diff --git a/tests/functional/tests/security/test_management_fuzzy.py b/tests/functional/tests/security/test_management_fuzzy.py
index b605695..bfbbdde 100644
--- a/tests/functional/tests/security/test_management_fuzzy.py
+++ b/tests/functional/tests/security/test_management_fuzzy.py
@@ -4,10 +4,12 @@
 #
 
 import pytest
+import string
 
 from pyocf.types.cache import (
     Cache,
     CacheMode,
+    CACHE_MODE_NONE,
     CleaningPolicy,
     AlruParams,
     AcpParams,
@@ -18,7 +20,7 @@ from pyocf.types.cache import (
 from pyocf.types.core import Core
 from pyocf.types.volume import Volume
 from pyocf.utils import Size as S
-from tests.utils.random import RandomGenerator, DefaultRanges
+from tests.utils.random import Range, RandomGenerator, DefaultRanges, RandomStringGenerator
 from pyocf.types.shared import OcfError, CacheLineSize, SeqCutOffPolicy
 from ctypes import c_uint64, c_uint32, c_uint8
 
@@ -454,3 +456,137 @@ def test_neg_set_nhit_promotion_policy_param_threshold(pyocf_ctx, cm, cls):
             cache.set_promotion_policy_param(
                 PromotionPolicy.NHIT, NhitParams.INSERTION_THRESHOLD, i
             )
+
+
+@pytest.mark.parametrize("cm", CacheMode)
+@pytest.mark.parametrize("cls", CacheLineSize)
+@pytest.mark.security
+def test_neg_set_ioclass_max_size(pyocf_ctx, cm, cls):
+    """
+    Test whether it is possible to add ioclass with invaild max size
+    :param pyocf_ctx: basic pyocf context fixture
+    :param cm: cache mode we start with
+    :param cls: cache line size we start with
+    :return:
+    """
+    # Start cache device
+    cache_device = Volume(S.from_MiB(30))
+    cache = Cache.start_on_device(cache_device, cache_mode=cm, cache_line_size=cls)
+
+    # Set invalid max size and check if failed
+    for i in RandomGenerator(DefaultRanges.UINT32):
+        if i in ConfValidValues.ioclass_max_size_range:
+            continue
+        with pytest.raises(OcfError, match="Error adding partition to cache"):
+            cache.configure_partition(
+                part_id=1,
+                name="unclassified",
+                max_size=i,
+                priority=0,
+                cache_mode=CACHE_MODE_NONE,
+            )
+            print("\n" + i)
+
+
+@pytest.mark.parametrize("cm", CacheMode)
+@pytest.mark.parametrize("cls", CacheLineSize)
+@pytest.mark.security
+def test_neg_set_ioclass_priority(pyocf_ctx, cm, cls):
+    """
+    Test whether it is possible to add ioclass with invaild priority
+    :param pyocf_ctx: basic pyocf context fixture
+    :param cm: cache mode we start with
+    :param cls: cache line size we start with
+    :return:
+    """
+    # Start cache device
+    cache_device = Volume(S.from_MiB(30))
+    cache = Cache.start_on_device(cache_device, cache_mode=cm, cache_line_size=cls)
+
+    # Set invalid priority and check if failed
+    for i in RandomGenerator(DefaultRanges.INT16):
+        if i in ConfValidValues.ioclass_priority_range:
+            continue
+        with pytest.raises(OcfError, match="Error adding partition to cache"):
+            cache.configure_partition(
+                part_id=1,
+                name="unclassified",
+                max_size=100,
+                priority=i,
+                cache_mode=CACHE_MODE_NONE,
+            )
+            print("\n" + i)
+
+
+@pytest.mark.parametrize("cm", CacheMode)
+@pytest.mark.parametrize("cls", CacheLineSize)
+@pytest.mark.security
+def test_neg_set_ioclass_cache_mode(pyocf_ctx, cm, cls):
+    """
+    Test whether it is possible to add ioclass with invaild cache mode
+    :param pyocf_ctx: basic pyocf context fixture
+    :param cm: cache mode we start with
+    :param cls: cache line size we start with
+    :return:
+    """
+    # Start cache device
+    cache_device = Volume(S.from_MiB(30))
+    cache = Cache.start_on_device(cache_device, cache_mode=cm, cache_line_size=cls)
+
+    # Set invalid cache mode and check if failed
+    for i in RandomGenerator(DefaultRanges.INT):
+        if i in list(CacheMode) + [CACHE_MODE_NONE]:
+            continue
+        with pytest.raises(OcfError, match="Error adding partition to cache"):
+            cache.configure_partition(
+                part_id=1, name="unclassified", max_size=100, priority=1, cache_mode=i
+            )
+            print("\n" + i)
+
+
+@pytest.mark.security
+def test_neg_set_ioclass_name(pyocf_ctx):
+    """
+    Test whether it is possible to add ioclass with invaild name
+    :param pyocf_ctx: basic pyocf context fixture
+    :return:
+    """
+    invalid_chars = [chr(c) for c in range(256) if chr(c) not in string.printable]
+    invalid_chars += [",", '"']
+
+    # Start cache device
+    cache_device = Volume(S.from_MiB(30))
+    cache = Cache.start_on_device(
+        cache_device, cache_mode=CacheMode.WT, cache_line_size=CacheLineSize.LINE_4KiB
+    )
+
+    # Set invalid name and check if failed
+    for name in RandomStringGenerator(
+        len_range=Range(0, 1024), count=10000, extra_chars=invalid_chars
+    ):
+        if not any(c for c in invalid_chars if c in name):
+            continue
+        with pytest.raises(OcfError, match="Error adding partition to cache"):
+            cache.configure_partition(part_id=1, name=name, max_size=100, priority=1)
+            print(f"\n{name}")
+
+
+@pytest.mark.security
+def test_neg_set_ioclass_name_len(pyocf_ctx):
+    """
+    Test whether it is possible to add ioclass with too long name
+    :param pyocf_ctx: basic pyocf context fixture
+    :return:
+    """
+
+    # Start cache device
+    cache_device = Volume(S.from_MiB(30))
+    cache = Cache.start_on_device(
+        cache_device, cache_mode=CacheMode.WT, cache_line_size=CacheLineSize.LINE_4KiB
+    )
+
+    # Set invalid name and check if failed
+    for name in RandomStringGenerator(len_range=Range(1025, 4096), count=10000):
+        with pytest.raises(OcfError, match="Error adding partition to cache"):
+            cache.configure_partition(part_id=1, name=name, max_size=100, priority=1)
+            print(f"\n{name}")