vendor

vendor/github.com/google/certificate-transparency-go/jsonclient/backoff_test.go

@@ -0,0 +1,117 @@
+// 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 jsonclient
+
+import (
+	"math"
+	"testing"
+	"time"
+)
+
+const testLeeway = 25 * time.Microsecond
+
+func fuzzyTimeEquals(a, b time.Time, leeway time.Duration) bool {
+	diff := math.Abs(float64(a.Sub(b).Nanoseconds()))
+	if diff < float64(leeway.Nanoseconds()) {
+		return true
+	}
+	return false
+}
+
+func fuzzyDurationEquals(a, b time.Duration, leeway time.Duration) bool {
+	diff := math.Abs(float64(a.Nanoseconds() - b.Nanoseconds()))
+	if diff < float64(leeway.Nanoseconds()) {
+		return true
+	}
+	return false
+}
+
+func TestBackoff(t *testing.T) {
+	b := backoff{}
+
+	// Test that the interval increases as expected
+	for i := uint(0); i < maxMultiplier; i++ {
+		n := time.Now()
+		interval := b.set(nil)
+		if interval != time.Second*(1<<i) {
+			t.Fatalf("backoff.set(nil)=%v; want %v", interval, time.Second*(1<<i))
+		}
+		expected := n.Add(interval)
+		until := b.until()
+		if !fuzzyTimeEquals(expected, until, time.Millisecond) {
+			t.Fatalf("backoff.until()=%v; want %v (+ 0-250ms)", expected, until)
+		}
+
+		// reset notBefore
+		b.notBefore = time.Time{}
+	}
+
+	// Test that multiplier doesn't go above maxMultiplier
+	b.multiplier = maxMultiplier
+	b.notBefore = time.Time{}
+	interval := b.set(nil)
+	if b.multiplier > maxMultiplier {
+		t.Fatalf("backoff.multiplier=%v; want %v", b.multiplier, maxMultiplier)
+	}
+	if interval > time.Second*(1<<(maxMultiplier-1)) {
+		t.Fatalf("backoff.set(nil)=%v; want %v", interval, 1<<(maxMultiplier-1)*time.Second)
+	}
+
+	// Test decreaseMultiplier properly decreases the multiplier
+	b.multiplier = 1
+	b.notBefore = time.Time{}
+	b.decreaseMultiplier()
+	if b.multiplier != 0 {
+		t.Fatalf("backoff.multiplier=%v; want %v", b.multiplier, 0)
+	}
+
+	// Test decreaseMultiplier doesn't reduce multiplier below 0
+	b.decreaseMultiplier()
+	if b.multiplier != 0 {
+		t.Fatalf("backoff.multiplier=%v; want %v", b.multiplier, 0)
+	}
+}
+
+func TestBackoffOverride(t *testing.T) {
+	b := backoff{}
+	for _, tc := range []struct {
+		notBefore        time.Time
+		override         time.Duration
+		expectedInterval time.Duration
+	}{
+		{
+			notBefore:        time.Now().Add(time.Hour),
+			override:         time.Second * 1800,
+			expectedInterval: time.Hour,
+		},
+		{
+			notBefore:        time.Now().Add(time.Hour),
+			override:         time.Second * 7200,
+			expectedInterval: 2 * time.Hour,
+		},
+		{
+			notBefore:        time.Time{},
+			override:         time.Second * 7200,
+			expectedInterval: 2 * time.Hour,
+		},
+	} {
+		b.multiplier = 0
+		b.notBefore = tc.notBefore
+		interval := b.set(&tc.override)
+		if !fuzzyDurationEquals(tc.expectedInterval, interval, testLeeway) {
+			t.Fatalf("backoff.set(%v)=%v; want %v", tc.override, interval, tc.expectedInterval)
+		}
+	}
+}