Vendor things

third-party/vendor/swc_ecma_visit/tests/main.rs

@@ -0,0 +1,31 @@
+use swc_common::{chain, DUMMY_SP};
+use swc_ecma_ast::{Module, Program};
+use swc_ecma_visit::{Visit, VisitWith};
+
+#[test]
+fn should_visit_program() {
+    struct Pass1<'a>(&'a mut usize);
+    struct Pass2;
+
+    impl<'a> Visit for Pass1<'a> {
+        fn visit_program(&mut self, _program: &Program) {
+            *self.0 += 1;
+        }
+    }
+
+    impl Visit for Pass2 {}
+
+    let n = Program::Module(Module {
+        span: DUMMY_SP,
+        body: vec![],
+        shebang: None,
+    });
+
+    let mut counter = 0;
+    let p1 = Pass1(&mut counter);
+    let p2 = Pass2;
+    let mut pass = chain!(p1, p2);
+    n.visit_with(&mut pass);
+
+    assert_eq!(counter, 1);
+}