diff --git a/.travis.yml b/.travis.yml
index f2349fdd3..d88fa71e8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,6 +11,9 @@ env:
   matrix:
    - BUILDTYPE=Release
    - BUILDTYPE=Debug
+  global:
+   - secure: "bG4YYWMfl9API0MSRgmOaJrlGLv06tRg9KJNawBieZvBJbITPpxVGJZT3/l/SEJ+Rl15e2dRex4k+MGQlmT2SqPQxTEYWv1qxNigKPPcla7IWeNmWWqW8uVvFjdglojgBOK2k/xErVQtA4zDfi3mwSXH4DKwquXWsoEKmX2SV7M="
+   - secure: "Cbvap9ubVKgjPe3hUhI6JGeDZzBXHpOG9RaYKh+SdoIPhKnlJiNOYm1egomi+e4uqJInlFKuVHTw7Ng9Cun6Zm0jIxpkSchv1GpsR7hmB3UGnGed19Dw8121FwuUaktN+4YnbVlsyd+u8EHD3+h58t4eELrLrZolM4rS7DL6caA="
 
 before_install:
 - source ./scripts/setup_travis.sh
diff --git a/Makefile b/Makefile
index 65f781298..d7f6f37c4 100644
--- a/Makefile
+++ b/Makefile
@@ -29,12 +29,16 @@ test: build/test/Makefile
 
 # Runs all test cases
 run-tests: test
-	(cd build/${BUILDTYPE} && exec find . -maxdepth 1 -name "test_*" -exec {} \;)
+	BUILDTYPE=$(BUILDTYPE) ./scripts/run_tests.sh
 
 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/common/headless_view.hpp b/common/headless_view.hpp
index a203d477e..b3e1c11b9 100644
--- a/common/headless_view.hpp
+++ b/common/headless_view.hpp
@@ -29,14 +29,14 @@ private:
 
 
 private:
-#ifdef LLMR_USE_CGL
+#if LLMR_USE_CGL
     CGLContextObj gl_context;
     GLuint fbo = 0;
     GLuint fbo_depth_stencil = 0;
     GLuint fbo_color = 0;
 #endif
 
-#ifdef LLMR_USE_GLX
+#if LLMR_USE_GLX
     GLXContext gl_context = nullptr;
     XVisualInfo *x_info = nullptr;
     Display *x_display = nullptr;
diff --git a/include/llmr/util/error.hpp b/include/llmr/util/error.hpp
new file mode 100644
index 000000000..95106ff2c
--- /dev/null
+++ b/include/llmr/util/error.hpp
@@ -0,0 +1,20 @@
+#ifndef LLMR_UTIL_ERROR
+#define LLMR_UTIL_ERROR
+
+#include <stdexcept>
+#include <string>
+
+namespace llmr {
+namespace error {
+
+struct style_parse : std::exception {
+    inline style_parse(size_t offset, const char *msg) : offset(offset), msg(msg) {}
+    inline const char* what() const noexcept { return msg.c_str(); }
+    const size_t offset;
+    const std::string msg;
+};
+}
+
+}
+
+#endif
\ No newline at end of file
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/include/llmr/util/io.hpp b/include/llmr/util/io.hpp
index f1e560ffe..cdad97913 100644
--- a/include/llmr/util/io.hpp
+++ b/include/llmr/util/io.hpp
@@ -7,6 +7,7 @@ namespace llmr {
 namespace util {
 
 void write_file(const std::string &filename, const std::string &data);
+std::string read_file(const std::string &filename);
 
 }
 }
diff --git a/llmr.gyp b/llmr.gyp
index 89c006ffd..0983d23ce 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/scripts/run_tests.sh b/scripts/run_tests.sh
new file mode 100755
index 000000000..3d0c0bdd9
--- /dev/null
+++ b/scripts/run_tests.sh
@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+set -e
+set -o pipefail
+
+cd build/$BUILDTYPE
+
+for TEST in test_* ; do
+    ./$TEST
+done
diff --git a/src/style/style.cpp b/src/style/style.cpp
index fc2364da8..006376172 100644
--- a/src/style/style.cpp
+++ b/src/style/style.cpp
@@ -4,6 +4,7 @@
 #include <llmr/style/style_bucket.hpp>
 #include <llmr/util/constants.hpp>
 #include <llmr/util/time.hpp>
+#include <llmr/util/error.hpp>
 #include <csscolorparser/csscolorparser.hpp>
 
 #include <rapidjson/document.h>
@@ -102,6 +103,9 @@ void Style::loadJSON(const uint8_t *const data) {
 
     rapidjson::Document doc;
     doc.Parse<0>((const char *const)data);
+    if (doc.HasParseError()) {
+        throw error::style_parse(doc.GetErrorOffset(), doc.GetParseError());
+    }
 
     StyleParser parser;
     parser.parse(const_cast<const rapidjson::Document &>(doc));
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/src/util/io.cpp b/src/util/io.cpp
index bf519b057..1312b907b 100644
--- a/src/util/io.cpp
+++ b/src/util/io.cpp
@@ -1,8 +1,15 @@
 #include <llmr/util/io.hpp>
 
 #include <cstdio>
+#include <iostream>
+#include <sstream>
+#include <fstream>
+#include <stdexcept>
 
-void llmr::util::write_file(const std::string &filename, const std::string &data) {
+namespace llmr {
+namespace util {
+
+void write_file(const std::string &filename, const std::string &data) {
     FILE *fd = fopen(filename.c_str(), "wb");
     if (fd) {
         fwrite(data.data(), sizeof(std::string::value_type), data.size(), fd);
@@ -11,3 +18,17 @@ void llmr::util::write_file(const std::string &filename, const std::string &data
         fprintf(stderr, "Failed to open file\n");
     }
 }
+
+std::string read_file(const std::string &filename) {
+    std::ifstream file(filename);
+    if (file.good()) {
+        std::stringstream data;
+        data << file.rdbuf();
+        return data.str();
+    } else {
+        throw std::runtime_error("Cannot read file " + filename);
+    }
+}
+
+}
+}
\ No newline at end of file
diff --git a/test/fixtures/fixture_request.cpp b/test/fixtures/fixture_request.cpp
new file mode 100644
index 000000000..5cbbfda3f
--- /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 base_directory = []{
+    std::string fn = __FILE__;
+    fn.erase(fn.find_last_of("/"));
+    return fn;
+}();
+
+
+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 = base_directory + "/" + 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/glyphs/Open Sans Semibold, Arial Unicode MS Bold/0-255.pbf b/test/fixtures/glyphs/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/glyphs/Open Sans Semibold, Arial Unicode MS Bold/0-255.pbf differ
diff --git a/test/fixtures/sprites/outdoors.json b/test/fixtures/sprites/outdoors.json
new file mode 100644
index 000000000..b2a7ddf53
--- /dev/null
+++ b/test/fixtures/sprites/outdoors.json
@@ -0,0 +1 @@
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diff --git a/test/fixtures/tiles/2-2-1.vector.pbf b/test/fixtures/tiles/2-2-1.vector.pbf
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diff --git a/test/headless.cpp b/test/headless.cpp
index 385170209..0ed6e0a09 100644
--- a/test/headless.cpp
+++ b/test/headless.cpp
@@ -3,18 +3,39 @@
 #include <llmr/map/map.hpp>
 #include <llmr/util/image.hpp>
 #include <llmr/util/io.hpp>
-#include <llmr/util/timer.hpp>
+#include <llmr/util/std.hpp>
+
+#include <rapidjson/document.h>
 
 #include "../common/headless_view.hpp"
 
-#include <iostream>
-#include <fstream>
+const std::string base_directory = []{
+    std::string fn = __FILE__;
+    fn.erase(fn.find_last_of("/"));
+    return fn;
+}();
 
-TEST(Headless, initialize) {
-    const int width = 1024;
-    const int height = 768;
+class HeadlessTest : public ::testing::TestWithParam<const char *> {};
 
-    llmr::util::timer timer;
+TEST_P(HeadlessTest, render) {
+    const char *base = GetParam();
+
+    const std::string style = llmr::util::read_file(base_directory + "/fixtures/styles/" + base + ".style.json");
+    const std::string info = llmr::util::read_file(base_directory + "/fixtures/styles/" + base + ".info.json");
+    const std::string expected_image = base_directory + "/fixtures/styles/" + base + ".expected.png";
+    const std::string actual_image = base_directory + "/fixtures/styles/" + base + ".actual.png";
+
+    // Parse settings.
+    rapidjson::Document doc;
+    doc.Parse<0>((const char *const)info.c_str());
+    ASSERT_EQ(false, doc.HasParseError());
+
+    const double zoom = doc.HasMember("zoom") ? doc["zoom"].GetDouble() : 0;
+    const double angle = doc.HasMember("angle") ? doc["angle"].GetDouble() : 0;
+    const double longitude = doc.HasMember("longitude") ? doc["longitude"].GetDouble() : 0;
+    const double latitude = doc.HasMember("latitude") ? doc["latitude"].GetDouble() : 0;
+    const unsigned int width = doc.HasMember("width") ? doc["width"].GetUint() : 0;
+    const unsigned int height = doc.HasMember("height") ? doc["height"].GetUint() : 0;
 
     // Setup OpenGL
     llmr::HeadlessView view;
@@ -23,41 +44,27 @@ TEST(Headless, initialize) {
     view.resize(width, height);
     map.resize(width, height);
 
-    timer.report("map setup");
+    map.setStyleJSON(style);
 
-    std::ifstream stylefile("./style.min.js");
-    ASSERT_TRUE(stylefile.good());
-    std::stringstream stylejson;
-    stylejson << stylefile.rdbuf();
-
-    map.setStyleJSON(stylejson.str());
-
-    map.setLonLatZoom(0, 0, 2);
-    map.setAngle(0);
+    map.setLonLatZoom(longitude, latitude, zoom);
+    map.setAngle(angle);
     map.setDebug(false);
 
-    timer.report("map style");
-
     // Run the loop. It will terminate when we don't have any further listeners.
     map.run();
 
-    timer.report("map loop");
+    const std::unique_ptr<uint32_t[]> pixels(new uint32_t[width * height]);
+    glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, pixels.get());
 
-    uint32_t *pixels = new uint32_t[width * height];
+    const std::string image = llmr::util::compress_png(width, height, pixels.get(), true);
+    llmr::util::write_file(actual_image, image);
 
-    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");
-
-    delete[] pixels;
-
-    timer.report("destruct");
+    const std::string expected_image_data(llmr::util::read_file(expected_image));
+    const llmr::util::Image expected(expected_image_data, true);
+    ASSERT_EQ(width, expected.getWidth());
+    ASSERT_EQ(height, expected.getHeight());
+    ASSERT_EQ(0, std::memcmp(pixels.get(), expected.getData(), width * height * 4));
 }
+
+INSTANTIATE_TEST_CASE_P(Headless, HeadlessTest,
+                        ::testing::Values("0", "1"));
diff --git a/test/test.gyp b/test/test.gyp
index e3e08c3fd..1dce41053 100644
--- a/test/test.gyp
+++ b/test/test.gyp
@@ -15,6 +15,11 @@
                             '-framework OpenGL',
                         ],
                     },
+                    'xcode_settings': {
+                        'OTHER_LDFLAGS': [
+                            '-framework OpenGL',
+                        ],
+                    },
                 }, {
                     'link_settings': {
                         'libraries': [
@@ -161,16 +166,13 @@
             "./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',
         ]
     },
     {
diff --git a/travis/travis-resources.template b/travis/travis-resources.template
new file mode 100644
index 000000000..afe0478e3
--- /dev/null
+++ b/travis/travis-resources.template
@@ -0,0 +1,74 @@
+
+{
+    "AWSTemplateFormatVersion": "2010-09-09",
+    "Description": "mapbox-gl-native travis resources",
+    "Resources": {
+        "BuildUser": {
+            "Type": "AWS::IAM::User",
+            "Properties": {
+                "Policies": [
+                    {
+                        "PolicyName": "list",
+                        "PolicyDocument": {
+                            "Statement": [
+                                {
+                                    "Action": [
+                                        "s3:ListBucket"
+                                    ],
+                                    "Effect": "Allow",
+                                    "Resource": [
+                                        "arn:aws:s3:::mapbox-gl-testing"
+                                    ]
+                                }
+                            ]
+                        }
+                    },
+                    {
+                        "PolicyName": "build",
+                        "PolicyDocument": {
+                            "Statement": [
+                                {
+                                    "Action": [
+                                        "s3:DeleteObject",
+                                        "s3:GetObject",
+                                        "s3:GetObjectAcl",
+                                        "s3:PutObject",
+                                        "s3:PutObjectAcl"
+                                    ],
+                                    "Effect": "Allow",
+                                    "Resource": [
+                                        "arn:aws:s3:::mapbox-gl-testing/*"
+                                    ]
+                                }
+                            ]
+                        }
+                    }
+                ]
+            }
+        },
+        "BuildUserKey": {
+            "Type": "AWS::IAM::AccessKey",
+            "Properties": {
+                "UserName": {
+                    "Ref": "BuildUser"
+                }
+            }
+        }
+    },
+    "Outputs": {
+        "AccessKeyId": {
+            "Value": {
+                "Ref": "BuildUserKey"
+            }
+        },
+        "SecretAccessKey": {
+            "Value": {
+                "Fn::GetAtt": [ 
+                    "BuildUserKey",
+                    "SecretAccessKey"
+                ]
+            }
+        }
+    }
+}
+