add tests.

src/display/CMakeLists.txt

@@ -4,8 +4,8 @@
 # https://opensource.org/licenses/MIT
 
 # Sources
-target_sources(${DUSK_TARGET_NAME}
-  PRIVATE
+target_sources(${DUSK_LIBRARY_TARGET_NAME}
+  PUBLIC
     display.c
     framebuffer.c
     camera.c
@@ -20,16 +20,16 @@ add_subdirectory(palette)
 add_subdirectory(tileset)
 
 if(DUSK_TARGET_SYSTEM STREQUAL "linux")
-  target_compile_definitions(${DUSK_TARGET_NAME}
-    PRIVATE
+  target_compile_definitions(${DUSK_LIBRARY_TARGET_NAME}
+    PUBLIC
       DISPLAY_SDL2=1
       DISPLAY_WINDOW_WIDTH_DEFAULT=1080
       DISPLAY_WINDOW_HEIGHT_DEFAULT=810
       DISPLAY_SCREEN_HEIGHT_DEFAULT=270
   )
 elseif(DUSK_TARGET_SYSTEM STREQUAL "psp")
-  target_compile_definitions(${DUSK_TARGET_NAME}
-    PRIVATE
+  target_compile_definitions(${DUSK_LIBRARY_TARGET_NAME}
+    PUBLIC
       DISPLAY_SDL2=1
       DISPLAY_WINDOW_WIDTH_DEFAULT=480
       DISPLAY_WINDOW_HEIGHT_DEFAULT=272