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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package httptest provides utilities for HTTP testing.
package httptest

import (
        "bytes"
        "net/http"
)

// ResponseRecorder is an implementation of http.ResponseWriter that
// records its mutations for later inspection in tests.
type ResponseRecorder struct {
        Code      int           // the HTTP response code from WriteHeader
        HeaderMap http.Header   // the HTTP response headers
        Body      *bytes.Buffer // if non-nil, the bytes.Buffer to append written data to
        Flushed   bool
}

// NewRecorder returns an initialized ResponseRecorder.
func NewRecorder() *ResponseRecorder {
        return &ResponseRecorder{
                HeaderMap: make(http.Header),
                Body:      new(bytes.Buffer),
        }
}

// DefaultRemoteAddr is the default remote address to return in RemoteAddr if
// an explicit DefaultRemoteAddr isn't set on ResponseRecorder.
const DefaultRemoteAddr = "1.2.3.4"

// Header returns the response headers.
func (rw *ResponseRecorder) Header() http.Header {
        return rw.HeaderMap
}

// Write always succeeds and writes to rw.Body, if not nil.
func (rw *ResponseRecorder) Write(buf []byte) (int, error) {
        if rw.Body != nil {
                rw.Body.Write(buf)
        }
        if rw.Code == 0 {
                rw.Code = http.StatusOK
        }
        return len(buf), nil
}

// WriteHeader sets rw.Code.
func (rw *ResponseRecorder) WriteHeader(code int) {
        rw.Code = code
}

// Flush sets rw.Flushed to true.
func (rw *ResponseRecorder) Flush() {
        rw.Flushed = true
}