Test that RegExps aren't special-cased in Web IDL anymore

Author: domenic

WebIDL/ecmascript-binding/no-regexp-special-casing.any.js

@@ -0,0 +1,47 @@
+"use strict";
+// RegExps used to be special-cased in Web IDL, but that was removed in
+// https://github.com/heycam/webidl/commit/bbb2bde. These tests check that implementations no longer
+// do any such special-casing.
+
+test(() => {
+  const regExp = new RegExp();
+  regExp.message = "some message";
+
+  const errorEvent = new ErrorEvent("type", regExp);
+
+  assert_equals(errorEvent.message, "some message");
+}, "Conversion to a dictionary works");
+
+test(() => {
+  const messageChannel = new MessageChannel();
+  const regExp = new RegExp();
+  regExp[Symbol.iterator] = function* () {
+    yield messageChannel.port1;
+  };
+
+  const messageEvent = new MessageEvent("type", { ports: regExp });
+
+  assert_array_equals(messageEvent.ports, [messageChannel.port1]);
+}, "Conversion to a sequence works");
+
+promise_test(async () => {
+  const regExp = new RegExp();
+
+  const response = new Response(regExp);
+
+  assert_equals(await response.text(), "/(?:)/");
+}, "Can convert a RegExp to a USVString");
+
+test(() => {
+  let functionCalled = false;
+
+  const regExp = new RegExp();
+  regExp.handleEvent = () => {
+    functionCalled = true;
+  };
+
+  self.addEventListener("testevent", regExp);
+  self.dispatchEvent(new Event("testevent"));
+
+  assert_true(functionCalled);
+}, "Can be used as an object implementing a callback interface");