1 files changed, 93 insertions, 0 deletions
diff --git a/test/tile/raster_dem_tile.test.cpp b/test/tile/raster_dem_tile.test.cpp
new file mode 100644
index 0000000000..c6f9b80b42
--- /dev/null
+++ b/test/tile/raster_dem_tile.test.cpp
@@ -0,0 +1,93 @@
+#include <mbgl/test/util.hpp>
+#include <mbgl/test/fake_file_source.hpp>
+#include <mbgl/tile/raster_dem_tile.hpp>
+#include <mbgl/tile/tile_loader_impl.hpp>
+
+#include <mbgl/style/style.hpp>
+#include <mbgl/util/default_thread_pool.hpp>
+#include <mbgl/util/run_loop.hpp>
+#include <mbgl/map/transform.hpp>
+#include <mbgl/annotation/annotation_manager.hpp>
+#include <mbgl/renderer/tile_parameters.hpp>
+#include <mbgl/renderer/buckets/hillshade_bucket.hpp>
+#include <mbgl/renderer/image_manager.hpp>
+#include <mbgl/text/glyph_manager.hpp>
+
+using namespace mbgl;
+
+class RasterDEMTileTest {
+public:
+    FakeFileSource fileSource;
+    TransformState transformState;
+    util::RunLoop loop;
+    ThreadPool threadPool { 1 };
+    style::Style style { loop, fileSource, 1 };
+    AnnotationManager annotationManager { style };
+    ImageManager imageManager;
+    GlyphManager glyphManager { fileSource };
+    Tileset tileset { { "https://example.com" }, { 0, 22 }, "none" };
+
+    TileParameters tileParameters {
+        1.0,
+        MapDebugOptions(),
+        transformState,
+        threadPool,
+        fileSource,
+        MapMode::Continuous,
+        annotationManager,
+        imageManager,
+        glyphManager,
+        0
+    };
+};
+
+TEST(RasterDEMTile, setError) {
+    RasterDEMTileTest test;
+    RasterDEMTile tile(OverscaledTileID(0, 0, 0), test.tileParameters, test.tileset);
+    tile.setError(std::make_exception_ptr(std::runtime_error("test")));
+    EXPECT_FALSE(tile.isRenderable());
+    EXPECT_TRUE(tile.isLoaded());
+    EXPECT_TRUE(tile.isComplete());
+}
+
+TEST(RasterDEMTile, onError) {
+    RasterDEMTileTest test;
+    RasterDEMTile tile(OverscaledTileID(0, 0, 0), test.tileParameters, test.tileset);
+    tile.onError(std::make_exception_ptr(std::runtime_error("test")), 0);
+    EXPECT_FALSE(tile.isRenderable());
+    EXPECT_TRUE(tile.isLoaded());
+    EXPECT_TRUE(tile.isComplete());
+}
+
+TEST(RasterDEMTile, onParsed) {
+    RasterDEMTileTest test;
+    RasterDEMTile tile(OverscaledTileID(0, 0, 0), test.tileParameters, test.tileset);
+    tile.onParsed(std::make_unique<HillshadeBucket>(PremultipliedImage({16, 16})), 0);
+    EXPECT_TRUE(tile.isRenderable());
+    EXPECT_TRUE(tile.isLoaded());
+    EXPECT_TRUE(tile.isComplete());
+
+    // Make sure that once we've had a renderable tile and then receive erroneous data, we retain
+    // the previously rendered data and keep the tile renderable.
+    tile.setError(std::make_exception_ptr(std::runtime_error("Connection offline")));
+    EXPECT_TRUE(tile.isRenderable());
+    EXPECT_TRUE(tile.isLoaded());
+    EXPECT_TRUE(tile.isComplete());
+
+    // Then simulate a parsing failure and make sure that we keep it renderable in this situation
+    // as well.
+    tile.onError(std::make_exception_ptr(std::runtime_error("Parse error")), 0);
+    ASSERT_TRUE(tile.isRenderable());
+    EXPECT_TRUE(tile.isLoaded());
+    EXPECT_TRUE(tile.isComplete());
+}
+
+TEST(RasterDEMTile, onParsedEmpty) {
+    RasterDEMTileTest test;
+    RasterDEMTile tile(OverscaledTileID(0, 0, 0), test.tileParameters, test.tileset);
+    tile.onParsed(nullptr, 0);
+    EXPECT_FALSE(tile.isRenderable());
+    EXPECT_TRUE(tile.isLoaded());
+    EXPECT_TRUE(tile.isComplete());
+}
+