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http_server.go
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http_server.go
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package helpers
import (
"encoding/json"
"fmt"
"io"
"net/http"
"net/http/httptest"
"testing"
"github.com/stretchr/testify/assert"
)
type ExpectedRequest struct {
Url string `json:"url"`
Expect interface{} `json:"expect"`
}
func GetTestHttpServer(responses map[string][]byte, expects ...ExpectedRequest) (server *httptest.Server, after func()) {
testServer := httptest.NewServer(http.HandlerFunc(func(res http.ResponseWriter, req *http.Request) {
reqUrl := req.URL.String()
if data, ok := responses[reqUrl]; ok {
//check requests
for _, expectation := range expects {
if expectation.Url == reqUrl {
expectData, _ := json.Marshal(expectation.Expect)
actualData, _ := io.ReadAll(req.Body)
if string(expectData) != string(actualData) {
res.WriteHeader(500)
msg := fmt.Sprintf("expected actual request data:\n%s \nto equal expected data: %s", string(actualData), string(expectData))
d, _ := json.Marshal(map[string]string{
"errorMessage": msg,
})
res.Write(d)
return
}
}
}
res.Header().Add("Content-Type", "application/json")
res.WriteHeader(200)
res.Write(data)
return
}
res.WriteHeader(500)
msg := fmt.Sprintf("unable to find mock request mapping: %s", reqUrl)
fmt.Println(msg)
d, _ := json.Marshal(map[string]string{
"errorMessage": msg,
})
res.Write(d)
}))
return testServer, func() {
testServer.Close()
}
}
type Request struct {
Method string
Status int
Url string
Result []byte
ExpectInput interface{}
ValidateCall func(t *testing.T, req *http.Request)
}
func GetTestHttpServerWithRequests(t *testing.T, reqs []Request) (server *httptest.Server) {
mReqs := make(map[string]Request)
for _, req := range reqs {
mReqs[fmt.Sprintf("%s__%s", req.Method, req.Url)] = req
}
testServer := httptest.NewServer(http.HandlerFunc(func(res http.ResponseWriter, req *http.Request) {
reqUrl := req.URL.String()
key := fmt.Sprintf("%s__%s", req.Method, reqUrl)
r, ok := mReqs[key]
if !ok {
res.WriteHeader(500)
msg := fmt.Sprintf("unable to find mock request mapping: %s", key)
fmt.Println(msg)
d, _ := json.Marshal(map[string]string{
"errorMessage": msg,
})
res.Write(d)
return
}
if r.ValidateCall != nil {
r.ValidateCall(t, req)
}
//check requests
if r.ExpectInput != nil {
if expected, ok := r.ExpectInput.([]byte); ok {
var isValid bool
actualData, _ := io.ReadAll(req.Body)
defer req.Body.Close()
switch string(expected[0]) {
case "{", "[":
// Assert JSON
isValid = assert.JSONEq(t, string(expected), string(actualData))
default:
isValid = assert.Equal(t, string(expected), string(actualData))
}
if !isValid {
res.WriteHeader(500)
msg := fmt.Sprintf("expected actual request data:\n%s \nto equal expected data: %s", string(actualData), string(expected))
d, _ := json.Marshal(map[string]string{
"errorMessage": msg,
})
res.Write(d)
return
}
} else {
// is not byte array, this is error
res.WriteHeader(500)
d, _ := json.Marshal(map[string]string{
"errorMessage": "expected input (ExpectInput) must be byte array containing JSON",
})
res.Write(d)
return
}
}
res.Header().Add("Content-Type", "application/json")
res.WriteHeader(r.Status)
res.Write(r.Result)
}))
t.Cleanup(func() {
testServer.Close()
})
return testServer
}