From e03d906cb73df5c65f3bc105191ff796c5d1264e Mon Sep 17 00:00:00 2001
From: Alex Vanin <alexey@nspcc.ru>
Date: Wed, 20 Jan 2021 21:13:18 +0300
Subject: [PATCH] [#334] engine: Make tests more predictable

There is a codecov issue because objects are not placed
in the engine the same way every unit test. Therefore
sometimes there are more coverage, sometimes there are
less. Seeded RNG should solve this issue for engine tests.

Signed-off-by: Alex Vanin <alexey@nspcc.ru>
---
 pkg/local_object_storage/blobovnicza/blobovnicza_test.go | 4 +++-
 pkg/local_object_storage/blobstor/blobovnicza_test.go    | 4 +++-
 pkg/local_object_storage/metabase/db_test.go             | 2 +-
 pkg/local_object_storage/shard/shard_test.go             | 2 +-
 4 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/pkg/local_object_storage/blobovnicza/blobovnicza_test.go b/pkg/local_object_storage/blobovnicza/blobovnicza_test.go
index c603479ce5..923933d53f 100644
--- a/pkg/local_object_storage/blobovnicza/blobovnicza_test.go
+++ b/pkg/local_object_storage/blobovnicza/blobovnicza_test.go
@@ -1,8 +1,8 @@
 package blobovnicza
 
 import (
-	"crypto/rand"
 	"crypto/sha256"
+	"math/rand"
 	"os"
 	"testing"
 
@@ -70,6 +70,8 @@ func testGet(t *testing.T, blz *Blobovnicza, addr *objectSDK.Address, expObj []b
 }
 
 func TestBlobovnicza(t *testing.T) {
+	rand.Seed(1024)
+
 	p := "./test_blz"
 
 	sizeLim := uint64(256 * 1 << 10) // 256KB
diff --git a/pkg/local_object_storage/blobstor/blobovnicza_test.go b/pkg/local_object_storage/blobstor/blobovnicza_test.go
index d1cf3aaa61..833d72428f 100644
--- a/pkg/local_object_storage/blobstor/blobovnicza_test.go
+++ b/pkg/local_object_storage/blobstor/blobovnicza_test.go
@@ -1,9 +1,9 @@
 package blobstor
 
 import (
-	"crypto/rand"
 	"crypto/sha256"
 	"errors"
+	"math/rand"
 	"os"
 	"testing"
 
@@ -55,6 +55,8 @@ func testObject(sz uint64) *object.Object {
 }
 
 func TestBlobovniczas(t *testing.T) {
+	rand.Seed(1024)
+
 	l := test.NewLogger(false)
 	p := "./test_blz"
 
diff --git a/pkg/local_object_storage/metabase/db_test.go b/pkg/local_object_storage/metabase/db_test.go
index 6a2f3a6389..d996cbab14 100644
--- a/pkg/local_object_storage/metabase/db_test.go
+++ b/pkg/local_object_storage/metabase/db_test.go
@@ -1,8 +1,8 @@
 package meta_test
 
 import (
-	"crypto/rand"
 	"crypto/sha256"
+	"math/rand"
 	"os"
 	"testing"
 
diff --git a/pkg/local_object_storage/shard/shard_test.go b/pkg/local_object_storage/shard/shard_test.go
index 0d243bc362..5e2465f814 100644
--- a/pkg/local_object_storage/shard/shard_test.go
+++ b/pkg/local_object_storage/shard/shard_test.go
@@ -1,8 +1,8 @@
 package shard_test
 
 import (
-	"crypto/rand"
 	"crypto/sha256"
+	"math/rand"
 	"os"
 	"path"
 	"testing"