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metadata_go113_test.go
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metadata_go113_test.go
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// Copyright 2016 Google LLC
//
// 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.
//go:build go1.13
// +build go1.13
package metadata
import (
"io"
"io/ioutil"
"net/http"
"strings"
"testing"
)
func TestRetry(t *testing.T) {
tests := []struct {
name string
timesToFail int
failCode int
failErr error
response string
}{
{
name: "no retries",
response: "test",
},
{
name: "retry 500 once",
response: "test",
failCode: 500,
timesToFail: 1,
},
{
name: "retry io.ErrUnexpectedEOF once",
response: "test",
failErr: io.ErrUnexpectedEOF,
timesToFail: 1,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
ft := &failingTransport{
timesToFail: tt.timesToFail,
failCode: tt.failCode,
failErr: tt.failErr,
response: tt.response,
}
c := NewClient(&http.Client{Transport: ft})
s, err := c.Get("")
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
if ft.called != ft.failedAttempts+1 {
t.Fatalf("failed %d times, want %d", ft.called, ft.failedAttempts+1)
}
if s != tt.response {
t.Fatalf("c.Get() = %q, want %q", s, tt.response)
}
})
}
}
type failingTransport struct {
timesToFail int
failCode int
failErr error
response string
failedAttempts int
called int
}
func (r *failingTransport) RoundTrip(req *http.Request) (*http.Response, error) {
r.called++
if r.failedAttempts < r.timesToFail {
r.failedAttempts++
if r.failErr != nil {
return nil, r.failErr
}
return &http.Response{StatusCode: r.failCode}, nil
}
return &http.Response{StatusCode: http.StatusOK, Body: ioutil.NopCloser(strings.NewReader(r.response))}, nil
}