Code refactor, bug fixes, code docs.

tests/engine.rs

@@ -0,0 +1,14 @@
+use rhai::{Engine, EvalAltResult};
+
+#[test]
+fn test_engine_call_fn() -> Result<(), EvalAltResult> {
+    let mut engine = Engine::new();
+
+    let ast = Engine::compile("fn hello(x, y) { x.len() + y }")?;
+
+    let result: i64 = engine.call_fn("hello", ast, (&mut String::from("abc"), &mut 123_i64))?;
+
+    assert_eq!(result, 126);
+
+    Ok(())
+}

tests/get_set.rs

@@ -78,7 +78,7 @@ fn test_big_get_set() -> Result<(), EvalAltResult> {
     let mut engine = Engine::new();
 
     engine.register_type::<TestChild>();
-    engine.register_type::<TestParent>();
+    engine.register_type_with_name::<TestParent>("TestParent");
 
     engine.register_get_set("x", TestChild::get_x, TestChild::set_x);
     engine.register_get_set("child", TestParent::get_child, TestParent::set_child);
@@ -90,5 +90,10 @@ fn test_big_get_set() -> Result<(), EvalAltResult> {
         500
     );
 
+    assert_eq!(
+        engine.eval::<String>("let a = new_tp(); a.type_of()")?,
+        "TestParent"
+    );
+
     Ok(())
 }