英文:
How to write tests against user input in Go
问题
如何对来自fmt.Scan/Scanf/Scanln的用户输入进行测试？
例如，我如何测试函数输入是否接受“4 5\n”和“1 2 3 4\n”并从STDIN返回n == 5和array == [1, 2, 3, 4]。
package main
import (
"fmt"
)
// input从用户获取一个数组。
func input() (m int, array []int) {
fmt.Print("输入数组的大小n和差值m：")
var n int
_, err := fmt.Scanf("%d %d", &n, &m)
if err != nil {
panic(err)
}
fmt.Print("输入数组作为以空格分隔的字符串：")
array = make([]int, n)
for i := 0; i < n; i++ {
_, _ = fmt.Scan(&array[i])
}
return m, array
}
func main() {
m, array := input()
fmt.Println(m, array)
}
英文:
How would I test against user input from fmt.Scan/Scanf/Scanln?
For example how could I test that the function input will accept "4 5\n" and "1 2 3 4\n" from STDIN and return n == 5 and array == [1, 2, 3, 4].
package main
import (
"fmt"
)
// input gets an array from the user.
func input() (m int, array []int) {
fmt.Print("Enter the size of the array, n, and the difference, m: ")
var n int
_, err := fmt.Scanf("%d %d", &n, &m)
if err != nil {
panic(err)
}
fmt.Print("Enter the array as a space seperated string: ")
array = make([]int, n)
for i := 0; i < n; i++ {
_, _ = fmt.Scan(&array[i])
}
return m, array
}
func main() {
m, array := input()
fmt.Println(m, array)
}
答案1
得分: 20
这是一个非常初步的草稿，用于说明原则。
program.go
package main
import (
"fmt"
"os"
)
// input从用户获取一个数组。
func input(in *os.File) (m int, array []int) {
if in == nil {
in = os.Stdin
}
fmt.Print("输入数组的大小n和差值m：")
var n int
_, err := fmt.Fscanf(in, "%d %d", &n, &m)
if err != nil {
panic(err)
}
fmt.Print("输入数组，以空格分隔：")
array = make([]int, n)
for i := 0; i < n; i++ {
_, _ = fmt.Fscan(in, &array[i])
}
return m, array
}
func main() {
m, array := input(nil)
fmt.Println(m, array)
}
program_test.go
package main
import (
"fmt"
"io"
"io/ioutil"
"os"
"testing"
)
func TestInput(t *testing.T) {
var (
n, m int
array []int
)
in, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer in.Close()
_, err = io.WriteString(in, "4 5\n"+"1 2 3 4\n")
if err != nil {
t.Fatal(err)
}
_, err = in.Seek(0, os.SEEK_SET)
if err != nil {
t.Fatal(err)
}
n, array = input(in)
if n != 5 || fmt.Sprintf("%v", array) != fmt.Sprintf("%v", []int{1, 2, 3, 4}) {
t.Error("unexpected results:", n, m, array)
}
}
输出：
$ go test
ok command-line-arguments 0.010s
英文:
Here's a very rough draft to illustrate the principle.
program.go
package main
import (
"fmt"
"os"
)
// input gets an array from the user.
func input(in *os.File) (m int, array []int) {
if in == nil {
in = os.Stdin
}
fmt.Print("Enter the size of the array, n, and the difference, m: ")
var n int
_, err := fmt.Fscanf(in, "%d %d", &n, &m)
if err != nil {
panic(err)
}
fmt.Print("Enter the array as a space seperated string: ")
array = make([]int, n)
for i := 0; i < n; i++ {
_, _ = fmt.Fscan(in, &array[i])
}
return m, array
}
func main() {
m, array := input(nil)
fmt.Println(m, array)
}
program_test.go
package main
import (
"fmt"
"io"
"io/ioutil"
"os"
"testing"
)
func TestInput(t *testing.T) {
var (
n, m int
array []int
)
in, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer in.Close()
_, err = io.WriteString(in, "4 5\n"+"1 2 3 4\n")
if err != nil {
t.Fatal(err)
}
_, err = in.Seek(0, os.SEEK_SET)
if err != nil {
t.Fatal(err)
}
n, array = input(in)
if n != 5 || fmt.Sprintf("%v", array) != fmt.Sprintf("%v", []int{1, 2, 3, 4}) {
t.Error("unexpected results:", n, m, array)
}
}
Output:
$ go test
ok command-line-arguments 0.010s
答案2
得分: -10
你不能。至少不是那么容易，以至于值得付出努力。
英文:
You can't. At least not so easily, such that, it would be worth the effort.
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