diff --git a/crates/webidl/Cargo.toml b/crates/webidl/Cargo.toml
index fb23661c..51544224 100644
--- a/crates/webidl/Cargo.toml
+++ b/crates/webidl/Cargo.toml
@@ -7,7 +7,12 @@ authors = ["Nick Fitzgerald <fitzgen@gmail.com>"]
 name = "webidl-all"
 path = "tests/all/lib.rs"
 
+[[test]]
+name = "webidl-expected"
+path = "tests/expected/lib.rs"
+
 [dev-dependencies]
+wasm-bindgen = { version = "=0.2.11", path = "../..", default-features = false }
 wasm-bindgen-backend = { version = "=0.2.11", path = "../backend", features = ["extra-traits"] }
 diff = "0.1.11"
 
diff --git a/crates/webidl/tests/expected/lib.rs b/crates/webidl/tests/expected/lib.rs
new file mode 100755
index 00000000..521c2cad
--- /dev/null
+++ b/crates/webidl/tests/expected/lib.rs
@@ -0,0 +1,6 @@
+#![feature(wasm_custom_section)]
+#![allow(bad_style)]
+
+extern crate wasm_bindgen;
+
+mod Event;