[repro] View Props 2.0 payload: removing shadowColor sends 0

Author: bartlomiejbloniarz

packages/react-native/ReactCommon/react/renderer/components/view/tests/ViewPropsDiffTest.cpp

@@ -22,6 +22,7 @@ void expectPayloads(const std::vector<PropsCommit>& commits) {
   expectPayloadsMatchRawProps<ViewProps>(commits);
 }
 
+const auto kRed = static_cast<int32_t>(0xFFFF0000);
 
 } // namespace
 
@@ -75,6 +76,15 @@ TEST(ViewPropsDiffTest, dropShadowWithoutColorOmitsColor) {
               "standardDeviation", 4))))}});
 }
 
+// BaseViewManager.setShadowColor resets to black for null; 0 makes the
+// elevation shadow transparent.
+TEST(ViewPropsDiffTest, removingShadowColorEmitsNull) {
+  expectPayloads({
+      {dynamic::object("elevation", 8)("shadowColor", kRed)},
+      {dynamic::object("shadowColor", nullptr)},
+  });
+}
+
 } // namespace facebook::react
 
 #endif