[tests] Add tests for Map::[add|remove]Image

Author: tmpsantos

test/fixtures/api/icon_style.json

@@ -0,0 +1,25 @@
+{
+  "version": 8,
+  "sources": {
+    "geojson": {
+      "type": "geojson",
+      "data": {
+        "type": "Point",
+        "coordinates": [
+          0,
+          0
+        ]
+      }
+    }
+  },
+  "layers": [
+    {
+      "id": "symbol",
+      "type": "symbol",
+      "source": "geojson",
+      "layout": {
+        "icon-image": "test-icon"
+      }
+    }
+  ]
+}

test/fixtures/map/add_icon/expected.png

@@ -6,8 +6,10 @@
 #include <mbgl/map/map.hpp>
 #include <mbgl/platform/default/headless_view.hpp>
 #include <mbgl/platform/default/headless_display.hpp>
+#include <mbgl/sprite/sprite_image.hpp>
 #include <mbgl/storage/network_status.hpp>
 #include <mbgl/storage/default_file_source.hpp>
+#include <mbgl/util/image.hpp>
 #include <mbgl/util/io.hpp>
 #include <mbgl/util/run_loop.hpp>
 #include <mbgl/style/layers/background_layer.hpp>
@@ -343,3 +345,34 @@ TEST(Map, Classes) {
     EXPECT_TRUE(map.getClasses().empty());
     EXPECT_FALSE(map.getTransitionOptions().duration);
 }
+
+TEST(Map, AddImage) {
+    MapTest test;
+
+    Map map(test.view, test.fileSource, MapMode::Still);
+    auto decoded1 = decodeImage(util::read_file("test/fixtures/sprites/default_marker.png"));
+    auto decoded2 = decodeImage(util::read_file("test/fixtures/sprites/default_marker.png"));
+    auto image1 = std::make_unique<SpriteImage>(std::move(decoded1), 1.0);
+    auto image2 = std::make_unique<SpriteImage>(std::move(decoded2), 1.0);
+
+    // No-op.
+    map.addImage("test-icon", std::move(image1));
+
+    map.setStyleJSON(util::read_file("test/fixtures/api/icon_style.json"));
+    map.addImage("test-icon", std::move(image2));
+    test::checkImage("test/fixtures/map/add_icon", test::render(map));
+}
+
+TEST(Map, RemoveImage) {
+    MapTest test;
+
+    Map map(test.view, test.fileSource, MapMode::Still);
+    auto decoded = decodeImage(util::read_file("test/fixtures/sprites/default_marker.png"));
+    auto image = std::make_unique<SpriteImage>(std::move(decoded), 1.0);
+
+    map.setStyleJSON(util::read_file("test/fixtures/api/icon_style.json"));
+    map.addImage("test-icon", std::move(image));
+    map.removeImage("test-icon");
+    test::checkImage("test/fixtures/map/remove_icon", test::render(map));
+}
+