Inject headers into httptest.Recorder so echo context can see them in Golang

Question

I have some tests that inject headers into Echo like this:

func test() {
    request := httptest.NewRequest(http.MethodGet, "/", http.NoBody)
    recorder := httptest.NewRecorder()
    recorder.HeaderMap.Add("If-None-Match", "\"d41d8cd98f00b204e9800998ecf8427e\"")

    context := inst.NewContext(request, recorder)

    testFunc(context)

    fmt.Printf("Status: %d", context.Response().Status)
}

func testFunc(ctx echo.Context) {
    ifNoneMatch := ctx.Response().Header().Get(headers.IfNoneMatch)
    if !util.IsEmpty(ifNoneMatch) && etag == ifNoneMatch {
        ctx.Response().WriteHeader(304)
    }
}

My current solution works but, as HeaderMap is deprecated, I'm trying to find a better way to do this. I've tried injecting the header into Result by doing Result().Header.Add("If-None-Match", "\"d41d8cd98f00b204e9800998ecf8427e\"") but it doesn't seem to show up when calling context.Response().Header(). Is there any way to do this?

Answer 1

Instead of using HeaderMap() which is deprecated, you can use this:

request.Header().Set("Header-name", "Any header")