add resource error integration test

tests/resource_error.rs

@@ -0,0 +1,36 @@
+use gotham_restful::ResourceError;
+
+#[derive(ResourceError)]
+enum Error {
+	#[display("I/O Error: {0}")]
+	IoError(#[from] std::io::Error),
+
+	#[status(INTERNAL_SERVER_ERROR)]
+	#[display("Internal Server Error: {0}")]
+	InternalServerError(String)
+}
+
+mod resource_error {
+	use super::Error;
+	use gotham::hyper::StatusCode;
+	use gotham_restful::IntoResponseError;
+	use mime::APPLICATION_JSON;
+
+	#[test]
+	fn io_error() {
+		let err = Error::IoError(std::io::Error::last_os_error());
+		let res = err.into_response_error().unwrap();
+		assert_eq!(res.status, StatusCode::INTERNAL_SERVER_ERROR);
+		assert_eq!(res.mime, Some(APPLICATION_JSON));
+	}
+
+	#[test]
+	fn internal_server_error() {
+		let err = Error::InternalServerError("Brocken".to_owned());
+		assert_eq!(&format!("{}", err), "Internal Server Error: Brocken");
+
+		let res = err.into_response_error().unwrap();
+		assert_eq!(res.status, StatusCode::INTERNAL_SERVER_ERROR);
+		assert_eq!(res.mime, None); // TODO shouldn't this be a json error message?
+	}
+}