我正在通過測試學習圍棋。從“Head First Go”的第 2 章末尾，我得到了以下程序。它讓用戶嘗試從 1 到 10 猜測一個數字 3 次：guess.gopackage mainimport ( "fmt" "math/rand" "time" "bufio" "os" "log" "strconv" "strings")func generateRandomNumber() int { rand.Seed(time.Now().Unix()) // seed value based on time to generate non-deterministic random values randomNum := rand.Intn(10) + 1 // range: [0, 10); produces the same value without Seed(), i.e., pseudo-random return randomNum}func guess() int { var success bool = false target := generateRandomNumber() fmt.Println("Guess a number between 1 and 10") guess := bufio.NewReader(os.Stdin) for attempts := 0; attempts < 3; attempts++ { fmt.Println("You have", 3-attempts, "guesses left") userVal, err := guess.ReadString('\n') if err != nil { log.Fatal(err) } input := strings.TrimSpace(userVal) answer, err := strconv.Atoi(input) if err != nil { log.Fatal(err) } if answer == target { fmt.Println("Congratulations !!") return answer } else if answer > target { fmt.Println("Your guess was HIGHER") } else if answer < target { fmt.Println("Your guess was LOWER") } } if !success { fmt.Printf("Sorry, you've run out of attempts... The correct value is %d\n", target) return target } return 0}func main() { guess()}guess_test.gopackage mainimport ( "testing")func TestRandomNumber(t *testing.T) { want := generateRandomNumber() if 7 != want { t.Fail() t.Logf("Incorrect guess; The random number was %d", want) }}如何guess()通過傳入三個不同的輸入進行測試？我想通過比較 with 的返回值來進行guess()測試generateRandomNumber()。
1 回答
繁花如伊
TA貢獻2012條經驗 獲得超12個贊
您可以更改guess函數以從輸入中獲取閱讀器，這樣我們就可以將它傳遞給我們想要的任何閱讀器：在主要我們通過stdin閱讀器，在測試中我們通過模擬閱讀器：
guess.go
package main
import (
"bufio"
"fmt"
"log"
"math/rand"
"os"
"strconv"
"strings"
"time"
)
func generateRandomNumber() int {
rand.Seed(time.Now().Unix()) // seed value based on time to generate non-deterministic random values
randomNum := rand.Intn(10) + 1 // range: [0, 10); produces the same value without Seed(), i.e., pseudo-random
return randomNum
}
func guess(reader *bufio.Reader) (int, error) {
target := generateRandomNumber()
fmt.Println("Guess a number between 1 and 10")
for attempts := 0; attempts < 3; attempts++ {
fmt.Println("You have", 3-attempts, "guesses left")
userVal, err := reader.ReadString('\n')
if err != nil {
log.Fatal(err)
}
input := strings.TrimSpace(userVal)
answer, err := strconv.Atoi(input)
if err != nil {
log.Fatal(err)
}
if answer == target {
fmt.Println("Congratulations !!")
return answer, nil
} else if answer > target {
fmt.Println("Your guess was HIGHER")
} else if answer < target {
fmt.Println("Your guess was LOWER")
}
}
fmt.Printf("Sorry, you've run out of attempts... The correct value is %d\n", target)
return target, fmt.Errorf("attempts is over")
}
func main() {
reader := bufio.NewReader(os.Stdin)
guess(reader)
}
用于檢測：
guess_test.go
package main
import (
"bufio"
"fmt"
"strings"
"testing"
)
func TestRandomNumberOk(t *testing.T) {
want := generateRandomNumber()
msg := fmt.Sprintf("3\n4\n%d\n", want)
reader := strings.NewReader(msg)
r := bufio.NewReader(reader)
_, err := guess(r)
if err != nil {
t.Errorf("guess must successfull")
}
}
func TestRandomNumberFail(t *testing.T) {
want := generateRandomNumber()
msg := fmt.Sprintf("3\n4\n%d\n", want+1)
reader := strings.NewReader(msg)
r := bufio.NewReader(reader)
_, err := guess(r)
if err == nil {
t.Errorf("guess must unsuccessfull")
}
}
我不得不更改您的猜測返回值，因為它何時成功與否未知
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