Unit testing an HTTP handler that returns multiple file streams

#php editor Strawberry will introduce in this article how to unit test an HTTP handler that returns multiple file streams. During the development process, we often encounter situations where multiple file streams need to be returned, such as image compression, file merging, etc. However, unit testing in this case is not that easy to implement. In this article, we'll explore how to use the appropriate tools and techniques to write effective unit tests to ensure that our HTTP handlers return multiple file streams correctly.

Question content

http handler

I have an http handler like this:

func routehandler(c echo.context) error {
    outs := make([]io.reader, 5)
    for i := range outs {
        outs[i] = // ... comes from a logic.
    }

    return c.stream(http.statusok, "application/binary", io.multireader(outs...))
}

unit test

I'm planning to write a unit test for an http handler and investigate the return stream for multiple files.

My unit tests have these helper types and functions:

type handler func(echo.context) error

// send request to a handler. get back response body.
func send(req *http.request, handler handler) ([]byte, error) {
    w := httptest.newrecorder()
    e := echo.new()
    c := e.newcontext(req, w)
    // call the handler.
    err := handler(c)
    if err != nil {
        return nil, err
    }
    res := w.result()
    defer res.body.close()
    return ioutil.readall(res.body)
}

I then send a request to the http handler from the unit test using the above types and functions:

// From within my unit test:

// Initialize request...

var data []byte
data, err := Send(request, RouteHandler)

// How to separate the multiple files returned here?
// How to work with the returned data?

Processing the returned file stream

How to separate multiple files returned by http handler? How to use the data stream returned by http handler?

Workaround

...Possible options: write length followed by file content...

Actually, the above option commented by @CeriseLimón is already implemented and used by the frontend.

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