diff --git a/Orange/canvas/utils/tests/test_overlay.py b/Orange/canvas/utils/tests/test_overlay.py
new file mode 100644
index 00000000000..962806777c9
--- /dev/null
+++ b/Orange/canvas/utils/tests/test_overlay.py
@@ -0,0 +1,94 @@
+import unittest.mock
+
+from AnyQt.QtCore import Qt, QEvent
+from AnyQt.QtTest import QTest
+from AnyQt.QtWidgets import QWidget, QApplication
+
+from Orange.canvas.utils.overlay import NotificationWidget, NotificationOverlay
+from Orange.widgets.tests.base import GuiTest
+
+
+class TestOverlay(GuiTest):
+    def setUp(self) -> None:
+        self.container = QWidget()
+        stdb = NotificationWidget.Ok | NotificationWidget.Close
+        self.overlay = NotificationOverlay(self.container)
+        self.notif = NotificationWidget(title="lol",
+                                        text="hihi",
+                                        standardButtons=stdb)
+        self.container.show()
+        QTest.qWaitForWindowExposed(self.container)
+        self.overlay.show()
+        QTest.qWaitForWindowExposed(self.overlay)
+
+    def tearDown(self) -> None:
+        NotificationOverlay.overlayInstances = []
+        NotificationOverlay.notifQueue = []
+        self.container = None
+        self.overlay = None
+        self.notif = None
+
+    def test_notification_dismiss(self):
+        mock = unittest.mock.MagicMock()
+        self.notif.clicked.connect(mock)
+        NotificationOverlay.registerNotification(self.notif)
+        QTest.mouseClick(self.notif._dismiss_button, Qt.LeftButton)
+        mock.assert_called_once_with(self.notif._dismiss_button)
+
+    def test_notification_message(self):
+        self.notif.setText("Hello world! It's so nice here")
+        QApplication.sendPostedEvents(self.notif, QEvent.LayoutRequest)
+        self.assertTrue(self.notif.geometry().isValid())
+
+        button_ok = self.notif.button(NotificationWidget.Ok)
+        button_close = self.notif.button(NotificationWidget.Close)
+
+        self.assertTrue(all([button_ok, button_close]))
+        self.assertIs(self.notif.button(NotificationWidget.Ok), button_ok)
+        self.assertIs(self.notif.button(NotificationWidget.Close), button_close)
+
+        button = self.notif.button(NotificationWidget.Ok)
+        self.assertIsNot(button, None)
+        self.assertTrue(self.notif.buttonRole(button),
+                        NotificationWidget.AcceptRole)
+
+        mock = unittest.mock.MagicMock()
+        self.notif.accepted.connect(mock)
+
+        NotificationOverlay.registerNotification(self.notif)
+
+        cloned = NotificationOverlay.overlayInstances[0].currentWidget()
+        self.assertTrue(cloned.isVisible())
+        button = cloned._msgwidget.button(NotificationWidget.Ok)
+        QTest.mouseClick(button, Qt.LeftButton)
+        self.assertFalse(cloned.isVisible())
+
+        mock.assert_called_once()
+
+    def test_queued_notifications(self):
+        surveyDialogButtons = NotificationWidget.Ok | NotificationWidget.Close
+        surveyDialog = NotificationWidget(title="Survey",
+                                          text="We want to understand our users better.\n"
+                                               "Would you like to take a short survey?",
+                                          standardButtons=surveyDialogButtons)
+
+        def handle_survey_response(button):
+            pass
+
+        surveyDialog.clicked.connect(handle_survey_response)
+
+        NotificationOverlay.registerNotification(self.notif)
+        notif1 = NotificationOverlay.overlayInstances[0]._widgets[0]
+        button = notif1._dismiss_button
+
+        NotificationOverlay.registerNotification(surveyDialog)
+        notif2 = NotificationOverlay.overlayInstances[0]._widgets[1]
+
+        self.assertTrue(notif1.isVisible())
+        self.assertFalse(notif2.isVisible())
+
+        QTest.mouseClick(button, Qt.LeftButton)
+
+        self.assertFalse(notif1.isVisible())
+        self.assertTrue(notif2.isVisible())
+