Test failed when run go test in GitHub actions CI

Everything works fine on local enviroment, but can not run go test in GitHub actions CI.

My GitHub action config:

name: Build and test Go
on: [ push, pull_request ]
jobs:
 test:
 strategy:
 matrix:
 go-version: [ 1.15.x ]
 os: [ ubuntu-latest ]
 mongodb-version: [4.2]
 runs-on: ${{ matrix.os }}
 steps:
 - name: setup env
 shell: bash
 run: |
 echo "::set-env name=GOPATH::${{ github.workspace }}/go"
 echo "::add-path::${{ github.workspace }}/go/bin"

 - name: Install Go
 uses: actions/setup-go@v2
 with:
 go-version: ${{ matrix.go-version }}

 - name: Start MongoDB
 uses: supercharge/mongodb-github-action@1.3.0
 with:
 mongodb-version: ${{ matrix.mongodb-version }}

 - name: Checkout code
 uses: actions/checkout@v2

 - name: Build
 env:
 GOPROXY: "https://proxy.golang.org"
 run: go build .

 - name: Test
 run: go test ./...

Some GitHub action logs:

ok 	github.com/klauspost/compress/zstd	30.515s
ok 	github.com/klauspost/compress/zstd/internal/xxhash	0.016s
--- FAIL: TestFormatNew (0.00s)
 format_test.go:38: test 3: line 3: fmt.Sprintf("%+v", err):
 got: "error\ngithub.com/pkg/errors.TestFormatNew\n\t/home/runner/work/coinsmart-api/coinsmart-api/go/pkg/mod/github.com/pkg/errors@v0.9.1/format_test.go:26\ntesting.tRunner\n\t/opt/hostedtoolcache/go/1.15.0/x64/src/testing/testing.go:1108\nruntime.goexit\n\t/opt/hostedtoolcache/go/1.15.0/x64/src/runtime/asm_amd64.s:1374"
 want: "error\ngithub.com/pkg/errors.TestFormatNew\n\t.+/github.com/pkg/errors/format_test.go:26"
--- FAIL: TestFormatErrorf (0.00s)
 format_test.go:64: test 3: line 3: fmt.Sprintf("%+v", err):
 got: "error\ngithub.com/pkg/errors.TestFormatErrorf\n\t/home/runner/work/coinsmart-api/coinsmart-api/go/pkg/mod/github.com/pkg/errors@v0.9.1/format_test.go:56\ntesting.tRunner\n\t/opt/hostedtoolcache/go/1.15.0/x64/src/testing/testing.go:1108\nruntime.goexit\n\t/opt/hostedtoolcache/go/1.15.0/x64/src/runtime/asm_amd64.s:1374"
 want: "error\ngithub.com/pkg/errors.TestFormatErrorf\n\t.+/github.com/pkg/errors/format_test.go:56"

It seems errors can not pass the tests. But I don't know why.

[titouanfreville]

@zmrenwu are you using go mod vendor on your local environment ?
Your issue seems to be linked to the go mod installation witch add an @VERSION for each downloaded package while your test does not expect the versioning element. If you use a vendor directory on your local, the test will pass cause the vendored installation does not use the @Version packaging.