Use default rust directory structure for tests

tests/looping.rs

@@ -0,0 +1,27 @@
+extern crate rhai;
+
+use rhai::Engine;
+
+#[test]
+fn test_loop() {
+	let mut engine = Engine::new();
+
+	assert!(
+		engine.eval::<bool>("
+			let x = 0;
+			let i = 0;
+
+			loop {
+				if i < 10 {
+					x = x + i;
+					i = i + 1;
+				}
+				else {
+					break;
+				}
+			}
+
+			x == 45
+		").unwrap()
+	)
+}