使用 go build 但我也看到了 -test 标志

Question

我有一个 main.go 和 mypkg/...go。我使用 go build -o main main.go 或 go install <pkg that has main.go> 并且其中有一些我需要的标志。但我也看到了测试标志。为什么会这样？我错过了什么？

Usage of ./main:
  -docker string
        Docker API Path, defaults to local (default "unix:///var/run/docker.sock")
  -httptest.serve string
        if non-empty, httptest.NewServer serves on this address and blocks
  -port int
        The default port to listen (default 8000)
  -test.bench string
        regular expression per path component to select benchmarks to run
  -test.benchmem
        print memory allocations for benchmarks
  -test.benchtime duration
        approximate run time for each benchmark (default 1s)
  -test.blockprofile string
        write a goroutine blocking profile to the named file after execution
  -test.blockprofilerate int
        if >= 0, calls runtime.SetBlockProfileRate() (default 1)

dockerPath 和 port 是我的标志，但正如你所见，其他不是我的标志。

Answer 1

很可能您使用的是默认标志集（flag.FlagSet) of the flag 包。请注意，您可能不是唯一使用它的人。如果您导入其他包，它们也可能会注册标志，这将就像您自己的标志（您注册的标志）一样被处理。

看这个简单的例子：

import (
    "flag"
    _ "testing"
)

func main() {
    flag.Int("port", 80, "port to use")
    flag.Parse()
}

此应用注册了一个 port 标志，仅此而已。但它也导入了 testing 包，其中注册了很多标志。

运行它与 -h 命令行参数，输出是：

  -port int
        port to use (default 80)
  -test.bench string
        regular expression per path component to select benchmarks to run
  -test.benchmem
        print memory allocations for benchmarks
  -test.benchtime duration
        approximate run time for each benchmark (default 1s)
  -test.blockprofile string
        write a goroutine blocking profile to the named file after execution
  -test.blockprofilerate int
        if >= 0, calls runtime.SetBlockProfileRate() (default 1)
  -test.count n
        run tests and benchmarks n times (default 1)
  -test.coverprofile string
        write a coverage profile to the named file after execution
  -test.cpu string
        comma-separated list of number of CPUs to use for each test
  -test.cpuprofile string
        write a cpu profile to the named file during execution
  -test.memprofile string
        write a memory profile to the named file after execution
  -test.memprofilerate int
        if >=0, sets runtime.MemProfileRate
  -test.outputdir string
        directory in which to write profiles
  -test.parallel int
        maximum test parallelism (default 4)
  -test.run string
        regular expression to select tests and examples to run
  -test.short
        run smaller test suite to save time
  -test.timeout duration
        if positive, sets an aggregate time limit for all tests
  -test.trace string
        write an execution trace to the named file after execution
  -test.v
        verbose: print additional output
exit status 2

如果您不希望您的标志与其他包的标志混合，请通过调用 flag.NewFlagSet() 创建并使用您自己的 flag.FlagSet，当然您必须使用它的方法而不是 flag 包的 top-level 函数。

使用 go build 但我也看到了 -test 标志

Using go build but I also see the -test flags

testing

flags

build

go