def testOverviewExpressionContextStacking(self):
atlas_layer = QgsVectorLayer("Point?crs=epsg:4326&field=attr:int(1)&field=label:string(20)", "points", "memory")
atlas_feature1 = QgsFeature(atlas_layer.fields())
atlas_feature1.setAttributes([5, 'a'])
atlas_feature1.setGeometry(QgsGeometry.fromPointXY(QgsPointXY(55, 55)))
atlas_layer.dataProvider().addFeature(atlas_feature1)
atlas_feature2 = QgsFeature(atlas_layer.fields())
atlas_feature2.setAttributes([15, 'b'])
atlas_feature2.setGeometry(QgsGeometry.fromPointXY(QgsPointXY(55, 55)))
atlas_layer.dataProvider().addFeature(atlas_feature2)
l = QgsLayout(QgsProject.instance())
l.initializeDefaults()
map = QgsLayoutItemMap(l)
map.attemptSetSceneRect(QRectF(20, 20, 200, 100))
map.setFrameEnabled(True)
map.setLayers([atlas_layer])
l.addLayoutItem(map)
overviewMap = QgsLayoutItemMap(l)
overviewMap.attemptSetSceneRect(QRectF(20, 130, 70, 70))
l.addLayoutItem(overviewMap)
overviewMap.setFrameEnabled(True)
overviewMap.setLayers([atlas_layer])
# zoom in
myRectangle = QgsRectangle(96, -152, 160, -120)
map.setExtent(myRectangle)
myRectangle2 = QgsRectangle(-20, -276, 276, 20)
overviewMap.setExtent(myRectangle2)
overviewMap.overview().setLinkedMap(map)
overviewMap.overview().setStackingPosition(QgsLayoutItemMapItem.StackAboveMapLayer)
overviewMap.overview().setStackingLayer(atlas_layer)
fill_symbol = QgsFillSymbol.createSimple({'color': '#0000ff', 'outline_style': 'no'})
fill_symbol[0].setDataDefinedProperty(QgsSymbolLayer.PropertyFillColor, QgsProperty.fromExpression('case when label=\'a\' then \'red\' else \'green\' end'))
overviewMap.overview().setFrameSymbol(fill_symbol)
l.reportContext().setLayer(atlas_layer)
l.reportContext().setFeature(atlas_feature1)
checker = QgsLayoutChecker('composermap_overview_atlas_1', l)
checker.setColorTolerance(6)
checker.setControlPathPrefix("composer_mapoverview")
myTestResult, myMessage = checker.testLayout()
self.report += checker.report()
self.assertTrue(myTestResult, myMessage)
l.reportContext().setFeature(atlas_feature2)
checker = QgsLayoutChecker('composermap_overview_atlas_2', l)
checker.setColorTolerance(6)
checker.setControlPathPrefix("composer_mapoverview")
myTestResult, myMessage = checker.testLayout()
self.report += checker.report()
self.assertTrue(myTestResult, myMessage)
