def test_legend_key_to_expression(self):
sym1 = QgsMarkerSymbol.createSimple({
'color': '#fdbf6f',
'outline_color': 'black'
})
sub_renderer = QgsSingleSymbolRenderer(sym1)
renderer = QgsPointDisplacementRenderer()
renderer.setEmbeddedRenderer(sub_renderer)
exp, ok = renderer.legendKeyToExpression('0', None)
self.assertTrue(ok)
self.assertEqual(exp, 'TRUE')
exp, ok = renderer.legendKeyToExpression('xxxx', None)
self.assertFalse(ok)
