tests: Include golden images

Provide golden images so folks know what the test output should look like.
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 5327b69..d0e733d 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -4,6 +4,10 @@
 find_package (GLUT REQUIRED)
 find_package(ImageMagick COMPONENTS MagickWand)
 
+add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/golden_images.gz
+   COMMAND cp ${PROJECT_SOURCE_DIR}/tests/golden_images.tar.gz ${CMAKE_CURRENT_BINARY_DIR}
+   COMMAND tar xf ${CMAKE_CURRENT_BINARY_DIR}/golden_images.tar.gz --directory=${CMAKE_CURRENT_BINARY_DIR})
+
 if(NOT EXISTS /usr/include/glm/glm.hpp)
     message(FATAL_ERROR "Necessary libglm-dev headers cannot be found: sudo apt-get install libglm-dev")
 endif()
@@ -70,7 +74,7 @@
    COMPILE_DEFINITIONS "GTEST_LINKED_AS_SHARED_LIBRARY=1")
 target_link_libraries(xgl_image_tests XGL gtest gtest_main ${TEST_LIBRARIES})
 
-add_executable(xgl_render_tests render_tests.cpp ${COMMON_CPP} displayengine.cpp)
+add_executable(xgl_render_tests render_tests.cpp ${COMMON_CPP} displayengine.cpp golden_images.gz)
 set_target_properties(xgl_render_tests
    PROPERTIES
    COMPILE_DEFINITIONS "GTEST_LINKED_AS_SHARED_LIBRARY=1")
diff --git a/tests/golden_images.tar.gz b/tests/golden_images.tar.gz
new file mode 100644
index 0000000..4cf96cd
--- /dev/null
+++ b/tests/golden_images.tar.gz
Binary files differ