Add unittest for mustHaveApp checks

unittests/test_mustHaveApp.py

@@ -0,0 +1,29 @@
+import unittest
+import wx
+
+
+#---------------------------------------------------------------------------
+
+class TestMustHaveApp(unittest.TestCase):
+
+    def test_mustHaveApp0(self):
+        """Test that an exception is raised if there is no app"""
+        with self.assertRaises(wx.PyNoAppError):
+            frame = wx.Frame(None)
+            frame.Close()
+
+
+    def test_mustHaveApp1(self):
+        """Create App and then create a frame"""
+        app = wx.App()
+        frame = wx.Frame(None)
+        frame.Show()
+        frame.Close()
+        app.MainLoop()
+
+
+#---------------------------------------------------------------------------
+
+
+if __name__ == '__main__':
+    unittest.main()