Add test for NativeCallContext.

tests/native.rs

@@ -0,0 +1,34 @@
+use rhai::{Dynamic, Engine, EvalAltResult, NativeCallContext, RegisterFn, INT};
+use std::any::TypeId;
+
+#[test]
+fn test_native_context() -> Result<(), Box<EvalAltResult>> {
+    fn add_double(
+        context: NativeCallContext,
+        args: &mut [&mut Dynamic],
+    ) -> Result<Dynamic, Box<EvalAltResult>> {
+        let x = args[0].as_int().unwrap();
+        let y = args[1].as_int().unwrap();
+        Ok(format!("{}_{}", context.fn_name(), x + 2 * y).into())
+    }
+
+    let mut engine = Engine::new();
+
+    engine
+        .register_raw_fn(
+            "add_double",
+            &[TypeId::of::<INT>(), TypeId::of::<INT>()],
+            add_double,
+        )
+        .register_raw_fn(
+            "adbl",
+            &[TypeId::of::<INT>(), TypeId::of::<INT>()],
+            add_double,
+        );
+
+    assert_eq!(engine.eval::<String>("add_double(40, 1)")?, "add_double_42");
+
+    assert_eq!(engine.eval::<String>("adbl(40, 1)")?, "adbl_42");
+
+    Ok(())
+}