Official Go implementation of the Ethereum protocol
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go-ethereum/common/mclock/alarm_test.go

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// Copyright 2022 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package mclock
import "testing"
// This test checks basic functionality of Alarm.
func TestAlarm(t *testing.T) {
clk := new(Simulated)
clk.Run(20)
a := NewAlarm(clk)
a.Schedule(clk.Now() + 10)
if recv(a.C()) {
t.Fatal("Alarm fired before scheduled deadline")
}
if ntimers := clk.ActiveTimers(); ntimers != 1 {
t.Fatal("clock has", ntimers, "active timers, want", 1)
}
clk.Run(5)
if recv(a.C()) {
t.Fatal("Alarm fired too early")
}
clk.Run(5)
if !recv(a.C()) {
t.Fatal("Alarm did not fire")
}
if recv(a.C()) {
t.Fatal("Alarm fired twice")
}
if ntimers := clk.ActiveTimers(); ntimers != 0 {
t.Fatal("clock has", ntimers, "active timers, want", 0)
}
a.Schedule(clk.Now() + 5)
if recv(a.C()) {
t.Fatal("Alarm fired before scheduled deadline when scheduling the second event")
}
clk.Run(5)
if !recv(a.C()) {
t.Fatal("Alarm did not fire when scheduling the second event")
}
if recv(a.C()) {
t.Fatal("Alarm fired twice when scheduling the second event")
}
}
// This test checks that scheduling an Alarm to an earlier time than the
// one already scheduled works properly.
func TestAlarmScheduleEarlier(t *testing.T) {
clk := new(Simulated)
clk.Run(20)
a := NewAlarm(clk)
a.Schedule(clk.Now() + 50)
clk.Run(5)
a.Schedule(clk.Now() + 1)
clk.Run(3)
if !recv(a.C()) {
t.Fatal("Alarm did not fire")
}
}
// This test checks that scheduling an Alarm to a later time than the
// one already scheduled works properly.
func TestAlarmScheduleLater(t *testing.T) {
clk := new(Simulated)
clk.Run(20)
a := NewAlarm(clk)
a.Schedule(clk.Now() + 50)
clk.Run(5)
a.Schedule(clk.Now() + 100)
clk.Run(50)
if !recv(a.C()) {
t.Fatal("Alarm did not fire")
}
}
// This test checks that scheduling an Alarm in the past makes it fire immediately.
func TestAlarmNegative(t *testing.T) {
clk := new(Simulated)
clk.Run(50)
a := NewAlarm(clk)
a.Schedule(-1)
clk.Run(1) // needed to process timers
if !recv(a.C()) {
t.Fatal("Alarm did not fire for negative time")
}
}
func recv(ch <-chan struct{}) bool {
select {
case <-ch:
return true
default:
return false
}
}