Actually use test_runner::run_gdb (I forgor)

citro3d/Cargo.toml

@@ -13,3 +13,6 @@ citro3d-sys = { git = "https://github.com/rust3ds/citro3d-rs.git" }
 ctru-rs = { git = "https://github.com/rust3ds/ctru-rs.git" }
 ctru-sys = { git = "https://github.com/rust3ds/ctru-rs.git" }
 libc = "0.2.125"
+
+[dev-dependencies]
+test-runner = { git = "https://github.com/rust3ds/test-runner.git" }

citro3d/src/lib.rs

@@ -1,4 +1,6 @@
 //! Safe Rust bindings to `citro3d`.
+#![feature(custom_test_frameworks)]
+#![test_runner(test_runner::run_gdb)]
 
 pub mod attrib;
 pub mod buffer;