1 files changed, 54 insertions, 0 deletions
diff --git a/test/renderer/group_by_layout.test.cpp b/test/renderer/group_by_layout.test.cpp
new file mode 100644
index 0000000000..9c8e09e222
--- /dev/null
+++ b/test/renderer/group_by_layout.test.cpp
@@ -0,0 +1,54 @@
+#include <mbgl/test/util.hpp>
+
+#include <mbgl/renderer/group_by_layout.hpp>
+#include <mbgl/renderer/render_layer.hpp>
+#include <mbgl/style/layers/background_layer.hpp>
+#include <mbgl/style/layers/circle_layer.hpp>
+#include <mbgl/style/layers/line_layer.hpp>
+
+using namespace mbgl;
+using namespace mbgl::style;
+
+static std::vector<std::unique_ptr<RenderLayer>> toRenderLayers(const std::vector<std::unique_ptr<Layer>>& layers) {
+    std::vector<std::unique_ptr<RenderLayer>> result;
+    result.reserve(layers.size());
+    for (auto& layer : layers) {
+        result.push_back(layer->baseImpl->createRenderLayer());
+    }
+    return result;
+}
+
+TEST(GroupByLayout, Related) {
+    std::vector<std::unique_ptr<Layer>> layers;
+    layers.push_back(std::make_unique<LineLayer>("a", "source"));
+    layers.push_back(std::make_unique<LineLayer>("b", "source"));
+    auto result = groupByLayout(toRenderLayers(layers));
+    ASSERT_EQ(1u, result.size());
+    ASSERT_EQ(2u, result[0].size());
+}
+
+TEST(GroupByLayout, UnrelatedType) {
+    std::vector<std::unique_ptr<Layer>> layers;
+    layers.push_back(std::make_unique<BackgroundLayer>("background"));
+    layers.push_back(std::make_unique<CircleLayer>("circle", "source"));
+    auto result = groupByLayout(toRenderLayers(layers));
+    ASSERT_EQ(2u, result.size());
+}
+
+TEST(GroupByLayout, UnrelatedFilter) {
+    std::vector<std::unique_ptr<Layer>> layers;
+    layers.push_back(std::make_unique<LineLayer>("a", "source"));
+    layers.push_back(std::make_unique<LineLayer>("b", "source"));
+    layers[0]->as<LineLayer>()->setFilter(EqualsFilter());
+    auto result = groupByLayout(toRenderLayers(layers));
+    ASSERT_EQ(2u, result.size());
+}
+
+TEST(GroupByLayout, UnrelatedLayout) {
+    std::vector<std::unique_ptr<Layer>> layers;
+    layers.push_back(std::make_unique<LineLayer>("a", "source"));
+    layers.push_back(std::make_unique<LineLayer>("b", "source"));
+    layers[0]->as<LineLayer>()->setLineCap(LineCapType::Square);
+    auto result = groupByLayout(toRenderLayers(layers));
+    ASSERT_EQ(2u, result.size());
+}