Refactor tests.

tests/internal_fn.rs

@@ -1,25 +1,30 @@
-use rhai::Engine;
+use rhai::{Engine, EvalAltResult};
 
 #[test]
-fn test_internal_fn() {
+fn test_internal_fn() -> Result<(), EvalAltResult> {
     let mut engine = Engine::new();
 
-    assert_eq!(
-        engine.eval::<i64>("fn addme(a, b) { a+b } addme(3, 4)"),
-        Ok(7)
-    );
-    assert_eq!(engine.eval::<i64>("fn bob() { return 4; 5 } bob()"), Ok(4));
+    assert_eq!(engine.eval::<i64>("fn addme(a, b) { a+b } addme(3, 4)")?, 7);
+    assert_eq!(engine.eval::<i64>("fn bob() { return 4; 5 } bob()")?, 4);
+
+    Ok(())
 }
 
 #[test]
-fn test_big_internal_fn() {
+fn test_big_internal_fn() -> Result<(), EvalAltResult> {
     let mut engine = Engine::new();
 
     assert_eq!(
         engine.eval::<i64>(
-            "fn mathme(a, b, c, d, e, f) { a - b * c + d * e - f \
-             } mathme(100, 5, 2, 9, 6, 32)",
-        ),
-        Ok(112)
+            r"
+                fn mathme(a, b, c, d, e, f) {
+                    a - b * c + d * e - f
+                }
+                mathme(100, 5, 2, 9, 6, 32)
+            ",
+        )?,
+        112
     );
+
+    Ok(())
 }