simplify interface

[podhmo]

• don't use WithJSON(), use the facade of creating *http.Request
• Client have Do() method only

[podhmo]

before

c := webtest.NewClientFromHandler(http.HandlerFunc(Add))
var want interface{}
got, err := c.Post("/",
    webtest.WithJSON(bytes.NewBufferString(`{"values": [1,2,3]}`)),
    webtest.WithTripperware(
        tripperware.ExpectCode(t, 200),
        tripperware.GetExpectedDataFromSnapshot(t, &want),
    ),
)

[podhmo]

hmm..

        got, err := c.Do(
            webtest.NewRequest(
                "POST", "/",
                webtest.WithJSON(bytes.NewBufferString(`{"values": [1,2,3]}`)),
            ),
            webtest.WithTripperware(
                tripperware.ExpectCode(t, 200),
                tripperware.GetExpectedDataFromSnapshot(t, &want),
            ),
        )

[podhmo]

no.