def testRenderFillLayerDataDefined(self):
""" test that rendering a fill symbol with data defined enabled layer works"""
polys_shp = os.path.join(TEST_DATA_DIR, 'polys.shp')
polys_layer = QgsVectorLayer(polys_shp, 'Polygons', 'ogr')
QgsProject.instance().addMapLayer(polys_layer)
layer = QgsSimpleFillSymbolLayer()
layer.setDataDefinedProperty(QgsSymbolLayer.PropertyLayerEnabled,
QgsProperty.fromExpression("Name='Lake'"))
layer.setStrokeStyle(Qt.NoPen)
layer.setColor(QColor(100, 150, 150))
symbol = QgsFillSymbol()
symbol.changeSymbolLayer(0, layer)
polys_layer.setRenderer(QgsSingleSymbolRenderer(symbol))
ms = QgsMapSettings()
ms.setOutputSize(QSize(400, 400))
ms.setOutputDpi(96)
ms.setExtent(QgsRectangle(-133, 22, -70, 52))
ms.setLayers([polys_layer])
# Test usedAttributes
ctx = QgsRenderContext.fromMapSettings(ms)
ctx.expressionContext().appendScope(
polys_layer.createExpressionContextScope())
# for symbol layer
self.assertCountEqual(layer.usedAttributes(ctx), {'Name'})
# for symbol
self.assertCountEqual(symbol.usedAttributes(ctx), {'Name'})
# for symbol renderer
self.assertCountEqual(polys_layer.renderer().usedAttributes(ctx),
{'Name'})
# Test rendering
renderchecker = QgsMultiRenderChecker()
renderchecker.setMapSettings(ms)
renderchecker.setControlPathPrefix('symbol_layer')
renderchecker.setControlName('expected_filllayer_ddenabled')
self.assertTrue(renderchecker.runTest('filllayer_ddenabled'))
QgsProject.instance().removeMapLayer(polys_layer)
