[core] Restore support for *-transition properties

1 files changed, 46 insertions, 0 deletions

diff --git a/test/style/conversion/layer.test.cpp b/test/style/conversion/layer.test.cpp
new file mode 100644
index 0000000000..b27c1841ee
--- /dev/null
+++ b/test/style/conversion/layer.test.cpp
@@ -0,0 +1,46 @@
+#include <mbgl/test/util.hpp>
+
+#include <mbgl/style/conversion.hpp>
+#include <mbgl/style/rapidjson_conversion.hpp>
+#include <mbgl/style/conversion/layer.hpp>
+#include <mbgl/style/layers/background_layer_impl.hpp>
+#include <mbgl/util/rapidjson.hpp>
+
+using namespace mbgl;
+using namespace mbgl::style;
+using namespace mbgl::style::conversion;
+using namespace std::literals::chrono_literals;
+
+auto parseLayer(const std::string& src) {
+    JSDocument doc;
+    doc.Parse<0>(src);
+    return convert<std::unique_ptr<Layer>, JSValue>(doc);
+}
+
+TEST(StyleConversion, LayerTransition) {
+    auto layer = parseLayer(R"JSON({
+        "type": "background",
+        "id": "background",
+        "paint": {
+            "background-color-transition": {
+                "duration": 400,
+                "delay": 500
+            }
+        },
+        "paint.class": {
+            "background-color-transition": {
+                "duration": 100
+            }
+        }
+    })JSON");
+
+    ASSERT_EQ(400ms, *(*layer)->as<BackgroundLayer>()->impl->paint.cascading
+        .get<BackgroundColor>().getTransition({}).duration);
+    ASSERT_EQ(500ms, *(*layer)->as<BackgroundLayer>()->impl->paint.cascading
+        .get<BackgroundColor>().getTransition({}).delay);
+
+    ASSERT_EQ(100ms, *(*layer)->as<BackgroundLayer>()->impl->paint.cascading
+        .get<BackgroundColor>().getTransition({"class"}).duration);
+    ASSERT_FALSE(bool((*layer)->as<BackgroundLayer>()->impl->paint.cascading
+        .get<BackgroundColor>().getTransition({"class"}).delay));
+}