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// Copyright 2020 The gVisor Authors.
//
// 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 faketime_test
import (
"testing"
"time"
"gvisor.dev/gvisor/pkg/tcpip/faketime"
)
func TestManualClockAdvance(t *testing.T) {
const timeout = time.Millisecond
clock := faketime.NewManualClock()
start := clock.NowMonotonic()
clock.Advance(timeout)
if got, want := time.Duration(clock.NowMonotonic()-start)*time.Nanosecond, timeout; got != want {
t.Errorf("got = %d, want = %d", got, want)
}
}
func TestManualClockAfterFunc(t *testing.T) {
const (
timeout1 = time.Millisecond // timeout for counter1
timeout2 = 2 * time.Millisecond // timeout for counter2
)
tests := []struct {
name string
advance time.Duration
wantCounter1 int
wantCounter2 int
}{
{
name: "before timeout1",
advance: timeout1 - 1,
wantCounter1: 0,
wantCounter2: 0,
},
{
name: "timeout1",
advance: timeout1,
wantCounter1: 1,
wantCounter2: 0,
},
{
name: "timeout2",
advance: timeout2,
wantCounter1: 1,
wantCounter2: 1,
},
{
name: "after timeout2",
advance: timeout2 + 1,
wantCounter1: 1,
wantCounter2: 1,
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
clock := faketime.NewManualClock()
counter1 := 0
counter2 := 0
clock.AfterFunc(timeout1, func() {
counter1++
})
clock.AfterFunc(timeout2, func() {
counter2++
})
start := clock.NowMonotonic()
clock.Advance(test.advance)
if got, want := counter1, test.wantCounter1; got != want {
t.Errorf("got counter1 = %d, want = %d", got, want)
}
if got, want := counter2, test.wantCounter2; got != want {
t.Errorf("got counter2 = %d, want = %d", got, want)
}
if got, want := time.Duration(clock.NowMonotonic()-start)*time.Nanosecond, test.advance; got != want {
t.Errorf("got elapsed = %d, want = %d", got, want)
}
})
}
}
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