def test_layer_resolving(self):
provider = QgsRasterDemTerrainProvider()
# add raster layer to a project
p = QgsProject()
rl = QgsRasterLayer(os.path.join(unitTestDataPath(), 'float1-16.tif'),
'rl')
self.assertTrue(rl.isValid())
p.addMapLayer(rl)
provider.setLayer(rl)
p.elevationProperties().setTerrainProvider(provider)
tmp_dir = QTemporaryDir()
tmp_project_file = "{}/project.qgs".format(tmp_dir.path())
self.assertTrue(p.write(tmp_project_file))
project2 = QgsProject()
self.assertTrue(project2.read(tmp_project_file))
self.assertIsInstance(project2.elevationProperties().terrainProvider(),
QgsRasterDemTerrainProvider)
# make sure layer is resolved
self.assertEqual(
project2.elevationProperties().terrainProvider().layer().id(),
rl.id())
