diff --git a/plugins/3MFWriter/ThreeMFWriter.py b/plugins/3MFWriter/ThreeMFWriter.py
index 3be9a7478d..10b040e01f 100644
--- a/plugins/3MFWriter/ThreeMFWriter.py
+++ b/plugins/3MFWriter/ThreeMFWriter.py
@@ -286,7 +286,7 @@ class ThreeMFWriter(MeshWriter):
                     plugin_ids.add(plugin_id)
 
         # Go through all stacks and find all the plugin id contained in the project
-        global_stack = Application.getInstance().getMachineManager().activeMachine
+        global_stack = CuraApplication.getInstance().getMachineManager().activeMachine
         addPluginIdsInStack(global_stack)
 
         for container in global_stack.getContainers():
diff --git a/plugins/3MFWriter/tests/TestMFWriter.py b/plugins/3MFWriter/tests/TestMFWriter.py
new file mode 100644
index 0000000000..addef2788e
--- /dev/null
+++ b/plugins/3MFWriter/tests/TestMFWriter.py
@@ -0,0 +1,56 @@
+import sys
+import os.path
+from typing import Dict, Optional
+
+from unittest.mock import patch, MagicMock, PropertyMock
+
+from UM.PackageManager import PackageManager
+from cura.CuraApplication import CuraApplication
+
+sys.path.append(os.path.join(os.path.dirname(os.path.abspath(__file__)), ".."))
+
+import ThreeMFWriter
+
+PLUGIN_ID = "my_plugin"
+DISPLAY_NAME = "MyPlugin"
+PACKAGE_VERSION = "0.0.1"
+SDK_VERSION = "8.0.0"
+
+
+def package_manager() -> MagicMock:
+    pm = MagicMock(spec=PackageManager)
+    pm.getInstalledPackageInfo.return_value = {
+        "display_name": DISPLAY_NAME,
+        "package_version": PACKAGE_VERSION,
+        "sdk_version_semver": SDK_VERSION
+    }
+    return pm
+
+
+def machine_manager() -> MagicMock:
+    mm = MagicMock(spec=PackageManager)
+    active_machine = MagicMock()
+    active_machine.getAllKeys.return_value = ["infill_pattern", "layer_height", "material_bed_temperature"]
+    active_machine.getProperty.return_value = f"PLUGIN::{PLUGIN_ID}@{PACKAGE_VERSION}::custom_value"
+    active_machine.getContainers.return_value = []
+    active_machine.extruderList = []
+    mm.activeMachine = active_machine
+    return mm
+
+
+def application():
+    app = MagicMock()
+    app.getPackageManager.return_value = package_manager()
+    app.getMachineManager.return_value = machine_manager()
+    return app
+
+
+def test_enumParsing():
+    with patch("cura.CuraApplication.CuraApplication.getInstance", MagicMock(return_value=application())):
+        packages_metadata = ThreeMFWriter.ThreeMFWriter._getPluginPackageMetadata()[0]
+
+        assert packages_metadata.get("id") == PLUGIN_ID
+        assert packages_metadata.get("display_name") == DISPLAY_NAME
+        assert packages_metadata.get("package_version") == PACKAGE_VERSION
+        assert packages_metadata.get("sdk_version_semver") == SDK_VERSION
+        assert packages_metadata.get("type") == "plugin"