Add ResourceLoader unit tests

This first test will simulate a request failure on every resource
directly or indirectly loaded by the ResourceLoader. The idea is
to verify whenever we are failing gracefully or not.

2 files changed, 155 insertions, 0 deletions

diff --git a/test/resources/resource_loader.cpp b/test/resources/resource_loader.cpp
new file mode 100644
index 0000000000..4203755f8a
--- /dev/null
+++ b/test/resources/resource_loader.cpp
@@ -0,0 +1,154 @@
+#include "../fixtures/util.hpp"
+#include "mock_file_source.hpp"
+#include "mock_view.hpp"
+
+#include <mbgl/geometry/glyph_atlas.hpp>
+#include <mbgl/geometry/sprite_atlas.hpp>
+#include <mbgl/map/environment.hpp>
+#include <mbgl/map/map_data.hpp>
+#include <mbgl/map/resource_loader.hpp>
+#include <mbgl/map/transform_state.hpp>
+#include <mbgl/style/style.hpp>
+#include <mbgl/text/glyph_store.hpp>
+#include <mbgl/util/exception.hpp>
+#include <mbgl/util/io.hpp>
+#include <mbgl/util/run_loop.hpp>
+#include <mbgl/util/texture_pool.hpp>
+#include <mbgl/util/thread.hpp>
+
+using namespace mbgl;
+
+namespace {
+
+class MockMapContext : public ResourceLoader::Observer {
+public:
+    MockMapContext(uv_loop_t* loop,
+                   View& view,
+                   FileSource& fileSource,
+                   const std::function<void(std::exception_ptr error)>& callback)
+        : env_(fileSource),
+          envScope_(env_, ThreadType::Map, "Map"),
+          data_(view, MapMode::Still),
+          glyphStore_(util::make_unique<GlyphStore>(loop, env_)),
+          glyphAtlas_(util::make_unique<GlyphAtlas>(1024, 1024)),
+          spriteAtlas_(util::make_unique<SpriteAtlas>(512, 512)),
+          texturePool_(util::make_unique<TexturePool>()),
+          style_(util::make_unique<Style>()),
+          resourceLoader_(util::make_unique<ResourceLoader>()),
+          asyncUpdate(util::make_unique<uv::async>(loop, [this] { update(); })),
+          callback_(callback) {
+        asyncUpdate->unref();
+
+        data_.transform.resize(1000, 1000, 1.0, 1000, 1000);
+        data_.transform.setLatLngZoom({0, 0}, 16);
+
+        const std::string style = util::read_file("test/fixtures/resources/style.json");
+        style_->loadJSON(reinterpret_cast<const uint8_t *>(style.c_str()));
+
+        glyphStore_->setURL(style_->glyph_url);
+
+        resourceLoader_->setGlyphStore(glyphStore_.get());
+        resourceLoader_->setObserver(this);
+        resourceLoader_->setStyle(style_.get());
+    }
+
+    ~MockMapContext() {
+        resourceLoader_.reset();
+        style_.reset();
+        texturePool_.reset();
+        spriteAtlas_.reset();
+        glyphAtlas_.reset();
+        glyphStore_.reset();
+
+        env_.performCleanup();
+    }
+
+    void update() {
+        const auto now = Clock::now();
+
+        data_.setAnimationTime(now);
+        data_.transform.updateTransitions(now);
+
+        transformState_ = data_.transform.currentState();
+
+        resourceLoader_->update(
+            data_, transformState_, *glyphAtlas_, *spriteAtlas_, *texturePool_);
+    }
+
+    // ResourceLoader::Observer implementation.
+    void onTileDataChanged() override {
+        util::ptr<Sprite> sprite = resourceLoader_->getSprite();
+        if (sprite && sprite->isLoaded() && style_->isLoaded()) {
+            callback_(nullptr);
+        }
+
+        asyncUpdate->send();
+    };
+
+    void onResourceLoadingFailed(std::exception_ptr error) override {
+        callback_(error);
+    }
+
+private:
+    Environment env_;
+    EnvironmentScope envScope_;
+
+    MapData data_;
+    TransformState transformState_;
+
+    std::unique_ptr<GlyphStore> glyphStore_;
+    std::unique_ptr<GlyphAtlas> glyphAtlas_;
+    std::unique_ptr<SpriteAtlas> spriteAtlas_;
+    std::unique_ptr<TexturePool> texturePool_;
+    std::unique_ptr<Style> style_;
+    std::unique_ptr<ResourceLoader> resourceLoader_;
+
+    std::unique_ptr<uv::async> asyncUpdate;
+
+    std::function<void(std::exception_ptr error)> callback_;
+};
+
+}
+
+class ResourceLoaderTest : public ::testing::TestWithParam<std::string> {
+};
+
+TEST_P(ResourceLoaderTest, RequestFailure) {
+    util::RunLoop loop(uv_default_loop());
+
+    const std::string param(GetParam());
+
+    MockView view;
+    MockFileSource fileSource(param);
+
+    auto callback = [&loop, &param](std::exception_ptr error) {
+        try {
+            if (error) {
+                std::rethrow_exception(error);
+            } else {
+                // Control test, should succeed.
+                EXPECT_TRUE(param.empty());
+            }
+        } catch (const util::GlyphRangeLoadingException&) {
+            EXPECT_EQ(param, "glyphs.pbf");
+        } catch (const util::SourceLoadingException&) {
+            EXPECT_EQ(param, "source.json");
+        } catch (const util::SpriteLoadingException&) {
+            EXPECT_TRUE(param == "sprite.png" || param == "sprite.json");
+        } catch (const util::TileLoadingException&) {
+            EXPECT_EQ(param, "vector.pbf");
+        } catch (const std::exception&) {
+            EXPECT_TRUE(false) << "Unhandled exception.";
+        }
+
+        loop.stop();
+    };
+
+    util::Thread<MockMapContext> context(
+        "Map", util::ThreadPriority::Regular, view, fileSource, callback);
+
+    uv_run(loop.get(), UV_RUN_DEFAULT);
+}
+
+INSTANTIATE_TEST_CASE_P(ResourceLoader, ResourceLoaderTest,
+    ::testing::Values("", "source.json", "sprite.json", "sprite.png", "vector.pbf", "glyphs.pbf"));
diff --git a/test/test.gypi b/test/test.gypi
index 4a733b4570..8d0a44ab02 100644
--- a/test/test.gypi
+++ b/test/test.gypi
@@ -62,6 +62,7 @@
         'resources/mock_file_source.cpp',
         'resources/mock_file_source.hpp',
         'resources/mock_view.hpp',
+        'resources/resource_loader.cpp',
 
         'storage/storage.hpp',
         'storage/storage.cpp',