From 7f33df4629d6a1b44b9dabd84823ff51db05f85d Mon Sep 17 00:00:00 2001
From: Dane Springmeyer <dane@mapbox.com>
Date: Sat, 31 Aug 2019 08:56:34 -0700
Subject: add testcase for #15514

---
 test/storage/sync_file_source.test.cpp | 47 ++++++++++++++++++++++++++++++++++
 test/test-files.json                   |  1 +
 2 files changed, 48 insertions(+)
 create mode 100644 test/storage/sync_file_source.test.cpp

diff --git a/test/storage/sync_file_source.test.cpp b/test/storage/sync_file_source.test.cpp
new file mode 100644
index 0000000000..5de6bc5187
--- /dev/null
+++ b/test/storage/sync_file_source.test.cpp
@@ -0,0 +1,47 @@
+#include <mbgl/util/run_loop.hpp>
+#include <mbgl/util/io.hpp>
+#include <mbgl/storage/file_source.hpp>
+#include <mbgl/gfx/headless_frontend.hpp>
+#include <mbgl/map/map.hpp>
+#include <mbgl/map/map_impl.hpp>
+#include <mbgl/style/style.hpp>
+#include <mbgl/test/map_adapter.hpp>
+#include <unordered_map>
+
+#include <gtest/gtest.h>
+
+using namespace mbgl;
+
+class SyncFileSource : public FileSource {
+  public:
+
+    std::unique_ptr<AsyncRequest> request(const Resource& resource, FileSource::Callback callback) {
+        Response response;
+        auto it = assets.find(resource.url);
+        if (it == assets.end()) {
+            response.error = std::make_unique<Response::Error>(Response::Error::Reason::NotFound, std::string{"Not Found: "} + resource.url);
+        } else {
+            response.data = it->second;
+        }
+        callback(response);
+        return nullptr;
+    }
+
+    void add(std::string const& key, std::string const& data) {
+        assets.emplace(key, std::make_shared<std::string>(data));
+    };
+
+  private:
+    std::unordered_map<std::string, std::shared_ptr<std::string>> assets;
+};
+
+TEST(SyncFileSource, LoadSyncRender) {
+    util::RunLoop loop;
+    auto fs = std::make_shared<SyncFileSource>();
+    fs->add("mapbox://mapbox.mapbox-terrain-v2,mapbox.mapbox-streets-v7",util::read_file("./test/fixtures/resources/source_vector.json"));
+    fs->add("mapbox://sprites/mapbox/streets-v9.png",util::read_file("./test/fixtures/resources/sprite.png"));
+    fs->add("mapbox://sprites/mapbox/streets-v9.json",util::read_file("./test/fixtures/resources/sprite.json"));
+    HeadlessFrontend frontend{{512,512}, 1.0};
+    MapAdapter map{frontend, MapObserver::nullObserver(), fs, MapOptions()};
+    map.getStyle().loadJSON(util::read_file("./test/fixtures/resources/style_vector.json"));
+}
diff --git a/test/test-files.json b/test/test-files.json
index e46f833269..801a1fac85 100644
--- a/test/test-files.json
+++ b/test/test-files.json
@@ -35,6 +35,7 @@
         "test/src/mbgl/test/stub_file_source.cpp",
         "test/src/mbgl/test/test.cpp",
         "test/src/mbgl/test/util.cpp",
+        "test/storage/sync_file_source.test.cpp",
         "test/storage/asset_file_source.test.cpp",
         "test/storage/default_file_source.test.cpp",
         "test/storage/headers.test.cpp",
-- 
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