Add clock tests

Signed-off-by: Vladimir Popov <vladimir.popov@xored.com>

pkg/tools/clock/mock_test.go

@@ -0,0 +1,310 @@
+// Copyright (c) 2021 Doc.ai and/or its affiliates.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// 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 clock_test
+
+import (
+	"context"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+	"go.uber.org/goleak"
+
+	"github.com/networkservicemesh/sdk/pkg/tools/clock"
+)
+
+const (
+	timeout  = 2 * time.Hour
+	testWait = 100 * time.Millisecond
+	testTick = testWait / 100
+)
+
+func TestMock_Timer(t *testing.T) {
+	defer goleak.VerifyNone(t, goleak.IgnoreCurrent())
+
+	m := clock.NewMock()
+
+	timer := m.Timer(timeout)
+
+	select {
+	case <-timer.C():
+		require.FailNow(t, "too early")
+	case <-time.After(testWait):
+	}
+
+	m.Add(timeout / 2)
+
+	select {
+	case <-timer.C():
+		require.FailNow(t, "too early")
+	case <-time.After(testWait):
+	}
+
+	m.Add(timeout / 2)
+
+	select {
+	case <-timer.C():
+	case <-time.After(testWait):
+		require.FailNow(t, "too late")
+	}
+}
+
+func TestMock_Timer_Stop(t *testing.T) {
+	defer goleak.VerifyNone(t, goleak.IgnoreCurrent())
+
+	m := clock.NewMock()
+
+	timer := m.Timer(timeout)
+
+	require.True(t, timer.Stop())
+	require.False(t, timer.Stop())
+
+	m.Add(timeout)
+
+	select {
+	case <-timer.C():
+		require.FailNow(t, "is stopped")
+	case <-time.After(testWait):
+	}
+}
+
+func TestMock_Timer_StopResult(t *testing.T) {
+	defer goleak.VerifyNone(t, goleak.IgnoreCurrent())
+
+	m := clock.NewMock()
+
+	timer := m.Timer(timeout)
+
+	m.Add(timeout)
+	require.False(t, timer.Stop())
+
+	<-timer.C()
+}
+
+func TestMock_Timer_Reset(t *testing.T) {
+	defer goleak.VerifyNone(t, goleak.IgnoreCurrent())
+
+	m := clock.NewMock()
+
+	timer := m.Timer(timeout)
+
+	m.Add(timeout / 2)
+
+	timer.Stop()
+	timer.Reset(timeout)
+
+	m.Add(timeout / 2)
+
+	select {
+	case <-timer.C():
+		require.FailNow(t, "too early")
+	case <-time.After(testWait):
+	}
+
+	m.Add(timeout / 2)
+
+	select {
+	case <-timer.C():
+	case <-time.After(testWait):
+		require.FailNow(t, "too late")
+	}
+}
+
+func TestMock_Timer_ResetExpired(t *testing.T) {
+	defer goleak.VerifyNone(t, goleak.IgnoreCurrent())
+
+	m := clock.NewMock()
+
+	timer := m.Timer(timeout)
+
+	m.Add(timeout)
+
+	timer.Stop()
+	<-timer.C()
+	timer.Reset(timeout)
+
+	m.Add(timeout / 2)
+
+	select {
+	case <-timer.C():
+		require.FailNow(t, "too early")
+	case <-time.After(testWait):
+	}
+
+	m.Add(timeout / 2)
+
+	select {
+	case <-timer.C():
+	case <-time.After(testWait):
+		require.FailNow(t, "too late")
+	}
+}
+
+func TestMock_AfterFunc(t *testing.T) {
+	defer goleak.VerifyNone(t, goleak.IgnoreCurrent())
+
+	m := clock.NewMock()
+
+	var count int32
+	for i := time.Duration(0); i < 10; i++ {
+		m.AfterFunc(timeout*i, func() {
+			atomic.AddInt32(&count, 1)
+		})
+	}
+
+	m.Add(4 * timeout)
+
+	require.Eventually(t, func() bool {
+		return atomic.LoadInt32(&count) == 5
+	}, testWait, testTick)
+
+	require.Never(t, func() bool {
+		return atomic.LoadInt32(&count) > 5
+	}, testWait, testTick)
+
+	m.Add(5 * timeout)
+
+	require.Eventually(t, func() bool {
+		return atomic.LoadInt32(&count) == 10
+	}, testWait, testTick)
+}
+
+func TestMock_AfterFunc_Ticker(t *testing.T) {
+	defer goleak.VerifyNone(t, goleak.IgnoreCurrent())
+
+	m := clock.NewMock()
+
+	ticker := m.Ticker(timeout)
+
+	for i := 0; i < 2; i++ {
+		select {
+		case <-ticker.C():
+			require.FailNow(t, "too early")
+		case <-time.After(testWait):
+		}
+
+		m.Add(timeout / 2)
+
+		select {
+		case <-ticker.C():
+			require.FailNow(t, "too early")
+		case <-time.After(testWait):
+		}
+
+		m.Add(timeout / 2)
+
+		select {
+		case <-ticker.C():
+		case <-time.After(testWait):
+			require.FailNow(t, "too late")
+		}
+	}
+}
+
+func TestMock_WithDeadline(t *testing.T) {
+	defer goleak.VerifyNone(t, goleak.IgnoreCurrent())
+
+	m := clock.NewMock()
+
+	ctx, cancel := m.WithDeadline(context.Background(), m.Now().Add(timeout))
+	defer cancel()
+
+	select {
+	case <-ctx.Done():
+		require.FailNow(t, "too early")
+	case <-time.After(testWait):
+		require.NoError(t, ctx.Err())
+	}
+
+	m.Add(timeout)
+
+	select {
+	case <-ctx.Done():
+		require.Error(t, ctx.Err())
+	case <-time.After(testWait):
+		require.FailNow(t, "too late")
+	}
+}
+
+func TestMock_WithDeadline_Expired(t *testing.T) {
+	defer goleak.VerifyNone(t, goleak.IgnoreCurrent())
+
+	m := clock.NewMock()
+
+	ctx, cancel := m.WithDeadline(context.Background(), m.Now())
+	defer cancel()
+
+	select {
+	case <-ctx.Done():
+		require.Error(t, ctx.Err())
+	case <-time.After(testWait):
+		require.FailNow(t, "too late")
+	}
+}
+
+func TestMock_WithDeadline_ParentCanceled(t *testing.T) {
+	defer goleak.VerifyNone(t, goleak.IgnoreCurrent())
+
+	m := clock.NewMock()
+
+	parentCtx, parentCancel := context.WithCancel(context.Background())
+
+	ctx, cancel := m.WithDeadline(parentCtx, m.Now().Add(timeout))
+	defer cancel()
+
+	select {
+	case <-ctx.Done():
+		require.FailNow(t, "too early")
+	case <-time.After(testWait):
+		require.NoError(t, ctx.Err())
+	}
+
+	parentCancel()
+
+	select {
+	case <-ctx.Done():
+		require.Error(t, ctx.Err())
+	case <-time.After(testWait):
+		require.FailNow(t, "too late")
+	}
+}
+
+func TestMock_WithTimeout(t *testing.T) {
+	defer goleak.VerifyNone(t, goleak.IgnoreCurrent())
+
+	m := clock.NewMock()
+
+	ctx, cancel := m.WithTimeout(context.Background(), timeout)
+	defer cancel()
+
+	select {
+	case <-ctx.Done():
+		require.FailNow(t, "too early")
+	case <-time.After(testWait):
+		require.NoError(t, ctx.Err())
+	}
+
+	m.Add(timeout)
+
+	select {
+	case <-ctx.Done():
+		require.Error(t, ctx.Err())
+	case <-time.After(testWait):
+		require.FailNow(t, "too late")
+	}
+}