diff --git a/plugins/UM3NetworkPrinting/tests/Cloud/NetworkManagerMock.py b/plugins/UM3NetworkPrinting/tests/Cloud/NetworkManagerMock.py
index 945c526814..25107971c0 100644
--- a/plugins/UM3NetworkPrinting/tests/Cloud/NetworkManagerMock.py
+++ b/plugins/UM3NetworkPrinting/tests/Cloud/NetworkManagerMock.py
@@ -9,10 +9,15 @@ from PyQt5.QtNetwork import QNetworkAccessManager, QNetworkReply
 from UM.Signal import Signal
 
 
+## This class can be used to mock the QNetworkManager class and test the code using it.
+#  After patching the QNetworkManager class, requests are prepared before they can be executed.
+#  Any requests not prepared beforehand will cause KeyErrors.
 class NetworkManagerMock:
+    # signals used in the network manager.
     finished = Signal()
     authenticationRequired = Signal()
 
+    # an enumeration of the supported operations and their code for the network access manager.
     _OPERATIONS = {
         "GET": QNetworkAccessManager.GetOperation,
         "POST": QNetworkAccessManager.PostOperation,
@@ -22,15 +27,29 @@ class NetworkManagerMock:
     }
 
     def __init__(self):
+        # a dict with the prepared replies, using the format {(http_method, url): reply}
         self.replies = {}  # type: Dict[Tuple[str, str], QNetworkReply]
 
-    def __getattr__(self, method):
+    ## Mock implementation  of the get, post, put, delete and head methods from the network manager.
+    #  Since the methods are very simple and the same it didn't make sense to repeat the code.
+    #  \param method: The method being called.
+    #  \return The mocked function, if the method name is known. Defaults to the standard getattr function.
+    def __getattr__(self, method: str):
         operation = self._OPERATIONS.get(method.upper())
         if operation:
+            # this mock implementation will simply return the reply from the prepared ones.
+            # it raises a KeyError if requests are done without being prepared.
             return lambda request, *_: self.replies[method.upper(), request.url().toString()]
-        return super().__getattribute__(method)
 
-    def prepareResponse(self, method: str, url: str, status_code: int, response: dict) -> None:
+        # the attribute is not one of the implemented methods, default to the standard implementation.
+        return getattr(super(), method)
+
+    ## Prepares a server reply for the given parameters.
+    #  \param method: The HTTP method.
+    #  \param url: The URL being requested.
+    #  \param status_code: The HTTP status code for the response.
+    #  \param response: A dictionary with the response from the server (this is converted to JSON).
+    def prepareReply(self, method: str, url: str, status_code: int, response: dict) -> None:
         reply_mock = MagicMock()
         reply_mock.url().toString.return_value = url
         reply_mock.operation.return_value = self._OPERATIONS[method]
@@ -38,9 +57,30 @@ class NetworkManagerMock:
         reply_mock.readAll.return_value = json.dumps(response).encode()
         self.replies[method, url] = reply_mock
 
+    ## Prepares a reply for the API call to get clusters.
+    def prepareGetClusters(self) -> None:
+        self.prepareReply(
+            "GET", "https://api-staging.ultimaker.com/connect/v1/clusters",
+            200, {
+                "data": [{
+                    "cluster_id": "RIZ6cZbWA_Ua7RZVJhrdVfVpf0z-MqaSHQE4v8aRTtYq",
+                    "host_guid": "e90ae0ac-1257-4403-91ee-a44c9b7e8050",
+                    "host_name": "ultimakersystem-ccbdd30044ec", "host_version": "5.1.2.20180807",
+                    "is_online": False, "status": "inactive"
+                }, {
+                    "cluster_id": "R0YcLJwar1ugh0ikEZsZs8NWKV6vJP_LdYsXgXqAcaNC",
+                    "host_guid": "e90ae0ac-1257-4403-91ee-a44c9b7e8050",
+                    "host_name": "ultimakersystem-ccbdd30044ec", "host_version": "5.1.2.20180807",
+                    "is_online": True, "status": "active"
+                }]
+            }
+        )
+
+    ## Emits the signal that the reply is ready to all prepared replies.
     def flushReplies(self):
         for reply in self.replies.values():
             self.finished.emit(reply)
 
+    ## Deletes all prepared replies
     def reset(self):
         self.replies.clear()
diff --git a/plugins/UM3NetworkPrinting/tests/Cloud/TestCloudOutputDeviceManager.py b/plugins/UM3NetworkPrinting/tests/Cloud/TestCloudOutputDeviceManager.py
index cf86f713b2..b22308ac1e 100644
--- a/plugins/UM3NetworkPrinting/tests/Cloud/TestCloudOutputDeviceManager.py
+++ b/plugins/UM3NetworkPrinting/tests/Cloud/TestCloudOutputDeviceManager.py
@@ -18,22 +18,7 @@ class TestCloudOutputDeviceManager(TestCase):
         self.app.initialize()
 
         self.network = NetworkManagerMock()
-        self.network.prepareResponse(
-            "GET", "https://api-staging.ultimaker.com/connect/v1/clusters",
-            200, {
-                "data": [{
-                    "cluster_id": "RIZ6cZbWA_Ua7RZVJhrdVfVpf0z-MqaSHQE4v8aRTtYq",
-                    "host_guid": "e90ae0ac-1257-4403-91ee-a44c9b7e8050",
-                    "host_name": "ultimakersystem-ccbdd30044ec", "host_version": "5.1.2.20180807",
-                    "is_online": False, "status": "inactive"
-                }, {
-                    "cluster_id": "R0YcLJwar1ugh0ikEZsZs8NWKV6vJP_LdYsXgXqAcaNC",
-                    "host_guid": "e90ae0ac-1257-4403-91ee-a44c9b7e8050",
-                    "host_name": "ultimakersystem-ccbdd30044ec", "host_version": "5.1.2.20180807",
-                    "is_online": True, "status": "active"
-                }]
-            }
-        )
+        self.network.prepareGetClusters()
 
     def tearDown(self):
         super().tearDown()
@@ -48,4 +33,6 @@ class TestCloudOutputDeviceManager(TestCase):
         self.network.flushReplies()
 
         devices = self.app.getOutputDeviceManager().getOutputDevices()
-        self.assertEqual([CloudOutputDevice], list(map(type, devices)))
+        self.assertEqual([CloudOutputDevice], [type(d) for d in devices])
+        self.assertEqual(["R0YcLJwar1ugh0ikEZsZs8NWKV6vJP_LdYsXgXqAcaNC"], [d.key for d in devices])
+        self.assertEqual(["ultimakersystem-ccbdd30044ec"], [d.host_name for d in devices])