diff --git a/test/api/annotations.cpp b/test/api/annotations.cpp
index 4c06b39e4..7514fc2dc 100644
--- a/test/api/annotations.cpp
+++ b/test/api/annotations.cpp
@@ -14,6 +14,18 @@
 
 using namespace mbgl;
 
+namespace {
+
+std::string getFileSourceRoot() {
+#ifdef MBGL_ASSET_ZIP
+    return "test/fixtures/annotations/assets.zip";
+#else
+    return "";
+#endif
+}
+
+}
+
 std::shared_ptr<SpriteImage> defaultMarker() {
     PremultipliedImage image = decodeImage(util::read_file("test/fixtures/sprites/default_marker.png"));
     return std::make_shared<SpriteImage>(image.width, image.height, 1.0, std::string(reinterpret_cast<char*>(image.data.get()), image.size()));
@@ -36,7 +48,7 @@ void checkRendering(Map& map, const char * name) {
 TEST(Annotations, PointAnnotation) {
     auto display = std::make_shared<mbgl::HeadlessDisplay>();
     HeadlessView view(display, 1);
-    DefaultFileSource fileSource(nullptr);
+    DefaultFileSource fileSource(nullptr, getFileSourceRoot());
 
     Map map(view, fileSource, MapMode::Still);
     map.setStyleJSON(util::read_file("test/fixtures/api/empty.json"), "");
@@ -49,7 +61,7 @@ TEST(Annotations, PointAnnotation) {
 TEST(Annotations, LineAnnotation) {
     auto display = std::make_shared<mbgl::HeadlessDisplay>();
     HeadlessView view(display, 1);
-    DefaultFileSource fileSource(nullptr);
+    DefaultFileSource fileSource(nullptr, getFileSourceRoot());
 
     Map map(view, fileSource, MapMode::Still);
     map.setStyleJSON(util::read_file("test/fixtures/api/empty.json"), "");
@@ -68,7 +80,7 @@ TEST(Annotations, LineAnnotation) {
 TEST(Annotations, FillAnnotation) {
     auto display = std::make_shared<mbgl::HeadlessDisplay>();
     HeadlessView view(display, 1);
-    DefaultFileSource fileSource(nullptr);
+    DefaultFileSource fileSource(nullptr, getFileSourceRoot());
 
     Map map(view, fileSource, MapMode::Still);
     map.setStyleJSON(util::read_file("test/fixtures/api/empty.json"), "");
@@ -86,7 +98,7 @@ TEST(Annotations, FillAnnotation) {
 TEST(Annotations, StyleSourcedShapeAnnotation) {
     auto display = std::make_shared<mbgl::HeadlessDisplay>();
     HeadlessView view(display, 1);
-    DefaultFileSource fileSource(nullptr);
+    DefaultFileSource fileSource(nullptr, getFileSourceRoot());
 
     Map map(view, fileSource, MapMode::Still);
     map.setStyleJSON(util::read_file("test/fixtures/api/annotation.json"), "");
@@ -101,7 +113,7 @@ TEST(Annotations, StyleSourcedShapeAnnotation) {
 TEST(Annotations, AddMultiple) {
     auto display = std::make_shared<mbgl::HeadlessDisplay>();
     HeadlessView view(display, 1);
-    DefaultFileSource fileSource(nullptr);
+    DefaultFileSource fileSource(nullptr, getFileSourceRoot());
 
     Map map(view, fileSource, MapMode::Still);
     map.setStyleJSON(util::read_file("test/fixtures/api/empty.json"), "");
@@ -118,7 +130,7 @@ TEST(Annotations, AddMultiple) {
 TEST(Annotations, NonImmediateAdd) {
     auto display = std::make_shared<mbgl::HeadlessDisplay>();
     HeadlessView view(display, 1);
-    DefaultFileSource fileSource(nullptr);
+    DefaultFileSource fileSource(nullptr, getFileSourceRoot());
 
     Map map(view, fileSource, MapMode::Still);
     map.setStyleJSON(util::read_file("test/fixtures/api/empty.json"), "");
@@ -138,7 +150,7 @@ TEST(Annotations, NonImmediateAdd) {
 TEST(Annotations, RemovePoint) {
     auto display = std::make_shared<mbgl::HeadlessDisplay>();
     HeadlessView view(display, 1);
-    DefaultFileSource fileSource(nullptr);
+    DefaultFileSource fileSource(nullptr, getFileSourceRoot());
 
     Map map(view, fileSource, MapMode::Still);
     map.setStyleJSON(util::read_file("test/fixtures/api/empty.json"), "");
@@ -155,7 +167,7 @@ TEST(Annotations, RemovePoint) {
 TEST(Annotations, RemoveShape) {
     auto display = std::make_shared<mbgl::HeadlessDisplay>();
     HeadlessView view(display, 1);
-    DefaultFileSource fileSource(nullptr);
+    DefaultFileSource fileSource(nullptr, getFileSourceRoot());
 
     AnnotationSegments segments = {{ {{ { 0, 0 }, { 45, 45 } }} }};
 
@@ -177,7 +189,7 @@ TEST(Annotations, RemoveShape) {
 TEST(Annotations, ImmediateRemoveShape) {
     auto display = std::make_shared<mbgl::HeadlessDisplay>();
     HeadlessView view(display, 1);
-    DefaultFileSource fileSource(nullptr);
+    DefaultFileSource fileSource(nullptr, getFileSourceRoot());
     Map map(view, fileSource, MapMode::Still);
 
     map.removeAnnotation(map.addShapeAnnotation(ShapeAnnotation({}, {})));
@@ -189,7 +201,7 @@ TEST(Annotations, ImmediateRemoveShape) {
 TEST(Annotations, SwitchStyle) {
     auto display = std::make_shared<mbgl::HeadlessDisplay>();
     HeadlessView view(display, 1);
-    DefaultFileSource fileSource(nullptr);
+    DefaultFileSource fileSource(nullptr, getFileSourceRoot());
 
     Map map(view, fileSource, MapMode::Still);
     map.setStyleJSON(util::read_file("test/fixtures/api/empty.json"), "");
diff --git a/test/api/repeated_render.cpp b/test/api/repeated_render.cpp
index 77e4569db..d92dcf290 100644
--- a/test/api/repeated_render.cpp
+++ b/test/api/repeated_render.cpp
@@ -17,7 +17,11 @@ TEST(API, RepeatedRender) {
 
     auto display = std::make_shared<mbgl::HeadlessDisplay>();
     HeadlessView view(display, 1, 256, 512);
+#ifdef MBGL_ASSET_ZIP
+    DefaultFileSource fileSource(nullptr, "test/fixtures/api/assets.zip");
+#else
     DefaultFileSource fileSource(nullptr);
+#endif
 
     Log::setObserver(std::make_unique<FixtureLogObserver>());
 
diff --git a/test/fixtures/annotations/assets.zip b/test/fixtures/annotations/assets.zip
new file mode 100644
index 000000000..869380034
Binary files /dev/null and b/test/fixtures/annotations/assets.zip differ
diff --git a/test/fixtures/api/assets.zip b/test/fixtures/api/assets.zip
new file mode 100644
index 000000000..42a30f1c2
Binary files /dev/null and b/test/fixtures/api/assets.zip differ
diff --git a/test/storage/directory_reading.cpp b/test/storage/directory_reading.cpp
index 72aabe2eb..5ef2983ab 100644
--- a/test/storage/directory_reading.cpp
+++ b/test/storage/directory_reading.cpp
@@ -27,7 +27,7 @@ TEST_F(Storage, AssetReadDirectory) {
         EXPECT_EQ(Seconds::zero(), res.modified);
         EXPECT_EQ("", res.etag);
 #ifdef MBGL_ASSET_ZIP
-        EXPECT_EQ("No such file", res.error->message);
+        EXPECT_EQ("Could not stat file in zip archive", res.error->message);
 #elif MBGL_ASSET_FS
         EXPECT_EQ("Is a directory", res.error->message);
 #endif
diff --git a/test/storage/file_reading.cpp b/test/storage/file_reading.cpp
index 8d3830309..1b1b1b288 100644
--- a/test/storage/file_reading.cpp
+++ b/test/storage/file_reading.cpp
@@ -4,6 +4,91 @@
 #include <mbgl/platform/platform.hpp>
 #include <mbgl/util/chrono.hpp>
 #include <mbgl/util/run_loop.hpp>
+#include <mbgl/util/thread.hpp>
+
+namespace {
+
+std::string getFileSourceRoot() {
+#ifdef MBGL_ASSET_ZIP
+    return "test/fixtures/storage/assets.zip";
+#else
+    return "";
+#endif
+}
+
+class TestWorker {
+public:
+    TestWorker(mbgl::DefaultFileSource* fs_) : fs(fs_) {}
+
+    void run(std::function<void()> endCallback) {
+        const std::string asset("asset://TEST_DATA/fixtures/storage/nonempty");
+
+        requestCallback = [this, asset, endCallback](mbgl::Response res) {
+            EXPECT_EQ(nullptr, res.error);
+            ASSERT_TRUE(res.data.get());
+            EXPECT_EQ("content is here\n", *res.data);
+
+            if (res.stale) {
+                return;
+            }
+
+            if (!--numRequests) {
+                endCallback();
+                request.reset();
+            } else {
+                request = fs->request({ mbgl::Resource::Unknown, asset }, requestCallback);
+            }
+        };
+
+        request = fs->request({ mbgl::Resource::Unknown, asset }, requestCallback);
+    }
+
+private:
+    unsigned numRequests = 1000;
+
+    mbgl::DefaultFileSource* fs;
+    std::unique_ptr<mbgl::FileRequest> request;
+
+    std::function<void(mbgl::Response)> requestCallback;
+};
+
+}
+
+TEST_F(Storage, AssetStress) {
+    SCOPED_TEST(AssetStress)
+
+    using namespace mbgl;
+
+    util::RunLoop loop;
+
+    mbgl::DefaultFileSource fs(nullptr, getFileSourceRoot());
+
+    unsigned numThreads = 50;
+
+    auto callback = [&] {
+        if (!--numThreads) {
+            loop.stop();
+        }
+    };
+
+    std::vector<std::unique_ptr<util::Thread<TestWorker>>> threads;
+    std::vector<std::unique_ptr<mbgl::WorkRequest>> requests;
+    util::ThreadContext context = { "Test", util::ThreadType::Map, util::ThreadPriority::Regular };
+
+    for (unsigned i = 0; i < numThreads; ++i) {
+        std::unique_ptr<util::Thread<TestWorker>> thread =
+            std::make_unique<util::Thread<TestWorker>>(context, &fs);
+
+        requests.push_back(
+            thread->invokeWithCallback(&TestWorker::run, callback));
+
+        threads.push_back(std::move(thread));
+    }
+
+    loop.run();
+
+    AssetStress.finish();
+}
 
 TEST_F(Storage, AssetEmptyFile) {
     SCOPED_TEST(EmptyFile)
@@ -12,11 +97,7 @@ TEST_F(Storage, AssetEmptyFile) {
 
     util::RunLoop loop;
 
-#ifdef MBGL_ASSET_ZIP
-    DefaultFileSource fs(nullptr, "test/fixtures/storage/assets.zip");
-#else
-    DefaultFileSource fs(nullptr);
-#endif
+    DefaultFileSource fs(nullptr, getFileSourceRoot());
 
     std::unique_ptr<FileRequest> req = fs.request({ Resource::Unknown, "asset://TEST_DATA/fixtures/storage/empty" }, [&](Response res) {
         req.reset();
@@ -41,11 +122,7 @@ TEST_F(Storage, AssetNonEmptyFile) {
 
     util::RunLoop loop;
 
-#ifdef MBGL_ASSET_ZIP
-    DefaultFileSource fs(nullptr, "test/fixtures/storage/assets.zip");
-#else
-    DefaultFileSource fs(nullptr);
-#endif
+    DefaultFileSource fs(nullptr, getFileSourceRoot());
 
     std::unique_ptr<FileRequest> req = fs.request({ Resource::Unknown, "asset://TEST_DATA/fixtures/storage/nonempty" }, [&](Response res) {
         req.reset();
@@ -72,11 +149,7 @@ TEST_F(Storage, AssetNonExistentFile) {
 
     util::RunLoop loop;
 
-#ifdef MBGL_ASSET_ZIP
-    DefaultFileSource fs(nullptr, "test/fixtures/storage/assets.zip");
-#else
-    DefaultFileSource fs(nullptr);
-#endif
+    DefaultFileSource fs(nullptr, getFileSourceRoot());
 
     std::unique_ptr<FileRequest> req = fs.request({ Resource::Unknown, "asset://TEST_DATA/fixtures/storage/does_not_exist" }, [&](Response res) {
         req.reset();
@@ -88,7 +161,7 @@ TEST_F(Storage, AssetNonExistentFile) {
         EXPECT_EQ(Seconds::zero(), res.modified);
         EXPECT_EQ("", res.etag);
 #ifdef MBGL_ASSET_ZIP
-        EXPECT_EQ("No such file", res.error->message);
+        EXPECT_EQ("Could not stat file in zip archive", res.error->message);
 #elif MBGL_ASSET_FS
         EXPECT_EQ("No such file or directory", res.error->message);
 #endif