo/runtime/mock.Patch({0x100d9a660, 0x100e426d8}, {0x100d9a660, 0x100e426d0})
        /Users/sincos/sincos/pkg/mod/github.com/xhd2015/xgo/[email protected]/mock/patch.go:51 +0x1fc
github.com/sincospro/learn/xgo.TestMyFunc.func1(0x14000344b60)
        /Users/sincos/sincos/src/github.com/sincospro/snippets/xgo/xgo_test.go:19 +0x118
testing.tRunner(0x14000344b60, 0x100e426c8)
        /Users/sincos/.xgo/go-instrument/go1.22.0_op_ho_Ce_go_1._li_26ff9148/go1.22.0/src/testing/testing.go:1709 +0x23c
created by testing.(*T).Run in goroutine 3
        /Users/sincos/.xgo/go-instrument/go1.22.0_op_ho_Ce_go_1._li_26ff9148/go1.22.0/src/testing/testing.go:1762 +0x2f4
FAIL    github.com/sincospro/learn/xgo  0.438s
FAIL
exit status 1

[xhd2015]

In current version of xgo, you need to add --trap-stdlib to mock stdlib functions.

See #144.

We are planning to make it default in the future versions.

[xhd2015]

os.MkdirAll has been tested to work with --trap-stdlib, see

xgo/runtime/test/trap_stdlib_any/trap_stdlib_any_test.go

Line 52 in 310d0d4

name: "os.MkdirAll",

.

[xhd2015]

@saitofun --trap-stdlib has been made default when running xgo test, released with https://github.com/xhd2015/xgo/releases/tag/v1.0.38.

To install xgo v1.0.38:

# update xgo
go install github.com/xhd2015/xgo/cmd/[email protected]

# update dependency
go get github.com/xhd2015/xgo/[email protected]

Thanks.