如何为 BindJSON 设置模拟 gin.Context

Question

我正在设置测试Go。

我用go-sqlmockGo Gin 作为框架来测试 mysql 连接。现在我尝试测试mysql插入逻辑。

问题是我需要设置稍后gin.Context使用的模拟BindJSON。但到目前为止
我还不能设置这个。gin.Context

server side: golang
db: mysql
web framework: gin

道戈

server side: golang
db: mysql
web framework: gin

dao_test.go

unc PostImageToDBDao(c *gin.Context, db *sql.DB) {
        // Because of this logic, I need to set gin.Context with json
    var imageData util.ImageData
    c.BindJSON(&imageData)

    for _, imageName := range imageData.IMAGENAMES {
        ins, err := db.Prepare("INSERT INTO images(article_uuid, image_name) VALUES(?,?)")
        if err != nil {
            log.Fatal(err)
        }
        ins.Exec(imageData.ARTICLEUUID, imageName.NAME)
    }
}

我希望模拟gin.Context能够正确设置并运行而go test -v不会出现错误，但是它失败并出现以下错误：

=== RUN   TestPostImageToDBDao
[GIN-debug] [WARNING] Headers were already written. Wanted to override status code 0 with 400
--- FAIL: TestPostImageToDBDao (0.00s)
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
        panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x60 pc=0x15bde75]

goroutine 50 [running]:
testing.tRunner.func1(0xc000234100)
        /usr/local/go/src/testing/testing.go:830 +0x392
panic(0x16918e0, 0x1ce5850)
        /usr/local/go/src/runtime/panic.go:522 +0x1b5
github.com/gin-gonic/gin.(*Context).AbortWithStatus(0xc00026aee8, 0x190)
        /Users/jpskgc/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:146 +0x45
github.com/gin-gonic/gin.(*Context).AbortWithError(0xc0000d9ee8, 0x190, 0x1863e00, 0xc0002700a0, 0x1863e00)
        /Users/jpskgc/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:162 +0x39
github.com/gin-gonic/gin.(*Context).MustBindWith(0xc00026aee8, 0x16328e0, 0xc00022c180, 0x186e060, 0x1d16588, 0x1e316d0, 0x0)
        /Users/jpskgc/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:561 +0x92
github.com/gin-gonic/gin.(*Context).BindJSON(...)
        /Users/jpskgc/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:528
article/api/dao.PostImageToDBDao(0xc00026aee8, 0xc000276000)
        /Users/jpskgc/article/api/dao/dao.go:54 +0x87
article/api/dao.TestPostImageToDBDao(0xc000234100)
        /Users/jpskgc/article/api/dao/dao_test.go:204 +0x4b6
testing.tRunner(0xc000234100, 0x17897e0)
        /usr/local/go/src/testing/testing.go:865 +0xc0
created by testing.(*T).Run
        /usr/local/go/src/testing/testing.go:916 +0x35a
exit status 2
FAIL    article/api/dao 0.032s

Answer 1

首先，您必须实例化一个测试*gin.Context并确保其*http.Request非零：

    w := httptest.NewRecorder()
    c, _ := gin.CreateTestContext(w) 

    c.Request = &http.Request{
        Header: make(http.Header),
    }

然后你可以通过以下方式模拟 POST json 正文：

    w := httptest.NewRecorder()
    c, _ := gin.CreateTestContext(w) 

    c.Request = &http.Request{
        Header: make(http.Header),
    }

其中函数参数content interface{}是可以使用 编组到 JSON 中的任何内容json.Marshal()，因此在大多数情况下是具有正确json标签的结构体，或者是map[string]interface{}.

用法示例：

func TestMyHandler(t *testing.T) {
    w := httptest.NewRecorder()
    ctx, _ := gin.CreateTestContext(w) 

    ctx.Request = &http.Request{
        Header: make(http.Header),
    }


    MockJsonPost(ctx, map[string]interface{}{"foo": "bar"})
    
    MyHandler(ctx)
    assert.EqualValues(t, http.StatusOK, w.Code)
} 

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