From c71625e301311d2efc6c53c3b13927cfe1e7ec55 Mon Sep 17 00:00:00 2001
From: Tomaka17 <pierre.krieger1708@gmail.com>
Date: Sat, 11 Oct 2014 20:38:52 +0200
Subject: Add test for headless rendering

---
 tests/headless.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/tests/headless.rs b/tests/headless.rs
index b9ae598..ffc74b3 100644
--- a/tests/headless.rs
+++ b/tests/headless.rs
@@ -1,7 +1,14 @@
 #![feature(phase)]
 #![feature(tuple_indexing)]
 
+#[phase(plugin)]
+extern crate gl_generator;
 extern crate glutin;
+extern crate libc;
+
+mod gl {
+    generate_gl_bindings!("gl", "core", "1.1", "struct")
+}
 
 #[cfg(feature = "headless")]
 #[test]
@@ -10,4 +17,13 @@ fn main() {
 
     unsafe { window.make_current() };
 
+    let gl = gl::Gl::load_with(|symbol| window.get_proc_address(symbol));
+
+    gl.ClearColor(0.0, 1.0, 0.0, 1.0);
+    gl.Clear(gl::COLOR_BUFFER_BIT);
+
+    let mut value: (u8, u8, u8, u8) = unsafe { std::mem::uninitialized() };
+    unsafe { gl.ReadPixels(0, 0, 1, 1, gl::RGBA, gl::UNSIGNED_BYTE, std::mem::transmute(&mut value)) };
+
+    assert_eq!(value, (0, 255, 0, 255));
 }
-- 
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