How can I hard code a json string into an *http.Response for testing purposes in Go

Question

I have some code that makes get requests to a dynamic website, which I want to test. Obviously the tests need to be run by anyone at any time, so rather than actually use the REST API, is it possible to put a json string into an *http.Response for testing purposes.

example code:

func get (c *http.Response, err error) (string, error) {
    //code
}

test file:

func TestGet(t *testing.T) {
    //code to have put json string for test *http.Response
    get(???, nil)

}

Do you want somehow unmarshal a json string into an http.Response object? You can read a saved response via http.ReadResponse — Mr_Pink
– Mr_Pink, Commented Sep 23, 2016 at 20:00

hobbs · Accepted Answer · 2016-09-23 19:56:52Z

2

You want to use a bytes.Buffer to turn the data you have into an io.Reader, and NopCloser (from io/ioutil) to make it an io.ReadCloser

r := &http.Response{
    Status: "200 OK",
    StatusCode: 200,
    // etc., lots more fields needed here.
    Body: ioutil.NopCloser(bytes.NewBufferString(json))
}

If you have your json in a []byte, then use NewBuffer instead of NewBufferString.

answered Sep 23, 2016 at 19:56

hobbs

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2 Comments

user6586806 Over a year ago

Is the json in this case a string, and if so, how do I hard code json as a string (since it will have multiple quotes in the json

hobbs Over a year ago

@user6586806 your question implied you already had a JSON string. Anyway, you can use the raw string (`like this`) quotes.

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