Fix the dep on cenkalti

vendor/github.com/cenkalti/backoff/ticker_test.go

@@ -0,0 +1,94 @@
+package backoff
+
+import (
+	"errors"
+	"fmt"
+	"log"
+	"testing"
+	"time"
+
+	"golang.org/x/net/context"
+)
+
+func TestTicker(t *testing.T) {
+	const successOn = 3
+	var i = 0
+
+	// This function is successful on "successOn" calls.
+	f := func() error {
+		i++
+		log.Printf("function is called %d. time\n", i)
+
+		if i == successOn {
+			log.Println("OK")
+			return nil
+		}
+
+		log.Println("error")
+		return errors.New("error")
+	}
+
+	b := NewExponentialBackOff()
+	ticker := NewTicker(b)
+
+	var err error
+	for _ = range ticker.C {
+		if err = f(); err != nil {
+			t.Log(err)
+			continue
+		}
+
+		break
+	}
+	if err != nil {
+		t.Errorf("unexpected error: %s", err.Error())
+	}
+	if i != successOn {
+		t.Errorf("invalid number of retries: %d", i)
+	}
+}
+
+func TestTickerContext(t *testing.T) {
+	const cancelOn = 3
+	var i = 0
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	// This function cancels context on "cancelOn" calls.
+	f := func() error {
+		i++
+		log.Printf("function is called %d. time\n", i)
+
+		// cancelling the context in the operation function is not a typical
+		// use-case, however it allows to get predictable test results.
+		if i == cancelOn {
+			cancel()
+		}
+
+		log.Println("error")
+		return fmt.Errorf("error (%d)", i)
+	}
+
+	b := WithContext(NewConstantBackOff(time.Millisecond), ctx)
+	ticker := NewTicker(b)
+
+	var err error
+	for _ = range ticker.C {
+		if err = f(); err != nil {
+			t.Log(err)
+			continue
+		}
+
+		break
+	}
+	if err == nil {
+		t.Errorf("error is unexpectedly nil")
+	}
+	if err.Error() != "error (3)" {
+		t.Errorf("unexpected error: %s", err.Error())
+	}
+	if i != cancelOn {
+		t.Errorf("invalid number of retries: %d", i)
+	}
+}