Go:套件运行后打印文本？

Question

测试包捕获所有输出并且不会打印它，除非测试失败或详细 (-v) 已打开。有没有办法在套件完成后输出文本而不需要打开详细信息？

例如:

func TestMain(m *testing.M) {
    status := m.Run(m)
    fmt.Println("important line to output")
    os.Exit(status)
}

不会打印该行。

---

编辑:我发现如果您从包内部运行测试 (go test)，fmt.Println 将起作用，但如果一个或多个包则无效指定 (go test ./...) 除非启用 -v 选项。

Answer 1

The testing package captures all output and will not print it unless a test fails or verbose (-v) is turned on

是什么让你说 stdout 被捕获了？如果我将此代码保存到 main_test.go 并运行 go test:

package main

import (
    "fmt"
    "os"
    "testing"
)

func TestJoe(t *testing.T) {
    fmt.Println("from joe")
}

func TestMain(m *testing.M) {
    fmt.Println("before run")
    s := m.Run()
    fmt.Println("after run")
    os.Exit(s)
}

我得到:

$ go test
before run
from joe
PASS
after run

---

关于 ./... 的输出，这里是 go help test 的摘录:

The second, called package list mode, occurs when go test is invoked with explicit package arguments (for example 'go test math', 'go test ./...', and even 'go test .'). In this mode, go test compiles and tests each of the packages listed on the command line. If a package test passes, go test prints only the final 'ok' summary line. If a package test fails, go test prints the full test output. If invoked with the -bench or -v flag, go test prints the full output even for passing package tests, in order to display the requested benchmark results or verbose logging.