英文:
How to unit test os/exec's cmd.Start() in golang?
问题
我正在尝试在单元测试中模拟cmd.Start()，但无法弄清楚。
我们需要模拟整个函数还是只需要模拟cmd.Start()函数？
有人可以帮我吗？
以下是要翻译的代码部分：
package main
import (
"bytes"
"fmt"
"os/exec"
)
var execCommand = exec.Command
func main() {
stdout := &bytes.Buffer{}
cmd := execCommand("cmd")
syscall.SysProcAttr := &syscall.SysProcAttr{CmdLine: "/S /c C:\\Temp\\test.exe /S C:\\Temp\\test.log";}
cmd.Stdout = stdout
errs := cmd.Start()
if errs != nil {
fmt.Println("command run fialed :", errs)
fmt.Println("OUTPUT :", stdout.String())
}
}
**Unit Test:**
func fakeExecCommand(command string, args ...string) *exec.Cmd {
cs := []string{"-test.run=TestExecCommandHelper", "--", command}
cs = append(cs, args...)
cmd := exec.Command(os.Args[0], cs...)
es := strconv.Itoa(mockedExitStatus)
cmd.Env = []string{"GO_WANT_HELPER_PROCESS=1", "STDOUT=" + mockedStdout, "EXIT_STATUS=" + es}
return cmd
}
请注意，我只会返回翻译好的部分，不会回答关于翻译的问题。
英文:
I'm trying to mock cmd.Start() in Unit test and could not able figure out
Do we need to mock the entire function or can we mock cmd.Start() function?
Can someone help me in this?
package main
import (
"bytes"
"fmt"
"os/exec"
)
var execCommand = exec.Command
func main() {
stdout := &bytes.Buffer{}
cmd := execCommand("cmd")
syscall.SysProcAttr := &syscall.SysProcAttr{CmdLine: "/S /c C:\\Temp\\test.exe /S C:\\Temp\\test.log"}
cmd.Stdout = stdout
errs := cmd.Start()
if errs != nil {
fmt.Println("command run fialed :", errs)
fmt.Println("OUTPUT :", stdout.String())
}
}
Unit Test:
func fakeExecCommand(command string, args ...string) *exec.Cmd {
cs := []string{"-test.run=TestExecCommandHelper", "--", command}
cs = append(cs, args...)
cmd := exec.Command(os.Args[0], cs...)
es := strconv.Itoa(mockedExitStatus)
cmd.Env = []string{"GO_WANT_HELPER_PROCESS=1", "STDOUT=" + mockedStdout, "EXIT_STATUS=" + es}
return cmd
}
答案1
得分: 0
我无法模拟cmd.Start()，无论如何我们都不能这样做，下面是适用于我的方法。
func fakeExecCommand(command string, args ...string) *exec.Cmd {
cs := []string{"-test.run=TestExecCommandHelper", "--", "在这里输入你的命令"}
cs = append(cs, args...)
cmd := exec.Command(os.Args[0], cs...)
es := strconv.Itoa(mockedExitStatus)
cmd.Env = []string{"GO_WANT_HELPER_PROCESS=1", "STDOUT=" + mockedStdout, "EXIT_STATUS=" + es}
return cmd
}
func TestPrintDate(t *testing.T) {
mockedExitStatus = 1
mockedStdout = "Sun Aug 201"
execCommand = fakeExecCommand
defer func() { execCommand = exec.Command }()
expDate := "Sun Aug 20"
out, _ := printDate()
if string(out) != expDate {
t.Errorf("Expected %q, got %q", expDate, string(out))
}
}
func printDate() ([]byte, error) {
cmd := execCommand("date")
out, err := cmd.CombinedOutput()
return out, err
}
参考以下链接：
英文:
I was not able to mock cmd.Start(), we cannot do that anyway and below is the way which worked for me.
func fakeExecCommand(command string, args ...string) *exec.Cmd {
cs := []string{"-test.run=TestExecCommandHelper", "--", "ENTER YOUR COMMAND HERE"}
cs = append(cs, args...)
cmd := exec.Command(os.Args[0], cs...)
es := strconv.Itoa(mockedExitStatus)
cmd.Env = []string{"GO_WANT_HELPER_PROCESS=1", "STDOUT=" + mockedStdout, "EXIT_STATUS=" + es}
return cmd
}
func TestPrintDate(t *testing.T) {
mockedExitStatus = 1
mockedStdout = "Sun Aug 201"
execCommand = fakeExecCommand
defer func() { execCommand = exec.Command }()
expDate := "Sun Aug 20"
out, _ := printDate()
if string(out) != expDate {
t.Errorf("Expected %q, got %q", expDate, string(out))
}
}
/////////CODE///////
func printDate() ([]byte, error) {
cmd := execCommand("date")
out, err := cmd.CombinedOutput()
return out, err
}
Referred below link :
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