Add mainwindow tests

Author: ales-erjavec

Orange/canvas/tests/__init__.py

@@ -0,0 +1,12 @@
+from unittest.mock import patch
+
+from Orange.canvas.mainwindow import MainWindow, OUserSettingsDialog
+from orangewidget.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()

Orange/canvas/tests/test_mainwindow.py

@@ -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