diff --git a/Orange/canvas/tests/__init__.py b/Orange/canvas/tests/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/Orange/canvas/tests/test_mainwindow.py b/Orange/canvas/tests/test_mainwindow.py
new file mode 100644
index 00000000000..b1f5f8fe17d
--- /dev/null
+++ b/Orange/canvas/tests/test_mainwindow.py
@@ -0,0 +1,13 @@
+# pylint: disable=all
+from unittest.mock import patch
+
+from Orange.canvas.mainwindow import MainWindow, OUserSettingsDialog
+from Orange.widgets.tests.base import GuiTest
+
+
+class TestMainWindow(GuiTest):
+    def test_settings_dialog(self):
+        mw = MainWindow()
+        with patch.object(OUserSettingsDialog, "exec", lambda self: 0), \
+                patch.object(OUserSettingsDialog, "show", lambda self: None):
+            mw.open_canvas_settings()
diff --git a/requirements-gui.txt b/requirements-gui.txt
index a898fac9290..bfe7c8d15bd 100644
--- a/requirements-gui.txt
+++ b/requirements-gui.txt
@@ -1,4 +1,4 @@
-orange-canvas-core>=0.1.19,<0.2a
+orange-canvas-core>=0.1.21,<0.2a
 orange-widget-base>=4.13.0
 
 PyQt5>=5.12,!=5.15.1  # 5.15.1 skipped because of QTBUG-87057 - affects select columns
diff --git a/tox.ini b/tox.ini
index 358558529c4..ab2e9ec87ee 100644
--- a/tox.ini
+++ b/tox.ini
@@ -45,7 +45,8 @@ commands_pre =
     # freeze environment
     pip freeze
 commands =
-    coverage run {toxinidir}/quietunittest.py Orange.tests Orange.widgets.tests
+    coverage run {toxinidir}/quietunittest.py Orange.tests Orange.widgets.tests Orange.canvas.tests
+    coverage run {toxinidir}/quietunittest.py discover Orange.canvas.tests
     coverage combine
     coverage report