Fix imports

Signed-off-by: Katarzyna Treder <katarzyna.treder@h-partners.com>

test/functional/tests/incremental_load/test_core_pool.py

@@ -1,11 +1,11 @@
 #
 # Copyright(c) 2019-2022 Intel Corporation
+# Copyright(c) 2024 Huawei Technologies Co., Ltd.
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
 import pytest
 
-import test_tools.fs_tools
 from api.cas import casadm
 from api.cas.core import CoreStatus
 from core.test_run import TestRun
@@ -90,7 +90,7 @@ def test_core_pool_exclusive_open():
         core_disk = TestRun.disks["core"]
         core_disk.create_partitions([Size(1, Unit.GibiByte)])
         core_dev = core_disk.partitions[0]
-        test_tools.fs_utils.create_filesystem(Filesystem.ext4)
+        core_dev.create_filesystem(Filesystem.ext4)
         cache_id = 1
         core_id = 1
 
@@ -127,7 +127,7 @@ def test_core_pool_exclusive_open():
     with TestRun.step("Check if it is impossible to make filesystem on the core device "
                       "from core pool."):
         try:
-            test_tools.fs_utils.create_filesystem(Filesystem.ext4, force=False)
+            core_dev.create_filesystem(Filesystem.ext4, force=False)
             TestRun.fail("Successfully created filesystem on core from core pool, "
                          "this is unexpected behaviour.")
         except Exception: