webidl: make writing new tests really easy

crates/webidl/tests/all/lib.rs

@@ -1,21 +1,41 @@
+extern crate diff;
 extern crate proc_macro2;
 extern crate syn;
 extern crate wasm_bindgen_backend as backend;
 extern crate wasm_bindgen_webidl as wb_webidl;
 
-pub fn assert_parse(webidl: &str, expected: backend::ast::Program) {
-    let actual = wb_webidl::parse(webidl).expect("should parse the webidl source OK");
-    assert_eq!(expected, actual);
-}
+#[macro_use]
+mod util;
+use util::*;
 
-macro_rules! assert_parse {
-    ($test_name:ident, $webidl_source:expr, $expected_ast:expr) => {
-        #[test]
-        fn $test_name() {
-            $crate::assert_parse($webidl_source, $expected_ast);
+/// Tests for parsing WebIDL into an expected wasm-bindgen AST.
+mod parse {
+    use super::*;
+
+    assert_parse!(empty, backend::ast::Program::default());
+
+    assert_parse!(
+        Event,
+        backend::ast::Program {
+            exports: vec![],
+            imports: vec![backend::ast::Import {
+                module: None,
+                version: None,
+                js_namespace: None,
+                kind: backend::ast::ImportKind::Type(backend::ast::ImportType {
+                    vis: syn::Visibility::Public(syn::VisPublic {
+                        pub_token: Default::default(),
+                    }),
+                    name: syn::Ident::new("Event", proc_macro2::Span::call_site()),
+                }),
+            }],
+            enums: vec![],
+            structs: vec![],
         }
-    };
+    );
 }
 
-mod event;
-mod simple;
+/// Tests for compiling WebIDL into Rust bindings.
+mod compile {
+    assert_compile!(Event);
+}