Add unit test for HtmlHrElement web_sys binding (#591)

crates/web-sys/tests/wasm/element.js

@@ -26,6 +26,10 @@ export function new_head() {
   return document.createElement("head");
 }
 
+export function new_hr() {
+    return document.createElement("hr");
+}
+
 export function new_html() {
   return document.createElement("html");
 }

crates/web-sys/tests/wasm/hr_element.rs

@@ -0,0 +1,24 @@
+use wasm_bindgen_test::*;
+use wasm_bindgen::prelude::*;
+use web_sys::HtmlHrElement;
+
+#[wasm_bindgen(module = "./tests/wasm/element.js")]
+extern {
+    fn new_hr() -> HtmlHrElement;
+}
+
+#[wasm_bindgen_test]
+fn test_hr_element() {
+    let hr = new_hr();
+    hr.set_color("blue");
+    assert_eq!(hr.color(), "blue");
+
+    hr.set_width("128");
+    assert_eq!(hr.width(), "128");
+
+    hr.set_width("256");
+    assert_eq!(hr.width(), "256");
+
+    hr.set_no_shade(true);
+    assert_eq!(hr.no_shade(), true);
+}

crates/web-sys/tests/wasm/main.rs

@@ -17,6 +17,7 @@ pub mod element;
 pub mod head_element;
 pub mod headers;
 pub mod history;
+pub mod hr_element;
 pub mod html_element;
 pub mod html_html_element;
 pub mod response;