[#1634] node: Change default epoch in tests

Do not treat objects with expiration as expired by default.

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

pkg/local_object_storage/engine/engine_test.go

@@ -2,7 +2,6 @@ package engine
 
 import (
 	"fmt"
-	"math"
 	"os"
 	"path/filepath"
 	"testing"
@@ -31,7 +30,7 @@ import (
 type epochState struct{}
 
 func (s epochState) CurrentEpoch() uint64 {
-	return math.MaxUint64
+	return 0
 }
 
 func BenchmarkExists(b *testing.B) {

pkg/local_object_storage/metabase/db_test.go

@@ -1,7 +1,6 @@
 package meta_test
 
 import (
-	"math"
 	"os"
 	"strconv"
 	"testing"
@@ -29,7 +28,7 @@ func (s epochState) CurrentEpoch() uint64 {
 		return s.e
 	}
 
-	return math.MaxUint64
+	return 0
 }
 
 // saves "big" object in DB.

pkg/local_object_storage/metabase/version_test.go

@@ -4,7 +4,6 @@ import (
 	"encoding/binary"
 	"errors"
 	"fmt"
-	"math"
 	"path/filepath"
 	"testing"
 
@@ -15,7 +14,7 @@ import (
 type epochStateImpl struct{}
 
 func (s epochStateImpl) CurrentEpoch() uint64 {
-	return math.MaxUint64
+	return 0
 }
 
 func TestVersion(t *testing.T) {

pkg/local_object_storage/shard/control_test.go

@@ -1,7 +1,6 @@
 package shard
 
 import (
-	"math"
 	"os"
 	"path/filepath"
 	"testing"
@@ -28,7 +27,7 @@ import (
 type epochState struct{}
 
 func (s epochState) CurrentEpoch() uint64 {
-	return math.MaxUint64
+	return 0
 }
 
 func TestShardOpen(t *testing.T) {

pkg/local_object_storage/shard/shard_test.go

@@ -2,7 +2,6 @@ package shard_test
 
 import (
 	"crypto/sha256"
-	"math"
 	"math/rand"
 	"path/filepath"
 	"testing"
@@ -30,7 +29,7 @@ import (
 type epochState struct{}
 
 func (s epochState) CurrentEpoch() uint64 {
-	return math.MaxUint64
+	return 0
 }
 
 func newShard(t testing.TB, enableWriteCache bool) *shard.Shard {