Asynchronous GeometryTile deletion (#2051)

Co-authored-by: Tim Sylvester <tim@wetdogweather.com>

test/include/mbgl/test/vector_tile_test.hpp

@@ -0,0 +1,49 @@
+#include <mbgl/map/transform.hpp>
+#include <mbgl/renderer/tile_parameters.hpp>
+#include <mbgl/renderer/image_manager.hpp>
+#include <mbgl/style/style.hpp>
+#include <mbgl/test/fake_file_source.hpp>
+#include <mbgl/text/glyph_manager.hpp>
+#include <mbgl/util/run_loop.hpp>
+
+#include <memory>
+
+#include <mbgl/test/util.hpp>
+#include <mbgl/util/logging.hpp>
+#include <mbgl/util/string.hpp>
+
+namespace mbgl {
+
+class VectorTileTest {
+public:
+    std::shared_ptr<FileSource> fileSource = std::make_shared<FakeFileSource>();
+    TransformState transformState;
+    util::RunLoop loop;
+    style::Style style{fileSource, 1};
+    AnnotationManager annotationManager{style};
+
+    const std::shared_ptr<ImageManager> imageManager = std::make_shared<ImageManager>();
+    const std::shared_ptr<GlyphManager> glyphManager = std::make_shared<GlyphManager>();
+
+    Tileset tileset{{"https://example.com"}, {0, 22}, "none"};
+
+    const std::shared_ptr<Scheduler> threadPool = Scheduler::GetBackground();
+
+    TileParameters tileParameters{1.0,
+                                  MapDebugOptions(),
+                                  transformState,
+                                  fileSource,
+                                  MapMode::Continuous,
+                                  annotationManager.makeWeakPtr(),
+                                  imageManager,
+                                  glyphManager,
+                                  0};
+
+    ~VectorTileTest() {
+        // Ensure that deferred releases are complete before cleaning up
+        EXPECT_EQ(0, loop.waitForEmpty(Milliseconds::zero()));
+        EXPECT_EQ(0, threadPool->waitForEmpty());
+    }
+};
+
+} // namespace mbgl