'Verify get() method to read shared context dict'

def testSharedGet(self):

    assertEqual = self.assertEqual
    context = S3DashboardContext()
    context.shared['test'] = 'XYZ'
    assertEqual(context.get('test'), 'XYZ')
    assertEqual(context.get('nonexistent'), None)
    default = (lambda : None)
    self.assertTrue((context.get('nonexistent', default) is default))
