如何在 Golang 中测试参数的传递? [英] How to test the passing of arguments in Golang?
问题描述
package main
import (
"flag"
"fmt"
)
func main() {
passArguments()
}
func passArguments() string {
username := flag.String("user", "root", "Username for this server")
flag.Parse()
fmt.Printf("Your username is %q.", *username)
usernameToString := *username
return usernameToString
}
将参数传递给编译后的代码:
Passing an argument to the compiled code:
./args -user=bla
结果:
您的用户名是bla"
显示已传递的用户名.
目的:为了防止每次都需要手动构建和运行代码来测试代码,目的是编写一个能够测试参数传递的测试.
Aim: in order to prevent that the code needs to be build and run manually every time to test the code the aim is to write a test that is able to test the passing of arguments.
尝试
运行以下测试:
package main
import (
"os"
"testing"
)
func TestArgs(t *testing.T) {
expected := "bla"
os.Args = []string{"-user=bla"}
actual := passArguments()
if actual != expected {
t.Errorf("Test failed, expected: '%s', got: '%s'", expected, actual)
}
}
结果:
Your username is "root".Your username is "root".--- FAIL: TestArgs (0.00s)
args_test.go:15: Test failed, expected: 'bla', got: 'root'
FAIL
coverage: 87.5% of statements
FAIL tool 0.008s
问题
看起来 os.Args = []string{"-user=bla
无法将此参数传递给函数,因为结果是 root
而不是 bla
It looks like that the os.Args = []string{"-user=bla
is not able to pass this argument to the function as the outcome is root
instead of bla
推荐答案
根据我的评论,os.Args
中的第一个值是一个可执行文件本身,所以 os.Args = []string{"cmd", "-user=bla"}
应该可以解决您的问题.您可以从他们正在执行的标准包中查看 flag test类似的东西.
Per my comment, the very first value in os.Args
is a (path to) executable itself, so os.Args = []string{"cmd", "-user=bla"}
should fix your issue. You can take a look at flag test from the standard package where they're doing something similar.
此外,由于 os.Args
是一个全局变量",因此最好保留测试前的状态并在测试后恢复它.与链接测试类似:
Also, as os.Args
is a "global variable", it might be a good idea to keep the state from before the test and restore it after. Similarly to the linked test:
oldArgs := os.Args
defer func() { os.Args = oldArgs }()
这在其他测试中可能很有用,例如,检查调用 go test
时传递的真实参数.
This might be useful where other tests are, for example, examining the real arguments passed when evoking go test
.
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