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vendor/google.golang.org/api/gensupport/backoff_test.go

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+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// 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.
+
+package gensupport
+
+import (
+	"testing"
+	"time"
+)
+
+func TestBackoff(t *testing.T) {
+	eb := &ExponentialBackoff{Base: time.Millisecond, Max: time.Second}
+
+	var total time.Duration
+	for n, max := 0, 2*time.Millisecond; ; n, max = n+1, max*2 {
+		if n > 100 {
+			// There's less than 1 in 10^28 of taking longer than 100 iterations,
+			// so this is just to check we don't have an infinite loop.
+			t.Fatalf("Failed to timeout after 100 iterations.")
+		}
+		pause, retry := eb.Pause()
+		if !retry {
+			break
+		}
+
+		if 0 > pause || pause >= max {
+			t.Errorf("Iteration %d: pause = %v; want in range [0, %v)", n, pause, max)
+		}
+		total += pause
+	}
+
+	if total < time.Second {
+		t.Errorf("Total time = %v; want > %v", total, time.Second)
+	}
+}