diff --git a/plugins/DigitalLibrary/src/DigitalFactoryFileModel.py b/plugins/DigitalLibrary/src/DigitalFactoryFileModel.py
index 718bd11cd2..535cce0e8f 100644
--- a/plugins/DigitalLibrary/src/DigitalFactoryFileModel.py
+++ b/plugins/DigitalLibrary/src/DigitalFactoryFileModel.py
@@ -40,6 +40,7 @@ class DigitalFactoryFileModel(ListModel):
     def setFiles(self, df_files_in_project: List[DigitalFactoryFileResponse]) -> None:
         if self._files == df_files_in_project:
             return
+        self.clear()
         self._files = df_files_in_project
         self._update()
 
diff --git a/plugins/DigitalLibrary/tests/TestDigitalFactoryFileModel.py b/plugins/DigitalLibrary/tests/TestDigitalFactoryFileModel.py
new file mode 100644
index 0000000000..c34dbffc90
--- /dev/null
+++ b/plugins/DigitalLibrary/tests/TestDigitalFactoryFileModel.py
@@ -0,0 +1,73 @@
+from pathlib import Path
+
+from src.DigitalFactoryFileModel import DigitalFactoryFileModel
+from src.DigitalFactoryFileResponse import DigitalFactoryFileResponse
+
+
+file_1 = DigitalFactoryFileResponse(client_id ="client_id_1",
+                                    content_type = "zomg",
+                                    file_name = "file_1.3mf",
+                                    file_id = "file_id_1",
+                                    library_project_id = "project_id_1",
+                                    status = "test",
+                                    user_id = "user_id_1",
+                                    username = "username_1",
+                                    uploaded_at = "2021-04-07T10:33:25.000Z")
+
+file_2 = DigitalFactoryFileResponse(client_id ="client_id_2",
+                                    content_type = "zomg",
+                                    file_name = "file_2.3mf",
+                                    file_id = "file_id_2",
+                                    library_project_id = "project_id_2",
+                                    status = "test",
+                                    user_id = "user_id_2",
+                                    username = "username_2",
+                                    uploaded_at = "2021-02-06T09:33:22.000Z")
+
+file_3 = DigitalFactoryFileResponse(client_id ="client_id_1",
+                                    content_type = "zomg",
+                                    file_name = "file_3.wtf",
+                                    file_id = "file_id_3",
+                                    library_project_id = "project_id_1",
+                                    status = "test",
+                                    user_id = "user_id_1",
+                                    username = "username_1",
+                                    uploaded_at = "2021-04-06T12:33:25.000Z")
+
+
+def test_setFiles():
+    model = DigitalFactoryFileModel()
+
+    assert model.count == 0
+
+    model.setFiles([file_1, file_2])
+    assert model.count == 2
+
+    assert model.getItem(0)["fileName"] == "file_1.3mf"
+    assert model.getItem(1)["fileName"] == "file_2.3mf"
+
+
+def test_clearProjects():
+    model = DigitalFactoryFileModel()
+    model.setFiles([file_1, file_2])
+    model.clearFiles()
+    assert model.count == 0
+
+
+def test_setProjectMultipleTimes():
+    model = DigitalFactoryFileModel()
+    model.setFiles([file_1, file_2])
+    model.setFiles([file_2])
+    assert model.count == 1
+    assert model.getItem(0)["fileName"] == "file_2.3mf"
+
+
+def test_setFilter():
+    model = DigitalFactoryFileModel()
+
+    model.setFiles([file_1, file_2, file_3])
+    model.setFilters({"file_name": lambda x: Path(x).suffix[1:].lower() in ["3mf"]})
+    assert model.count == 2
+
+    model.clearFilters()
+    assert model.count == 3