1/*
2 *
3 * Copyright 2018 gRPC authors.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 *     http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 */
18
19package health
20
21import (
22	"context"
23	"errors"
24	"reflect"
25	"testing"
26	"time"
27
28	"google.golang.org/grpc/connectivity"
29)
30
31func TestClientHealthCheckBackoff(t *testing.T) {
32	const maxRetries = 5
33
34	var want []time.Duration
35	for i := 0; i < maxRetries; i++ {
36		want = append(want, time.Duration(i+1)*time.Second)
37	}
38
39	var got []time.Duration
40	newStream := func(string) (interface{}, error) {
41		if len(got) < maxRetries {
42			return nil, errors.New("backoff")
43		}
44		return nil, nil
45	}
46
47	oldBackoffFunc := backoffFunc
48	backoffFunc = func(ctx context.Context, retries int) bool {
49		got = append(got, time.Duration(retries+1)*time.Second)
50		return true
51	}
52	defer func() { backoffFunc = oldBackoffFunc }()
53
54	clientHealthCheck(context.Background(), newStream, func(connectivity.State) {}, "test")
55
56	if !reflect.DeepEqual(got, want) {
57		t.Fatalf("Backoff durations for %v retries are %v. (expected: %v)", maxRetries, got, want)
58	}
59}
60