单元测试 – 单元测试golang处理程序

发布时间：2020-12-16 09:25:56 所属栏目：大数据来源：网络整理

导读：这是我为从 mongodb检索文档而编写的处理程序. 如果找到文档,我们将相应地加载和呈现模板. 如果失败,它将重定向到404. func EventNextHandler(w http.ResponseWriter,r *http.Request) { search := bson.M{"data.start_time": bson.M{"$gte": time.Now()}} s

这是我为从 mongodb检索文档而编写的处理程序.
如果找到文档,我们将相应地加载和呈现模板.
如果失败,它将重定向到404.

func EventNextHandler(w http.ResponseWriter,r *http.Request) {

    search := bson.M{"data.start_time": bson.M{"$gte": time.Now()}}
    sort := "data.start_time"
    var result *Event
    err := db.Find(&Event{},search).Sort(sort).One(&result)
    if err != nil && err != mgo.ErrNotFound {
        panic(err)
    }
    if err == mgo.ErrNotFound {
        fmt.Println("No such object in db. Redirect")
        http.Redirect(w,r,"/404/",http.StatusFound)
        return
    }

    // TODO: 
    // This is the absolute path parsing of template files so tests will pass
    // Code can be better organized
    var eventnext = template.Must(template.ParseFiles(
        path.Join(conf.Config.ProjectRoot,"templates/_base.html"),path.Join(conf.Config.ProjectRoot,"templates/event_next.html"),))

    type templateData struct {
        Context *conf.Context
        E *Event
    }

    data := templateData{conf.DefaultContext(conf.Config),result}

    eventnext.Execute(w,data)

}

手动尝试这一切,一切都很好.

但是,我似乎无法通过我的单元测试.在相应的测试文件中,这是我尝试加载EventNextHandler的测试代码.

func TestEventNextHandler(t *testing.T) {

    // integration test on http requests to EventNextHandler

    request,_ := http.NewRequest("GET","/events/next/",nil)
    response := httptest.NewRecorder()

    EventNextHandler(response,request)

    if response.Code != http.StatusOK {
        t.Fatalf("Non-expected status code%v:ntbody: %v","200",response.Code)
    }

}

测试在说明EventNextHandler(响应,请求)的行处失败.

在我的错误消息中,它引用了我的处理程序代码中的行err：= db.Find(& Event {},search).Sort(sort).One(& result).

完整的错误消息： –

=== RUN TestEventNextHandler
--- FAIL: TestEventNextHandler (0.00 seconds)
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
    panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x8 pc=0x113eb8]

goroutine 4 [running]:
testing.func·004()
    /usr/local/go/src/pkg/testing/testing.go:348 +0xcd
hp/db.Cursor(0xc2000c3cf0,0xc2000fb1c0,0x252d00)
    /Users/calvin/gopath/src/hp/db/db.go:57 +0x98
hp/db.Find(0xc2000c3cf0,0x252d00,0xc2000e55c0,...)
    /Users/calvin/gopath/src/hp/db/db.go:61 +0x2f
hp/event.EventNextHandler(0xc2000e5580,0xc2000a16a0,0xc2000c5680)
    /Users/calvin/gopath/src/hp/event/controllers.go:106 +0x1da
hp/event.TestEventNextHandler(0xc2000d5240)
    /Users/calvin/gopath/src/hp/event/controllers_test.go:16 +0x107
testing.tRunner(0xc2000d5240,0x526fe0)
    /usr/local/go/src/pkg/testing/testing.go:353 +0x8a
created by testing.RunTests
    /usr/local/go/src/pkg/testing/testing.go:433 +0x86b

goroutine 1 [chan receive]:
testing.RunTests(0x3bdff0,0x526fe0,0x1,...)
    /usr/local/go/src/pkg/testing/testing.go:434 +0x88e
testing.Main(0x3bdff0,0x532580,...)
    /usr/local/go/src/pkg/testing/testing.go:365 +0x8a
main.main()
    hp/event/_test/_testmain.go:43 +0x9a

编写测试的正确方法是什么？要考虑从mongodb中检索不到任何内容并应用断言来验证的情况,从而编写经过验证的测试.

解决方法

看来我没有在我的测试中初始化db.就像一个类似于所有其他语言的单元测试框架的“设置”步骤.

我必须确保导入我的db包,然后实现两行连接到数据库并注册索引.

func TestEventNextHandler(t *testing.T) {

    // set up test database

    db.Connect("127.0.0.1","test_db")
    db.RegisterAllIndexes()

    // integration test on http requests to EventNextHandler

    request,request)

    if response.Code != 302 {
        t.Fatalf("Non-expected status code %v:ntbody: %v",response.Code)
    }

}

（编辑：李大同）

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