[#1527] engine/test: Allow to specify current epoch in epochState

Signed-off-by: Aleksey Savchuk <a.savchuk@yadro.com>

pkg/local_object_storage/engine/engine_test.go

@@ -17,10 +17,12 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-type epochState struct{}
+type epochState struct {
+	currEpoch uint64
+}
 
 func (s epochState) CurrentEpoch() uint64 {
-	return 0
+	return s.currEpoch
 }
 
 type testEngineWrapper struct {