鑒于如何sort.Slice(array, func(int, int) bool)在傳入函數中使用數組，您將如何為匿名函數編寫測試？來自go 文檔sort.Slice()的示例代碼是：package mainimport ( "fmt" "sort")func main() { people := []struct { Name string Age int }{ {"Gopher", 7}, {"Alice", 55}, {"Vera", 24}, {"Bob", 75}, } sort.Slice(people, func(i, j int) bool { return people[i].Name < people[j].Name }) fmt.Println("By name:", people) sort.Slice(people, func(i, j int) bool { return people[i].Age < people[j].Age }) fmt.Println("By age:", people)}如果將匿名函數分解為兩個單獨的函數（例如，comparePeopleByName(i, j int)和comparePeopleByAge(i, j, int)），您將如何測試它們？將函數綁定到閉包上似乎是個奇怪的想法。注意：我認為測試sort.Slice()自己是一種不好的形式；它隨語言一起提供，不應該（需要？）進行測試。
2 回答
慕斯709654
TA貢獻1840條經驗 獲得超5個贊
package main
import (
"fmt"
"sort"
)
func main() {
people := []struct {
Name string
Age int
}{
{"Gopher", 7},
{"Alice", 55},
{"Vera", 24},
{"Bob", 75},
}
sort.Slice(people, func(i, j int) bool { return people[i].Name < people[j].Name })
fmt.Println("By name:", people)
sort.Slice(people, func(i, j int) bool { return people[i].Age < people[j].Age })
fmt.Println("By age:", people)
}
如果將匿名函數分解為兩個單獨的函數（例如，comparePeopleByName(i, j int)和comparePeopleByAge(i, j, int)），您將如何測試它們？
將函數綁定到閉包上似乎是個奇怪的想法。
注意：我認為測試sort.Slice()自己是一種不好的形式；它隨語言一起提供，不應該（需要？）進行測試。
桃花長相依
TA貢獻1860條經驗 獲得超8個贊
胡思亂想后，我寫了這段代碼。它使用工廠來創建方法，以便切片包含在函數的閉包中。
我把它放在一個要點中以便于玩弄：https ://gist.github.com/docwhat/e3b13265d24471651e02f7d7a42e7d2c
// main.go
package main
import (
"fmt"
"sort"
)
type Person struct {
Name string
Age int
}
func comparePeopleByName(people []Person) func(int, int) bool {
return func(i, j int) bool {
return people[i].Name < people[j].Name
}
}
func comparePeopleByAge(people []Person) func(int, int) bool {
return func(i, j int) bool {
return people[i].Age < people[j].Age
}
}
func main() {
people := []Person{
{"Gopher", 7},
{"Alice", 55},
{"Vera", 24},
{"Bob", 75},
}
sort.Slice(people, comparePeopleByName(people))
fmt.Println("By name:", people)
sort.Slice(people, comparePeopleByAge(people))
fmt.Println("By age:", people)
}
// main_test.go
package main
import "testing"
func TestComparePeopleByName(t *testing.T) {
testCases := []struct {
desc string
a, b Person
expected bool
}{
{"a < b", Person{"bob", 1}, Person{"krabs", 2}, true},
{"a > b", Person{"krabs", 1}, Person{"bob", 2}, false},
{"a = a", Person{"plankton", 1}, Person{"plankton", 2}, false},
}
for _, testCase := range testCases {
t.Run(testCase.desc, func(t *testing.T) {
people := []Person{testCase.a, testCase.b}
got := comparePeopleByName(people)(0, 1)
if testCase.expected != got {
t.Errorf("expected %v, got %v", testCase.expected, got)
}
})
}
}
func TestComparePeopleByAge(t *testing.T) {
testCases := []struct {
desc string
a, b Person
expected bool
}{
{"a < b", Person{"sandy", 10}, Person{"patrick", 20}, true},
{"a > b", Person{"sandy", 30}, Person{"patrick", 20}, false},
{"a = b", Person{"sandy", 90}, Person{"patrick", 90}, false},
}
for _, testCase := range testCases {
t.Run(testCase.desc, func(t *testing.T) {
people := []Person{testCase.a, testCase.b}
got := comparePeopleByAge(people)(0, 1)
if testCase.expected != got {
t.Errorf("expected %v, got %v", testCase.expected, got)
}
})
}
}
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