def testLayerOrder(self):
""" test project layer order"""
prj = QgsProject()
layer = QgsVectorLayer("Point?field=fldtxt:string", "layer1", "memory")
layer2 = QgsVectorLayer("Point?field=fldtxt:string", "layer2",
"memory")
layer3 = QgsVectorLayer("Point?field=fldtxt:string", "layer3",
"memory")
prj.addMapLayers([layer, layer2, layer3])
layer_order_changed_spy = QSignalSpy(prj.layerOrderChanged)
prj.setLayerOrder([layer2, layer])
self.assertEqual(len(layer_order_changed_spy), 1)
prj.setLayerOrder([layer2, layer])
self.assertEqual(len(layer_order_changed_spy),
1) # no signal, order not changed
self.assertEqual(prj.layerOrder(), [layer2, layer])
prj.setLayerOrder([layer])
self.assertEqual(prj.layerOrder(), [layer])
self.assertEqual(len(layer_order_changed_spy), 2)
# remove a layer
prj.setLayerOrder([layer2, layer, layer3])
self.assertEqual(len(layer_order_changed_spy), 3)
prj.removeMapLayer(layer)
self.assertEqual(prj.layerOrder(), [layer2, layer3])
self.assertEqual(len(layer_order_changed_spy),
3) # should be no signal
# save and restore
file_name = os.path.join(str(QDir.tempPath()), 'proj.qgs')
prj.setFileName(file_name)
prj.write()
prj2 = QgsProject()
prj2.setFileName(file_name)
prj2.read()
self.assertEqual([l.id() for l in prj2.layerOrder()],
[layer2.id(), layer3.id()])
# clear project
prj.clear()
self.assertEqual(prj.layerOrder(), [])
