我完全不知道如何在不使用任何其他包(如 golang/mock)的情况下模拟一个函数。我只是想学习如何这样做,但找不到很多像样的在线资源。
本质上,我 followed this excellent article这解释了如何使用接口(interface)来模拟事物。
因此,我重新编写了我想测试的函数。该函数只是将一些数据插入数据存储区。我对此的测试没问题——我可以直接模拟该函数。
我遇到的问题是在我尝试测试的 http 路由“内”模拟它。我正在使用 Gin 框架。
我的路由器(简化版)如下所示:
func SetupRouter() *gin.Engine {
r := gin.Default()
r.Use(gin.Logger())
r.Use(gin.Recovery())
v1 := r.Group("v1")
v1.PATCH("operations/:id", controllers.UpdateOperation)
}
其中调用了 UpdateOperation 函数:
func UpdateOperation(c *gin.Context) {
id := c.Param("id")
r := m.Response{}
str := m.OperationInfoer{}
err := m.FindAndCompleteOperation(str, id, r.Report)
if err == nil {
c.JSON(200, gin.H{
"message": "Operation completed",
})
}
}
所以,我需要模拟 FindAndCompleteOperation() 函数。
主要(简化)函数如下所示:
func (oi OperationInfoer) FindAndCompleteOp(id string, report Report) error {
ctx := context.Background()
q := datastore.NewQuery("Operation").
Filter("Unique_Id =", id).
Limit(1)
var ops []Operation
if ts, err := db.Datastore.GetAll(ctx, q, &ops); err == nil {
{
if len(ops) > 0 {
ops[0].Id = ts[0].ID()
ops[0].Complete = true
// Do stuff
_, err := db.Datastore.Put(ctx, key, &o)
if err == nil {
log.Print("OPERATION COMPLETED")
}
}
}
}
err := errors.New("Not found")
return err
}
func FindAndCompleteOperation(ri OperationInfoer, id string, report Report) error {
return ri.FindAndCompleteOp(id, report)
}
type OperationInfoer struct{}
为了测试更新操作的路由,我有这样的东西:
FIt("Return 200, updates operation", func() {
testRouter := SetupRouter()
param := make(url.Values)
param["access_token"] = []string{public_token}
report := m.Report{}
report.Success = true
report.Output = "my output"
jsonStr, _ := json.Marshal(report)
req, _ := http.NewRequest("PATCH", "/v1/operations/123?"+param.Encode(), bytes.NewBuffer(jsonStr))
resp := httptest.NewRecorder()
testRouter.ServeHTTP(resp, req)
Expect(resp.Code).To(Equal(200))
o := FakeResponse{}
json.NewDecoder(resp.Body).Decode(&o)
Expect(o.Message).To(Equal("Operation completed"))
})
最初,我试图作弊,只是尝试了这样的事情:
m.FindAndCompleteOperation = func(string, m.Report) error {
return nil
}
但这会影响所有其他测试等。
我希望有人能简单地解释模拟 FindAndCompleteOperation 函数的最佳方法是什么,这样我就可以测试路由,而不依赖于数据存储等。
最佳答案
我对类似问题有另一个相关的、信息量更大的答案 here ,但这是针对您的特定情况的答案:
更新您的 SetupRouter()
函数以获取可以是真正的 FindAndCompleteOperation
函数或 stub 函数的函数:
package main
import "github.com/gin-gonic/gin"
// m.Response.Report
type Report struct {
// ...
}
// m.OperationInfoer
type OperationInfoer struct {
// ...
}
type findAndComplete func(s OperationInfoer, id string, report Report) error
func FindAndCompleteOperation(OperationInfoer, string, Report) error {
// ...
return nil
}
func SetupRouter(f findAndComplete) *gin.Engine {
r := gin.Default()
r.Group("v1").PATCH("/:id", func(c *gin.Context) {
if f(OperationInfoer{}, c.Param("id"), Report{}) == nil {
c.JSON(200, gin.H{"message": "Operation completed"})
}
})
return r
}
func main() {
r := SetupRouter(FindAndCompleteOperation)
if err := r.Run(":8080"); err != nil {
panic(err)
}
}
测试/模拟示例
package main
import (
"encoding/json"
"net/http/httptest"
"strings"
"testing"
)
func TestUpdateRoute(t *testing.T) {
// build findAndComplete stub
var callCount int
var lastInfoer OperationInfoer
var lastID string
var lastReport Report
stub := func(s OperationInfoer, id string, report Report) error {
callCount++
lastInfoer = s
lastID = id
lastReport = report
return nil // or `fmt.Errorf("Err msg")` if you want to test fault path
}
// invoke endpoint
w := httptest.NewRecorder()
r := httptest.NewRequest(
"PATCH",
"/v1/id_value",
strings.NewReader(""),
)
SetupRouter(stub).ServeHTTP(w, r)
// check that the stub was invoked correctly
if callCount != 1 {
t.Fatal("Wanted 1 call; got", callCount)
}
if lastInfoer != (OperationInfoer{}) {
t.Fatalf("Wanted %v; got %v", OperationInfoer{}, lastInfoer)
}
if lastID != "id_value" {
t.Fatalf("Wanted 'id_value'; got '%s'", lastID)
}
if lastReport != (Report{}) {
t.Fatalf("Wanted %v; got %v", Report{}, lastReport)
}
// check that the correct response was returned
if w.Code != 200 {
t.Fatal("Wanted HTTP 200; got HTTP", w.Code)
}
var body map[string]string
if err := json.Unmarshal(w.Body.Bytes(), &body); err != nil {
t.Fatal("Unexpected error:", err)
}
if body["message"] != "Operation completed" {
t.Fatal("Wanted 'Operation completed'; got %s", body["message"])
}
}
关于testing - Golang 中的模拟函数来测试我的 http 路由,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39723345/