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test.go
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test.go
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// Copyright (c) 2017 VMware, Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package test
import (
"bytes"
"io"
"net/http"
"net/http/httptest"
"strings"
"github.com/gorilla/mux"
)
// RequestHandlerMapping is a mapping between request and its handler
type RequestHandlerMapping struct {
// Method is the method the request used
Method string
// Pattern is the pattern the request must match
Pattern string
// Handler is the handler which handles the request
Handler func(http.ResponseWriter, *http.Request)
}
// ServeHTTP ...
func (rhm *RequestHandlerMapping) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if len(rhm.Method) != 0 && r.Method != strings.ToUpper(rhm.Method) {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
rhm.Handler(w, r)
}
// Response is a response used for unit test
type Response struct {
// StatusCode is the status code of the response
StatusCode int
// Headers are the headers of the response
Headers map[string]string
// Boby is the body of the response
Body []byte
}
// Handler returns a handler function which handle requst according to
// the response provided
func Handler(resp *Response) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
if resp == nil {
return
}
for k, v := range resp.Headers {
w.Header().Add(http.CanonicalHeaderKey(k), v)
}
if resp.StatusCode == 0 {
resp.StatusCode = http.StatusOK
}
w.WriteHeader(resp.StatusCode)
if len(resp.Body) != 0 {
io.Copy(w, bytes.NewReader(resp.Body))
}
}
}
// NewServer creates a HTTP server for unit test
func NewServer(mappings ...*RequestHandlerMapping) *httptest.Server {
r := mux.NewRouter()
for _, mapping := range mappings {
r.PathPrefix(mapping.Pattern).Handler(mapping).Methods(mapping.Method)
}
return httptest.NewServer(r)
}