json - 使用 Echo 测试 POST 请求(预期输出与实际输出)

Question

我是 Go 的新手，所以，如果这是一个愚蠢的问题，我深表歉意。

我最近一直在尝试使用 Echo 的一些 API。我正在尝试测试获取 json 并将其放入数组中的 Go echo 的路由(POST)处理程序。下面是处理程序 ma​​in.go 和测试 test_main.go

的代码

main.go

type Houses struct {
Name    string `json:"name,ommitempty"`
Address string `json:"address,omitempty"`
}

var houses []Houses

func newHouse(c echo.Context) error {
    m := echo.Map{}
    if err := c.Bind(&m); err != nil {
        return err
    }
    dv := Houses{
        Name:    m["name"].(string),
        Address: m["address"].(string),
    }
    houses = append(houses, dv)
    js, _ := json.Marshal(houses)
    fmt.Println(fmt.Sprintf("%s", js))

    return c.JSON(http.StatusOK, string(js))
}

test_main.go

import (
    "net/http"
    "net/http/httptest"
    "strings"
    "testing"

    "github.com/labstack/echo"
    "github.com/stretchr/testify/assert"
)

var userJSON = `{"name":"Jhon Doe","address":"High St."}`

func TestModel(t *testing.T) {
    url := "/new_house"
    e := echo.New()
    req, err := http.NewRequest(http.MethodPost, url, strings.NewReader(userJSON))
    req.Header.Set("Content-Type", "application/json")
    if err != nil {
        t.Errorf("The request could not be created because of: %v", err)
    }
    rec := httptest.NewRecorder()
    c := e.NewContext(req, rec)
    // c.SetPath("/new_house")
    // c.JSON(http.StatusOK, Devices{"Jhon Doe", "Middle Way"})

    res := rec.Result()
    defer res.Body.Close()

    if assert.NoError(t, newHouse(c)) {
        assert.Equal(t, http.StatusOK, rec.Code)
        assert.Equal(t, "["+userJSON+"]", rec.Body.String())
    }
}

即使通过 curl 调用处理程序正常工作，测试也会失败并显示如下错误。

[{"name":"Jhon Doe","address":"High St."}]
--- FAIL: TestModel (0.00s)
    /home/gaidaros/Code/echo-badger/models/model_test.go:34: 
            Error Trace:    model_test.go:34
            Error:          Not equal: 
                            expected: "[{\"name\":\"Jhon Doe\",\"address\":\"High St.\"}]"
                            actual  : "\"[{\\\"name\\\":\\\"Jhon Doe\\\",\\\"address\\\":\\\"High St.\\\"}]\""

                            Diff:
                            --- Expected
                            +++ Actual
                            @@ -1 +1 @@
                            -[{"name":"Jhon Doe","address":"High St."}]
                            +"[{\"name\":\"Jhon Doe\",\"address\":\"High St.\"}]"
            Test:           TestModel
FAIL
exit status 1

经过几天的努力，我无法弄清楚如何使实际输出符合预期，所以我在这里发帖希望能克服这个障碍。感谢您的帮助!

Answer 1

您在 []Houses 上调用 json.Marshal，它将其编码为 JSON 字符串，然后调用 echo.Context.JSON 与 JSON 字符串，它在内部调用 json.Marshal。双重编码导致转义。参见示例。 (为简洁起见省略了错误检查)

https://play.golang.org/p/nYvHS4huy0M

h := &Houses{"Jhon Doe", "High St."}
d, _ := json.Marshal(h)

// double marshal bad
d, _ = json.Marshal(string(d))

fmt.Println(string(d))
// prints "{\"name\":\"Jhon Doe\",\"address\":\"High St.\"}"

您的解决方案是将 slice 传递给您的 c.JSON 调用。作为旁注，您应该能够将结构传递给 c.Bind，而不是使用带有类型断言的映射。