查找主模块失败：请查看"前往帮助模块"

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我最近开始使用 go。我在 vscode 上安装了 go 的扩展，我可以使用一些命令，例如 go run 和 go build 但当我运行 go test 时出现以下错误：

go：找不到主模块；请参阅“转到帮助模块”

虽然我有一个 *_test.go 文件。

当我运行 go help 模块时，我得到以下输出：

Modules are how Go manages dependencies.

A module is a collection of packages that are released, versioned, and
distributed together. Modules may be downloaded directly from version control
repositories or from module proxy servers.

For a series of tutorials on modules, see
https://golang.org/doc/tutorial/create-module.

For a detailed reference on modules, see https://golang.org/ref/mod.

By default, the go command may download modules from https://proxy.golang.org.
It may authenticate modules using the checksum database at
https://sum.golang.org. Both services are operated by the Go team at Google.
The privacy policies for these services are available at
https://proxy.golang.org/privacy and https://sum.golang.org/privacy,
respectively.

The go command's download behavior may be configured using GOPROXY, GOSUMDB,
GOPRIVATE, and other environment variables. See 'go help environment'
and https://golang.org/ref/mod#private-module-privacy for more information.

解决方案

您必须先初始化项目，然后才能运行测试：

go mod init puppy

https://golang.org/cmd/go#hdr-Module_maintenance

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