diff --git a/tests/test_graphql/test_api_storage.py b/tests/test_graphql/test_api_storage.py
index 497db12b..5d49dda7 100644
--- a/tests/test_graphql/test_api_storage.py
+++ b/tests/test_graphql/test_api_storage.py
@@ -1,4 +1,20 @@
-from typing import ByteString
+import pytest
+
+
+class BlockDevicesMockReturnNone:
+    """Mock BlockDevices"""
+
+    def __init__(self, args, **kwargs):
+        self.args = args
+        self.kwargs = kwargs
+
+    def get_block_device(self, name: str):
+        return None
+
+    def resize(self):
+        pass
+
+    returncode = 0
 
 
 class BlockDevicesMock:
@@ -8,20 +24,33 @@ class BlockDevicesMock:
         self.args = args
         self.kwargs = kwargs
 
-    def get_block_device(name: str):  # pylint: disable=no-method-argument
-        return None
+    def get_block_device(self, name: str):
+        return 0
+
+    def resize(self):
+        pass
 
     returncode = 0
 
 
-@ByteString.fixture
-def mock_get_block_device(mocker):
-    mock = mocker.patch("BlockDevices", autospec=True)
+@pytest.fixture
+def mock_block_device_return_none(mocker):
+    mock = mocker.patch(
+        "selfprivacy_api.graphql.mutations.storage_mutation.BlockDevices", autospec=True
+    )
+    return mock
+
+
+@pytest.fixture
+def mock_block_device_return(mocker):
+    mock = mocker.patch(
+        "selfprivacy_api.graphql.mutations.storage_mutation.BlockDevices", autospec=True
+    )
     return mock
 
 
 API_RESIZE_VOLUME_MUTATION = """
-mutation resizeVolume($name: str!) {
+mutation resizeVolume($name: String!) {
     resizeVolume(name: $name) {
         success
         message
@@ -30,14 +59,27 @@ mutation resizeVolume($name: str!) {
 }
 """
 
-def test_graphql_get_nonexistent_block_device(authorized_client, mock_get_block_device):
+
+def test_graphql_resize_volumea_unathorized_client(client, mock_block_device):
+    response = client.post(
+        "/graphql",
+        json={
+            "query": API_RESIZE_VOLUME_MUTATION,
+            "variables": {"name": "sdx"},
+        },
+    )
+    assert response.status_code == 200
+    assert response.json().get("data") is None
+
+
+def test_graphql_resize_volume_nonexistent_block_device(
+    authorized_client, mock_block_device
+):
     response = authorized_client.post(
         "/graphql",
         json={
             "query": API_RESIZE_VOLUME_MUTATION,
-            "variables": {
-                "name": "sdc"
-            },
+            "variables": {"name": "sdx"},
         },
     )
     assert response.status_code == 200
@@ -46,3 +88,19 @@ def test_graphql_get_nonexistent_block_device(authorized_client, mock_get_block_
     assert response.json()["data"]["resizeVolume"]["code"] == 404
     assert response.json()["data"]["resizeVolume"]["message"] is not None
     assert response.json()["data"]["resizeVolume"]["success"] is False
+
+
+def test_graphql_resize_volume(authorized_client, mock_block_device):
+    response = authorized_client.post(
+        "/graphql",
+        json={
+            "query": API_RESIZE_VOLUME_MUTATION,
+            "variables": {"name": "sdx"},
+        },
+    )
+    assert response.status_code == 200
+    assert response.json().get("data") is not None
+
+    assert response.json()["data"]["resizeVolume"]["code"] == 200
+    assert response.json()["data"]["resizeVolume"]["message"] is not None
+    assert response.json()["data"]["resizeVolume"]["success"] is True