Add unit tests

tests/src/python/test_qgsrulebasedrenderer.py

@@ -40,7 +40,8 @@ from qgis.core import (QgsVectorLayer,
                        QgsRendererCategory,
                        QgsCategorizedSymbolRenderer,
                        QgsGraduatedSymbolRenderer,
-                       QgsRendererRange
+                       QgsRendererRange,
+                       QgsRenderContext
                        )
 from qgis.testing import start_app, unittest
 from utilities import unitTestDataPath
@@ -101,6 +102,27 @@ class TestQgsRulebasedRenderer(unittest.TestCase):
 
         assert result
 
+    def testWillRenderFeature(self):
+        vl = self.mapsettings.layers()[0]
+        ft = vl.getFeature(0) # 'id' = 1
+        renderer = vl.renderer()
+
+        ctx = QgsRenderContext.fromMapSettings(self.mapsettings)
+        ctx.expressionContext().setFeature(ft)
+
+        renderer.rootRule().children()[0].setActive(False)
+        renderer.rootRule().children()[1].setActive(True)
+        renderer.rootRule().children()[2].setActive(True)
+
+        renderer.startRender(ctx, vl.fields()) # build mActiveChlidren
+
+        rendered = renderer.willRenderFeature(ft, ctx)
+        renderer.rootRule().children()[0].setActive(True)
+        assert rendered == False
+
+        rendered = renderer.willRenderFeature(ft, ctx)
+        assert rendered == True
+
     def testRefineWithCategories(self):
         # Test refining rule with categories (refs #10815)