diff --git a/src/cpl_core/pipes/ip_address_pipe.py b/src/cpl_core/pipes/ip_address_pipe.py
index 00dc43b0..71e5c0b4 100644
--- a/src/cpl_core/pipes/ip_address_pipe.py
+++ b/src/cpl_core/pipes/ip_address_pipe.py
@@ -13,7 +13,7 @@ class IPAddressPipe(PipeABC):
 
         for i in range(0, len(value)):
             byte = value[i]
-            if byte > 255:
+            if byte > 255 or byte < 0:
                 raise Exception("Invalid IP")
 
             if i == len(value) - 1:
diff --git a/unittests/unittests_core/core_test_suite.py b/unittests/unittests_core/core_test_suite.py
index a50d9b90..ede67d9e 100644
--- a/unittests/unittests_core/core_test_suite.py
+++ b/unittests/unittests_core/core_test_suite.py
@@ -1,5 +1,8 @@
 import unittest
 
+from unittests_core.pipes.bool_pipe_test_case import BoolPipeTestCase
+from unittests_core.pipes.ip_address_pipe_test_case import IPAddressTestCase
+from unittests_core.pipes.version_pipe_test_case import VersionPipeTestCase
 from unittests_core.utils.credential_manager_test_case import CredentialManagerTestCase
 from unittests_core.utils.json_processor_test_case import JSONProcessorTestCase
 from unittests_core.utils.string_test_case import StringTestCase
@@ -10,9 +13,19 @@ class CoreTestSuite(unittest.TestSuite):
         unittest.TestSuite.__init__(self)
 
         loader = unittest.TestLoader()
-        self.addTests(loader.loadTestsFromTestCase(CredentialManagerTestCase))
-        self.addTests(loader.loadTestsFromTestCase(JSONProcessorTestCase))
-        self.addTests(loader.loadTestsFromTestCase(StringTestCase))
+        tests = [
+            # pipes
+            BoolPipeTestCase,
+            IPAddressTestCase,
+            VersionPipeTestCase,
+            # utils
+            CredentialManagerTestCase,
+            JSONProcessorTestCase,
+            StringTestCase,
+        ]
+
+        for test in tests:
+            self.addTests(loader.loadTestsFromTestCase(test))
 
     def run(self, *args):
         super().run(*args)
diff --git a/unittests/unittests_core/pipes/__init__.py b/unittests/unittests_core/pipes/__init__.py
new file mode 100644
index 00000000..425ab6c1
--- /dev/null
+++ b/unittests/unittests_core/pipes/__init__.py
@@ -0,0 +1 @@
+# imports
diff --git a/unittests/unittests_core/pipes/bool_pipe_test_case.py b/unittests/unittests_core/pipes/bool_pipe_test_case.py
new file mode 100644
index 00000000..99af412b
--- /dev/null
+++ b/unittests/unittests_core/pipes/bool_pipe_test_case.py
@@ -0,0 +1,14 @@
+import unittest
+
+from cpl_core.pipes import BoolPipe
+
+
+class BoolPipeTestCase(unittest.TestCase):
+    def setUp(self):
+        pass
+
+    def test_transform(self):
+        pipe = BoolPipe()
+
+        self.assertEqual("True", pipe.transform(True))
+        self.assertEqual("False", pipe.transform(False))
diff --git a/unittests/unittests_core/pipes/ip_address_pipe_test_case.py b/unittests/unittests_core/pipes/ip_address_pipe_test_case.py
new file mode 100644
index 00000000..218bdb6a
--- /dev/null
+++ b/unittests/unittests_core/pipes/ip_address_pipe_test_case.py
@@ -0,0 +1,20 @@
+import unittest
+
+from cpl_core.pipes import IPAddressPipe
+
+
+class IPAddressTestCase(unittest.TestCase):
+    def setUp(self):
+        pass
+
+    def test_transform(self):
+        pipe = IPAddressPipe()
+
+        self.assertEqual("192.168.178.1", pipe.transform([192, 168, 178, 1]))
+        self.assertEqual("255.255.255.255", pipe.transform([255, 255, 255, 255]))
+        self.assertEqual("0.0.0.0", pipe.transform([0, 0, 0, 0]))
+
+        self.assertRaises(Exception, lambda: pipe.transform([-192, 168, 178, 1]))
+        self.assertRaises(Exception, lambda: pipe.transform([256, 168, 178, 1]))
+        self.assertRaises(Exception, lambda: pipe.transform([256, 168, 178]))
+        self.assertRaises(Exception, lambda: pipe.transform([256, 168, 178, 1, 1]))
diff --git a/unittests/unittests_core/pipes/version_pipe_test_case.py b/unittests/unittests_core/pipes/version_pipe_test_case.py
new file mode 100644
index 00000000..2df20d76
--- /dev/null
+++ b/unittests/unittests_core/pipes/version_pipe_test_case.py
@@ -0,0 +1,16 @@
+import unittest
+
+from cpl_core.pipes.version_pipe import VersionPipe
+
+
+class VersionPipeTestCase(unittest.TestCase):
+    def setUp(self):
+        pass
+
+    def test_transform(self):
+        pipe = VersionPipe()
+
+        self.assertEqual("1.1.1", pipe.transform({"Major": 1, "Minor": 1, "Micro": 1}))
+        self.assertEqual("0.1.1", pipe.transform({"Major": 0, "Minor": 1, "Micro": 1}))
+        self.assertEqual("0.0.1", pipe.transform({"Major": 0, "Minor": 0, "Micro": 1}))
+        self.assertEqual("0.0.0", pipe.transform({"Major": 0, "Minor": 0, "Micro": 0}))