Add truthy_falsy tests to main.rs

tests/wasm/main.rs

@@ -36,6 +36,7 @@ pub mod rethrow;
 pub mod simple;
 pub mod slice;
 pub mod structural;
+pub mod truthy_falsy;
 pub mod u64;
 pub mod validate_prt;
 pub mod variadic;

tests/wasm/truthy_falsy.rs

@@ -1,3 +1,6 @@
+use wasm_bindgen::prelude::*;
+use wasm_bindgen_test::*;
+
 #[wasm_bindgen_test]
 fn test_is_truthy() {
     assert_eq!(JsValue::from(0).is_truthy(), false);