diff --git a/Makefile b/Makefile
index 65f781298..b10b7880a 100644
--- a/Makefile
+++ b/Makefile
@@ -35,6 +35,10 @@ test/%: build/test/Makefile
 	$(MAKE) -C build/test BUILDTYPE=$(BUILDTYPE) V=$(V) $*
 	(cd build/$(BUILDTYPE) && exec ./test_$*)
 
+# build Mac OS X project for Xcode
+xtest: config.gypi clear_xcode_cache node
+	deps/run_gyp test/test.gyp --depth=. -Goutput_dir=.. --generator-output=./build -f xcode
+	open ./build/test/test.xcodeproj
 
 ##### Makefile builds ##########################################################
 
diff --git a/include/llmr/util/image.hpp b/include/llmr/util/image.hpp
index dccc18589..ac20473e8 100644
--- a/include/llmr/util/image.hpp
+++ b/include/llmr/util/image.hpp
@@ -13,7 +13,7 @@ std::string compress_png(int width, int height, void *rgba, bool flip = false);
 
 class Image {
 public:
-    Image(const std::string &img);
+    Image(const std::string &img, bool flip = false);
     ~Image();
 
     inline const char *getData() const { return img; }
diff --git a/llmr.gyp b/llmr.gyp
index 700be136a..ad92da645 100644
--- a/llmr.gyp
+++ b/llmr.gyp
@@ -7,7 +7,7 @@
     {
       'target_name': 'shaders',
       'type': 'none',
-      # 'hard_dependency': 1,
+      'hard_dependency': 1,
       'actions': [
         {
           'action_name': 'Build Shaders',
diff --git a/src/util/image.cpp b/src/util/image.cpp
index 2d4eb3602..f29f3451b 100644
--- a/src/util/image.cpp
+++ b/src/util/image.cpp
@@ -84,7 +84,7 @@ void warningHandler(png_structp, png_const_charp error_msg) {
     fprintf(stderr, "PNG: %s\n", error_msg);
 }
 
-Image::Image(const std::string &data) {
+Image::Image(const std::string &data, bool flip) {
     Buffer buffer(data);
 
     if (buffer.length < 8 || !png_check_sig((const png_bytep)buffer.data, 8)) {
@@ -148,7 +148,7 @@ Image::Image(const std::string &data) {
             png_bytep *rows = nullptr;
         } pointers(height);
         for (unsigned i = 0; i < height; ++i) {
-            pointers.rows[i] = (png_bytep)(surface + (i * rowbytes));
+            pointers.rows[flip ? height - 1 - i : i] = (png_bytep)(surface + (i * rowbytes));
         }
 
         // Read image data
diff --git a/test/fixtures/fixture_request.cpp b/test/fixtures/fixture_request.cpp
new file mode 100644
index 000000000..39e8434b1
--- /dev/null
+++ b/test/fixtures/fixture_request.cpp
@@ -0,0 +1,100 @@
+#include <llmr/platform/platform.hpp>
+#include <llmr/platform/request.hpp>
+#include <llmr/util/uv.hpp>
+
+const std::string basename = []{
+    std::string basename = __FILE__;
+    basename.erase(basename.find_last_of("/"));
+    return basename;
+}();
+
+
+namespace llmr {
+
+std::shared_ptr<platform::Request>
+platform::request_http(const std::string &url,
+                       std::function<void(Response *)> callback,
+                       std::shared_ptr<uv::loop> loop) {
+    uv_loop_t *l = nullptr;
+    if (loop) {
+        l = **loop;
+    } else {
+        l = uv_default_loop();
+    }
+
+    std::string clean_url = basename + "/" + url;
+    auto pos = clean_url.find("://");
+    if (pos != std::string::npos) {
+        clean_url.replace(pos, 3, "/");
+    }
+
+    std::replace(clean_url.begin(), clean_url.end(), '+', ' ');
+
+    std::shared_ptr<Request> req = std::make_shared<Request>(url, callback, loop);
+
+    int err;
+
+    uv_fs_t open_req;
+    err = uv_fs_open(l, &open_req, clean_url.c_str(), O_RDONLY, S_IRUSR, nullptr);
+    uv_fs_req_cleanup(&open_req);
+    if (err < 0) {
+        req->res->code = err;
+        req->res->error_message = uv_strerror(err);
+        req->complete();
+        return req;
+    }
+    uv_file fd = err;
+
+    uv_fs_t stat_req;
+    uv_fs_fstat(l, &stat_req, fd, nullptr);
+    uv_fs_req_cleanup(&stat_req);
+    err = uv_fs_fstat(l, &stat_req, fd, nullptr);
+    if (err < 0) {
+        req->res->code = err;
+        req->res->error_message = uv_strerror(err);
+        req->complete();
+        return req;
+    }
+
+    const uint64_t size = static_cast<const uv_stat_t*>(stat_req.ptr)->st_size;
+
+
+    std::string body;
+    body.resize(size);
+    uv_buf_t uvbuf = uv_buf_init(const_cast<char *>(body.data()), body.size());
+
+    uv_fs_t read_req;
+    err = uv_fs_read(l, &read_req, fd, &uvbuf, 1, 0, nullptr);
+    uv_fs_req_cleanup(&read_req);
+    if (err < 0) {
+        req->res->code = err;
+        req->res->error_message = uv_strerror(err);
+        req->complete();
+        return req;
+    }
+
+
+    uv_fs_t close_req;
+    err = uv_fs_close(l, &close_req, fd, nullptr);
+    uv_fs_req_cleanup(&close_req);
+    if (err < 0) {
+        req->res->code = err;
+        req->res->error_message = uv_strerror(err);
+        req->complete();
+        return req;
+    }
+
+    req->res->body.swap(body);
+    req->res->code = 200;
+    req->complete();
+
+    return req;
+}
+
+void platform::cancel_request_http(const std::shared_ptr<Request> &req) {
+    if (req) {
+        req->cancelled = true;
+    }
+}
+
+} // end namespace llmr
diff --git a/test/fixtures/http/api.tiles.mapbox.com/v3/mapbox.mapbox-terrain-v1,mapbox.mapbox-streets-v5/0/0/0.vector.pbf b/test/fixtures/http/api.tiles.mapbox.com/v3/mapbox.mapbox-terrain-v1,mapbox.mapbox-streets-v5/0/0/0.vector.pbf
new file mode 100644
index 000000000..5eee52935
Binary files /dev/null and b/test/fixtures/http/api.tiles.mapbox.com/v3/mapbox.mapbox-terrain-v1,mapbox.mapbox-streets-v5/0/0/0.vector.pbf differ
diff --git a/test/fixtures/http/api.tiles.mapbox.com/v3/mapbox.mapbox-terrain-v1,mapbox.mapbox-streets-v5/2/1/1.vector.pbf b/test/fixtures/http/api.tiles.mapbox.com/v3/mapbox.mapbox-terrain-v1,mapbox.mapbox-streets-v5/2/1/1.vector.pbf
new file mode 100644
index 000000000..00a5435b7
Binary files /dev/null and b/test/fixtures/http/api.tiles.mapbox.com/v3/mapbox.mapbox-terrain-v1,mapbox.mapbox-streets-v5/2/1/1.vector.pbf differ
diff --git a/test/fixtures/http/api.tiles.mapbox.com/v3/mapbox.mapbox-terrain-v1,mapbox.mapbox-streets-v5/2/1/2.vector.pbf b/test/fixtures/http/api.tiles.mapbox.com/v3/mapbox.mapbox-terrain-v1,mapbox.mapbox-streets-v5/2/1/2.vector.pbf
new file mode 100644
index 000000000..4d26226c5
Binary files /dev/null and b/test/fixtures/http/api.tiles.mapbox.com/v3/mapbox.mapbox-terrain-v1,mapbox.mapbox-streets-v5/2/1/2.vector.pbf differ
diff --git a/test/fixtures/http/api.tiles.mapbox.com/v3/mapbox.mapbox-terrain-v1,mapbox.mapbox-streets-v5/2/2/1.vector.pbf b/test/fixtures/http/api.tiles.mapbox.com/v3/mapbox.mapbox-terrain-v1,mapbox.mapbox-streets-v5/2/2/1.vector.pbf
new file mode 100644
index 000000000..a92e85b60
Binary files /dev/null and b/test/fixtures/http/api.tiles.mapbox.com/v3/mapbox.mapbox-terrain-v1,mapbox.mapbox-streets-v5/2/2/1.vector.pbf differ
diff --git a/test/fixtures/http/api.tiles.mapbox.com/v3/mapbox.mapbox-terrain-v1,mapbox.mapbox-streets-v5/2/2/2.vector.pbf b/test/fixtures/http/api.tiles.mapbox.com/v3/mapbox.mapbox-terrain-v1,mapbox.mapbox-streets-v5/2/2/2.vector.pbf
new file mode 100644
index 000000000..209014708
Binary files /dev/null and b/test/fixtures/http/api.tiles.mapbox.com/v3/mapbox.mapbox-terrain-v1,mapbox.mapbox-streets-v5/2/2/2.vector.pbf differ
diff --git a/test/fixtures/https/mapbox.s3.amazonaws.com/gl-glyphs-256/Open Sans Semibold, Arial Unicode MS Bold/0-255.pbf b/test/fixtures/https/mapbox.s3.amazonaws.com/gl-glyphs-256/Open Sans Semibold, Arial Unicode MS Bold/0-255.pbf
new file mode 100644
index 000000000..cea1c094d
Binary files /dev/null and b/test/fixtures/https/mapbox.s3.amazonaws.com/gl-glyphs-256/Open Sans Semibold, Arial Unicode MS Bold/0-255.pbf differ
diff --git a/test/fixtures/https/www.mapbox.com/mapbox-gl-styles/sprites/outdoors.json b/test/fixtures/https/www.mapbox.com/mapbox-gl-styles/sprites/outdoors.json
new file mode 100644
index 000000000..b2a7ddf53
--- /dev/null
+++ b/test/fixtures/https/www.mapbox.com/mapbox-gl-styles/sprites/outdoors.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/test/fixtures/https/www.mapbox.com/mapbox-gl-styles/sprites/outdoors.png b/test/fixtures/https/www.mapbox.com/mapbox-gl-styles/sprites/outdoors.png
new file mode 100644
index 000000000..61e99085f
Binary files /dev/null and b/test/fixtures/https/www.mapbox.com/mapbox-gl-styles/sprites/outdoors.png differ
diff --git a/test/fixtures/result/out.png b/test/fixtures/result/out.png
new file mode 100644
index 000000000..aff3dccbb
Binary files /dev/null and b/test/fixtures/result/out.png differ
diff --git a/test/headless.cpp b/test/headless.cpp
index 385170209..57d351bb8 100644
--- a/test/headless.cpp
+++ b/test/headless.cpp
@@ -10,9 +10,15 @@
 #include <iostream>
 #include <fstream>
 
+const std::string basename = []{
+    std::string basename = __FILE__;
+    basename.erase(basename.find_last_of("/"));
+    return basename;
+}();
+
 TEST(Headless, initialize) {
-    const int width = 1024;
-    const int height = 768;
+    const unsigned int width = 1024;
+    const unsigned int height = 768;
 
     llmr::util::timer timer;
 
@@ -32,12 +38,12 @@ TEST(Headless, initialize) {
 
     map.setStyleJSON(stylejson.str());
 
+    timer.report("map style");
+
     map.setLonLatZoom(0, 0, 2);
     map.setAngle(0);
     map.setDebug(false);
 
-    timer.report("map style");
-
     // Run the loop. It will terminate when we don't have any further listeners.
     map.run();
 
@@ -47,17 +53,18 @@ TEST(Headless, initialize) {
 
     glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 
-    timer.report("gl readpixels");
-
     std::string result = llmr::util::compress_png(width, height, pixels, true);
-
-    timer.report("compress png");
-
     llmr::util::write_file("out.png", result);
 
-    timer.report("save file");
+    std::ifstream imagefile(basename + "/fixtures/result/out.png");
+    ASSERT_TRUE(imagefile.good());
+    std::stringstream image;
+    image << imagefile.rdbuf();
+    llmr::util::Image reference(image.str(), true);
+
+    ASSERT_EQ(reference.getWidth(), width);
+    ASSERT_EQ(reference.getHeight(), height);
+    ASSERT_EQ(0, std::memcmp(pixels, reference.getData(), width * height * 4));
 
     delete[] pixels;
-
-    timer.report("destruct");
 }
diff --git a/test/test.gyp b/test/test.gyp
index 340a73ba3..bb4bfc759 100644
--- a/test/test.gyp
+++ b/test/test.gyp
@@ -15,6 +15,11 @@
                             '-framework OpenGL',
                         ],
                     },
+                    'xcode_settings': {
+                        'OTHER_LDFLAGS': [
+                            '-framework OpenGL',
+                        ],
+                    },
                 }, {
                     'link_settings': {
                         'libraries': [
@@ -145,16 +150,13 @@
             "./headless.cpp",
             "../common/headless_view.hpp",
             "../common/headless_view.cpp",
-            "../common/curl_request.hpp",
-            "../common/curl_request.cpp",
+            "./fixtures/fixture_request.cpp",
         ],
         "dependencies": [
             "../deps/gtest/gtest.gyp:gtest",
             "../llmr.gyp:llmr-x86",
             "link_gl",
-            "link_curl",
             '../llmr.gyp:copy_default_stylesheet',
-            '../llmr.gyp:copy_certificate_bundle',
         ]
     },
     {