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transport_test.go
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transport_test.go
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package hedgehog
import (
"context"
"errors"
"net/http"
"net/http/httptest"
"regexp"
"sync/atomic"
"testing"
"time"
)
func tserv(method string, path string, codes []int, delays []time.Duration) (string, context.CancelFunc) {
var i int64
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
if req.Method == method && req.URL.Path == path {
n := atomic.AddInt64(&i, 1) - 1
code := http.StatusOK
delay := ms_0
if n < int64(len(codes)) {
code = codes[n]
}
if n < int64(len(delays)) {
delay = delays[n]
}
time.Sleep(delay)
w.WriteHeader(code)
return
}
w.WriteHeader(http.StatusNotFound)
}))
return srv.URL, srv.Close
}
func unwrapHTTPError(err error) string {
if err == nil {
return "nil"
}
if err := errors.Unwrap(err); err != nil {
return err.Error()
}
return err.Error()
}
func TestRoundTripper(t *testing.T) {
type treq struct {
method string
path string
codes []int
delays []time.Duration
}
type tresp struct {
code int
delay time.Duration
err error
}
ctxCanceled, cancel := context.WithCancel(context.TODO())
cancel()
ttable := map[string]struct {
ctx context.Context
calls uint64
res []Resource
tcall struct {
req treq
resp tresp
}
}{
"should execute default transport if no matching resources found method": {
ctx: context.TODO(),
calls: 1,
res: []Resource{NewResourceStatic(http.MethodGet, regexp.MustCompile(`profile`), ms_1, http.StatusOK)},
tcall: struct {
req treq
resp tresp
}{
req: treq{
method: http.MethodHead,
path: "/profile",
codes: []int{http.StatusOK, http.StatusOK},
},
resp: tresp{
code: http.StatusOK,
},
},
},
"should execute default transport if no matching resources found path": {
ctx: context.TODO(),
calls: 1,
res: []Resource{NewResourceStatic(http.MethodGet, regexp.MustCompile(`users`), ms_1, http.StatusOK)},
tcall: struct {
req treq
resp tresp
}{
req: treq{
method: http.MethodGet,
path: "/profile",
codes: []int{http.StatusOK, http.StatusOK},
},
resp: tresp{
code: http.StatusOK,
},
},
},
"should return error back on canceled request and matching resources": {
ctx: ctxCanceled,
calls: 1,
res: []Resource{NewResourceStatic(http.MethodPut, regexp.MustCompile(`profile`), ms_1, http.StatusOK)},
tcall: struct {
req treq
resp tresp
}{
req: treq{
method: http.MethodPut,
path: "/profile",
codes: []int{http.StatusOK, http.StatusOK},
},
resp: tresp{
err: ctxCanceled.Err(),
},
},
},
"should return error back on unexpected response status code and matching resources": {
ctx: context.TODO(),
calls: 1,
res: []Resource{NewResourceStatic(http.MethodDelete, regexp.MustCompile(`profile`), ms_1, http.StatusOK)},
tcall: struct {
req treq
resp tresp
}{
req: treq{
method: http.MethodDelete,
path: "/profile",
codes: []int{http.StatusConflict, http.StatusForbidden},
delays: []time.Duration{ms_50, ms_2},
},
resp: tresp{
err: ErrResourceUnexpectedResponseCode{StatusCode: http.StatusForbidden},
},
},
},
"should return response back on successful response and matching resources": {
ctx: context.TODO(),
calls: 1,
res: []Resource{NewResourceStatic(http.MethodGet, regexp.MustCompile(`profile`), ms_1, http.StatusOK)},
tcall: struct {
req treq
resp tresp
}{
req: treq{
method: http.MethodGet,
path: "/profile",
codes: []int{http.StatusOK, http.StatusOK},
},
resp: tresp{
code: http.StatusOK,
},
},
},
"should return response back on successful response and first matching resources": {
ctx: context.TODO(),
calls: 1,
res: []Resource{
NewResourceStatic(http.MethodGet, regexp.MustCompile(`user`), ms_1, http.StatusOK),
NewResourceStatic(http.MethodPut, regexp.MustCompile(`profile`), ms_1, http.StatusOK),
NewResourceStatic(http.MethodGet, regexp.MustCompile(`profile`), ms_5, http.StatusOK),
NewResourceStatic(http.MethodGet, regexp.MustCompile(`profile`), ms_100, http.StatusOK),
},
tcall: struct {
req treq
resp tresp
}{
req: treq{
method: http.MethodGet,
path: "/profile",
codes: []int{http.StatusNotFound, http.StatusOK},
},
resp: tresp{
code: http.StatusOK,
delay: ms_50,
},
},
},
"should return response back on successful response and matching resources even if first request failed": {
ctx: context.TODO(),
calls: 1,
res: []Resource{NewResourceStatic(http.MethodGet, regexp.MustCompile(`profile`), ms_1, http.StatusOK)},
tcall: struct {
req treq
resp tresp
}{
req: treq{
method: http.MethodGet,
path: "/profile",
codes: []int{http.StatusForbidden, http.StatusOK},
},
resp: tresp{
code: http.StatusOK,
},
},
},
"should return response back on successful response and matching resources multi calls": {
ctx: context.TODO(),
calls: 3,
res: []Resource{NewResourceStatic(http.MethodGet, regexp.MustCompile(`profile/[0-9]`), ms_1, http.StatusOK)},
tcall: struct {
req treq
resp tresp
}{
req: treq{
method: http.MethodGet,
path: "/profile/7",
codes: []int{http.StatusOK, http.StatusOK, http.StatusOK, http.StatusOK},
delays: []time.Duration{ms_100, ms_2, ms_100, ms_5, ms_100},
},
resp: tresp{
code: http.StatusOK,
delay: ms_50,
},
},
},
}
for tname, tcase := range ttable {
t.Run(tname, func(t *testing.T) {
cli := NewHTTPClient(nil, tcase.calls, tcase.res...)
uri, stop := tserv(tcase.tcall.req.method, tcase.tcall.req.path, tcase.tcall.req.codes, tcase.tcall.req.delays)
req, _ := http.NewRequest(tcase.tcall.req.method, uri+tcase.tcall.req.path, nil)
req = req.WithContext(tcase.ctx)
ts := time.Now()
resp, err := cli.Do(req)
ds := time.Since(ts)
stop()
if unwrapHTTPError(tcase.tcall.resp.err) != unwrapHTTPError(err) {
t.Fatalf("expected err %v but got %v", unwrapHTTPError(tcase.tcall.resp.err), unwrapHTTPError(err))
}
if tcase.tcall.resp.code != 0 && tcase.tcall.resp.code != resp.StatusCode {
t.Fatalf("expected response status code %d but got %d", tcase.tcall.resp.code, resp.StatusCode)
}
if tcase.tcall.resp.delay != 0 && tcase.tcall.resp.delay < ds {
t.Fatalf("expected response latency be < %s but got %s", tcase.tcall.resp.delay, ds)
}
})
}
}