[repro] View Props 2.0 payload: a gradient color hint is sent as a transparent stop

Author: bartlomiejbloniarz

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

@@ -85,6 +85,21 @@ TEST(ViewPropsDiffTest, removingShadowColorEmitsNull) {
   });
 }
 
+// The Android gradients treat a stop with a null color as a transition hint;
+// 0 is a transparent stop.
+TEST(ViewPropsDiffTest, gradientColorHintEmitsNullColor) {
+  expectPayloads({{dynamic::object(
+      "backgroundImage",
+      dynamic::array(dynamic::object("type", "linear-gradient")(
+          "direction", dynamic::object("type", "angle")("value", 180))(
+          "colorStops",
+          dynamic::array(
+              dynamic::object("color", kRed)("position", nullptr),
+              dynamic::object("color", nullptr)("position", "20%"),
+              dynamic::object("color", static_cast<int32_t>(0xFF0000FF))(
+                  "position", nullptr)))))}});
+}
+
 } // namespace facebook::react
 
 #endif